WO2022153007A1 - Optimisation de propriétés physiques et/ou géométriques d'une structure par variations itératives de paramètres de forme - Google Patents
Optimisation de propriétés physiques et/ou géométriques d'une structure par variations itératives de paramètres de forme Download PDFInfo
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Definitions
- the invention relates to the optimization of physical and/or geometric properties of structures comprising substructures separated from each other by spaces.
- structures which comprise P substructures separated from each other by S spaces and each comprising at least one layer of a material, with P ⁇ 2 and S ⁇ 1.
- These structures are each intended to exhibit a chosen response to an electromagnetic excitation chosen by at least one electromagnetic source.
- a structure may be a miniaturized diffraction grating (or meta-grating) responsible for diffracting light according to a predefined deflection angle, or a miniaturized lens (or meta-lens). “metalens”)) responsible for focusing an incident plane wave towards a focal point.
- the gradient g is used to modify the values of the design parameters at each voxel in order to improve the figure of merit.
- the continuous profile is made to converge towards a discrete (final) profile by applying a “blurring” procedure and a “binarization” procedure.
- Blurring consists of applying a low filter in order to gradually smooth the profile, while the binarization procedure consists of gradually pushing the continuous profile, being optimized, towards a discontinuous profile.
- the calculation of the gradient g is carried out in two phases.
- a first phase (known as “direct simulation” (or “forward simulation”)
- the structure being optimized is illuminated, in one sense, by a particular excitation which, for example, can be a polarized plane wave or a point source of the dipole type or even a source line. This amounts to solving Maxwell's equations for a particular geometric configuration and in the presence of a particular excitation.
- Maxwell's equations are solved for the same geometric configuration as before but in the presence of an excitation illuminating the structure being optimization in a direction of propagation opposite to the direction of propagation of the excitation used in the first phase for a structure operating in transmission, or in the same direction for a structure operating in reflection. For example, you can perform backlighting of the structure from the direction in which, or the point (place) from which, you want to optimize the power conveyed by the electromagnetic wave.
- the direct simulation consists in illuminating the structure being optimized along a given incident direction and calculating the transmission coefficient for a structure operating in transmission, or the reflection coefficient for a structure operating in reflection.
- Adjunct simulation consists of reusing the transmission coefficient, or the reflection coefficient depending on the case, calculated by direct simulation to excite the structure along the optimization direction, in the backward (or reverse) direction.
- the direct simulation consists in illuminating the structure to be optimized along a given incident direction, whereas in the adjoining problem, the structure is excited in the retrograde (reverse) direction, using a point source placed at the point where one wishes to focus the incident electromagnetic power.
- the major drawback of the methods described above lies in the fact that they require the use of a high number of voxels for the final structure to offer high performance.
- at least 28 voxels are needed to optimize a one-dimensional (1D) meta-lattice structure, and the larger the dimensions of the structure, the greater the number of voxels required.
- the greater the number of dimensions of the structure (2D or 3D) the greater the number of voxels required.
- the larger and/or more complex the structure the more the methods described above prove to be unsuitable for its optimization.
- the design variables which are the values of the permittivity function are complex numbers.
- the object of the invention is therefore in particular to remedy all or part of the aforementioned drawbacks by acting on the design variables via design parameters which are shape parameters and therefore whose values are always real.
- This method is characterized in that it comprises an optimization step in which a figure of merit is calculated representative of a sensitivity of the chosen response to variations of a first sequence of first design variables and of a second sequence of second design variables of the spaces and substructures, then a gradient of the calculated figure of merit is calculated, then first or second design variables of at least one of the first and second sequences (for example starting with the most sensitive variable of the sequence concerned) as a function of this calculated gradient in order to improve the figure of merit, and the optimization step is repeated with the first and second sequences of modified design variables as long as the figure of merit does not represent a fixed objective and/or the figure of merit is less than a chosen value.
- P+S first design variables of the first sequence and P+S second design variables of the second sequence can be widths of substructure 3 P or of space between substructures defined along one of three different directions of a three-dimensional space.
- the method according to the invention may include other characteristics which may be taken separately or in combination, and in particular:
- first and second sequences of design variables are generated, called initial sequences and each comprising P+S design variables.
- first and second sequences of initial design variables are transformed respectively into a third sequence of P+S third design variables and a fourth sequence of P+S fourth design variables, then one calculates the figure of merit from these P+S third design variables of the third sequence and P+S fourth design variables of the fourth sequence, then in each iteration of the optimization step (after the first) we calculates the figure of merit from the third sequence of P+S new design variables resulting from transformations of the first sequence of the P+S first design variables determined during the previous optimization step and from the fourth sequence of P+S new fourth design variables determined during the preceding optimization step, and each of said third design variables of the third sequences and P+S fourth design variables of the fourth sequences materializes a position of substructure or space between substructures relative to an origin and along the direction of the three-dimensional space along which the width is defined, each of said third design variables of the third sequences and P+S fourth design variables of the fourth
- each optimization step it is possible to calculate, in an optimization sub-step of at most P+S sub-iterations, a sequence of at most P+S sensitivity parameters depending respectively on the gradient of the figure of deserves, then one can calculate iteratively at each of the P+S sub-iterations a pair of fifth variables from respectively the P+S third design variables of the third sequence, the P+S corresponding sensitivity parameters, and at least minus one chosen constraint, starting with the third design variable with the strongest sensitivity in the third sequence (i.e.
- each constraint can, for example, be chosen from a group comprising a minimum width and a maximum width
- the figure of merit can be calculated from forward and deputy simulations using the corresponding third design variable, and either from a direct simulation using the fourth design variable corresponding during the first optimization step, or the corresponding new fourth design variable generated during the previous optimization step;
- an electromagnetic source constituting a dipole or a line source or a plane wave (polarized or not) or even a guided mode of a waveguide can be used;
- the structure can have a geometry having a periodicity in at least one of three different directions of a three-dimensional space.
- the structure can have a geometry made of a (random or controlled) arrangement of substructures and space(s) between substructures forming at least one discrete elementary pattern and having a canonical form which is chosen from a group comprising a line, a rectangle, a cylinder, a sphere, a parallelepiped, a crown, and a set of concentric or off-center crowns;
- the structure may have a geometry devoid of periodicity in a three-dimensional space; - the P+S first design variables of the first sequence and P+S second design variables of the second sequence can be initially generated randomly;
- the electromagnetic source can be located outside or inside the the structure ;
- each of the first design variables of the first sequence and second design variables of the second sequence may be a function (or may not be a function) of a wavelength of an electromagnetic field generated by the electromagnetic source;
- the electromagnetic source can generate an electromagnetic field which is a function of at least one spatial variable.
- the invention also proposes a computer program product comprising a set of instructions which, when it is executed by processing means, is capable of implementing a method of the type of that presented above for optimizing a structure comprising P substructures separated from each other by S spaces and each comprising at least one layer of a material, with P ⁇ 2 and S ⁇ 1 , so that this structure exhibits a chosen response to an electromagnetic excitation chosen by at least one source electromagnetic.
- the invention also proposes a device to allow the optimization, with a view to its production, of a structure comprising P substructures separated from each other by S spaces and each comprising at least one layer of a material, with P ⁇ 2 and S ⁇ 1 , so that this structure exhibits a selected response to a selected electromagnetic excitation by at least one electromagnetic source.
- This device is characterized in that it comprises at least one processor and at least one memory arranged to perform the optimization operations consisting in calculating a figure of merit representative of a sensitivity of the chosen response to variations of a first sequence of first design variables and of a second sequence of second design variables of the spaces and substructures, then in calculating a gradient of the calculated figure of merit, then in modifying (for example progressively and successively) first or second design variables of at least one of the first and second sequences (for example starting with the most sensitive variable of the sequence concerned) as a function of this calculated gradient in order to improve the figure of merit, and to reiterate these calculations and modifications with the first and second sequences of modified design variables as long as the figure of merit does not represent a fixed objective and/or the figure of merit is less than a chosen value.
- the invention also proposes an electronic device comprising a device of the type presented above.
- FIG. 1 schematically illustrates an example of a structure defining a 1D meta-lattice deflecting by an angle 6d a plane wave normal to its front face
- FIG. 2 schematically illustrates an example of a structure defining a meta-lens focusing a plane wave normal to its front face
- FIG. 3 schematically and functionally illustrates an embodiment of a computer comprising an optimization device according to the invention
- FIG. 4 schematically illustrates an example of an algorithm implementing an optimization method according to the invention
- FIG. 5 schematically illustrates part of an example of a structure with the materialization of the widths of its substructures and spaces and the positions of the edges of these substructures
- FIG. 6 schematically illustrates part of an example of updating the positions of the edges of the substructures of a structure during an iteration of the optimization step of the optimization method according to the invention
- FIG. 7 schematically illustrates an example of a structure being optimized with materialization, on the left, of an electromagnetic source of the electric dipole type for the direct simulations, and, on the right, of an electromagnetic source of the plane wave type for the simulations assistants, and
- FIG. 8 schematically illustrates an example of breakdown into functional blocks of an optimization device according to the invention. Detailed description of the invention
- the aim of the invention is in particular to propose a method for optimizing physical and/or geometric (topological) parameters, or more clearly a method (100-230) for producing a structure comprising such optimization steps, as well as an associated device (in particular allowing optimization) 1, intended to allow the determination of structures 2, each comprising substructures 3 P (or 3) separated from each other by spaces 4 S (or 4), and each having a chosen response to an electromagnetic excitation chosen by at least one electromagnetic source 9 or 10.
- the structures 2 subject to optimization according to the invention are intended to form part of devices or equipment in the field of photonics.
- These structures define, for example, miniaturized gratings (or meta-gratings) responsible for diffracting light according to predefined deflection angles (as illustrated without limitation in [Fig. 1]), or miniaturized lenses (or meta-lenses) charged to focus incident plane waves towards predefined focusing points (as illustrated without limitation in [Fig. 2]).
- the invention is not limited to structures 2 in the field of photonics. It concerns other technical fields, and in particular those of optics and plasmonics.
- the invention relates to any type of structure 2 comprising P substructures 3 P (or 3) separated from each other by S spaces 4 S (or 4) and each comprising at least one layer of a material, with P ⁇ 2 and S ⁇ 1, and having to present a chosen response to an electromagnetic excitation chosen by at least one electromagnetic source 9 or 10.
- the 3 P substructures which are located at the opposite ends of a structure 2 can also be preceded (or surrounded) by an additional space which may be taken into account in the calculations.
- the invention proposes in particular a method (100-230) intended to allow the optimization of structures 2, of the type of those defined in the previous paragraph.
- Such an optimization method (100-230) can be implemented by means of an optimization device 1, according to the invention, comprising at least one processor 6, for example of digital signal (or DSP (“Digital Signal Processor”)), and at least one memory 7, as illustrated without limitation in [FIG. 3].
- This processor 6 and this memory 7 preferably form part of a computer 8, as illustrated without limitation in [Fig. 3].
- This computer 8 can be made in the form of a combination of electrical or electronic circuits or components (or “hardware”) and software modules (or “software”). It will be noted that this calculator 8 can be an electronic device or else can be part of an electronic device, such as for example a computer (fixed or portable).
- the memory 7 is live in order to store instructions for the implementation by the processor 6 of at least part of the optimization method with a view to an achievement (100-230) described below (and therefore to ensure its functions ).
- the processor 6 can comprise integrated (or printed) circuits, or else several integrated (or printed) circuits connected by wired or wireless connections.
- integrated (or printed) circuit is meant any type of device capable of performing at least one electrical or electronic operation.
- each 3P substructure comprises at least one layer of a material.
- 3P substructures include only one layer of material, but they could have at least two layers of material.
- the structure 2 must present a chosen response to an electromagnetic excitation chosen by at least one electromagnetic source 9 or 10. It will be noted that the structure 2 to be optimized can have a geometry having a periodicity in at least one of three different directions (X, Y, Z) of three-dimensional space.
- the structure 2 to be optimized can have a geometry made up of an arrangement, random or controlled, of 3 P substructures and of 4 S space(s) between 3 P substructures which forms at least one pattern discrete element and which has a canonical shape chosen, for example, from a group comprising a line, a rectangle, a cylinder, a sphere, a parallelepiped, a crown, and a set of concentric or off-center crowns.
- the 3 P substructures are lines (or in English “ridges”) having a rectangular transverse section in a plane XZ.
- the structure 2 to be optimized can have a geometry devoid of periodicity in three-dimensional space (X, Y, Z).
- the (100-230) comprises an optimization step 110-230 in which one (the device 1) begins by calculating, for a structure 2, a figure of merit (or quality) FM which is representative of a sensitivity of the chosen response of this structure 2 to variations of a first sequence of first design variables and of a second sequence of second design variables 4 S spaces and 3 P substructures.
- the device 1 begins by calculating, for a structure 2, a figure of merit (or quality) FM which is representative of a sensitivity of the chosen response of this structure 2 to variations of a first sequence of first design variables and of a second sequence of second design variables 4 S spaces and 3 P substructures.
- the first and second design variables can represent respectively old and new widths of the substructures 3 P and spaces 4 S .
- the X direction is the direction along which the width ek of each 3 P substructure or 4 S space is determined, the Xk represent the positions of the edges (or limits) of the 3 P substructures, and the ⁇ represent the permittivities of the 3 P substructures.
- a design variable of a 2 structure can be a geometric (or dimensional) variable of a 3 P substructure or of a 4 S space or else a physical variable of a 3 P substructure (such as for example the constitution of a layer of material or a permittivity or a refractive index or a conductivity or even a chemical potential controlling the conductivity of a tunable material in real time).
- the optimization step 110-230 of the method continues with the calculation (by the device 1) of a gradient g (t) (x i ) of the figure of merit FM which has just been calculated (g(x)
- the optimization step 110-230 of the method continues with the modification (by the device 1) of the first or second design variables of at least one of the first and second sequences as a function of this gradient g (t) (x i ) which has just been calculated, in order to improve the figure of merit FM. Then, one (the device 1) repeats the optimization step 110-230 with the first and second sequences of modified design variables as long as the figure of merit FM does not represent a fixed objective and/or the figure of merit FM is less than a chosen value.
- each optimization step 110-230 including the first
- the first design variables are modified according to the gradient g (t) (x i ) just calculated.
- the second design variables initials are modified during the very first optimization step 110-230, then fourth design variables are modified according to the gradient g (t) ( ) x i which has just been calculated, during the following optimization steps 110-230.
- E(r) is the electric vector field at an observation point r, created by at least one electromagnetic source 9 or 10 located at a point r′.
- the gradient of the figure of merit FM can be defined by the relation: and neglecting the second-order terms, we show that where the symbol ".” denotes the dot product of two vectors and the overline denotes the complex conjugate.
- ⁇ E(r) of the electric vector field E(r) at the observation point
- the local variation around a point r′ k of the design domain of the figure of merit FM is proportional to the variation of the electrical induction D multiplied by the assistant field.
- each sub-interval l k can be associated with a sensitivity parameter g which can, for example, be defined at from by:
- This sensitivity parameter is associated with a shape parameter or in English “fitness”)
- a shape parameter or in English “fitness” We will understand later the usefulness of this shape or aptitude parameter.
- the method (100-230) can comprise an initialization step 100 before the very first optimization step 10-230.
- this initialization step 100 one (device 1) generates a first sequence of P+S first design variables and a second sequence of P+S second design variables. These first and second sequences of design variables are called initial sequences.
- these first P+S and second P+S can be initially generated in a way random during the initialization step 100 by the device 1 . But this is not mandatory. Indeed, we can consider that it is the person who supervises the optimization who defines the P+S first e and P+S second initial design variables.
- the P+S first design variables form a first (P+S)-tuple (or first sequence) and the P+S second design variables form a second (P+S)-tuple (or second sequence) in the interval [e min , e max ], where e min is the minimum width allowed at the initialization step for a 3P substructure or a 4S space and emax is the maximum width allowed at l initialization step for a 3 P substructure or a 4 S space.
- e min is the minimum width allowed at the initialization step for a 3P substructure or a 4S space
- emax is the maximum width allowed at l initialization step for a 3 P substructure or a 4 S space.
- the first optimization step 110-230 is started in which one (the device 1) transforms the first and second sequences of initial design variables respectively into a third sequence of P+S third design variables initials and fourth sequence of P+S fourth design variables initials.
- each of the third P+S and P+S fourth design variables can materialize a position of 3P or 4S space substructure between 3P substructures with respect to an origin and along the X direction of three-dimensional space (X, Y, Z), along which the width ek is defined , as shown in [Figs. 5] and [Fig. 6].
- the width ek is an assistant variable which restricts the space of the design phase of structure 2 by fixing the positions of the substructures 3 P and the spaces 4 S .
- a materialized position can be an edge (or a boundary) or a center of a 3P substructure or a 4S space.
- each position of an edge can be equal to the sum between the previous position x and the first or second corresponding design variable.
- these new variables Xk make it easier to obtain a fine agreement between the thicknesses ek and the positions of the 3 P substructures during the optimization phase.
- one the device 1) can calculate the figure of merit FM from the third sequence of P+S new third design variables and P+S fourth design variables of the fourth sequence.
- one can calculate the figure of merit FM from the third sequence of P+S new third design variables resulting from transformations of the first sequence of P+S first design variables determined during the previous optimization step 110-230 and the fourth sequence of P+S new fourth design variables determined during the previous optimization step 110-230.
- each optimization step 110-230 one (the device 1) can calculate P+S sensitivity parameters which are a function respectively of the P+S component gs (t) (x i ) of the gradient of the figure of merit FM.
- one (the device 1) can then carry out in each optimization step at most P+S sub-iterations in each of which one (the device 1) can calculate iteratively, a pair of fifth variables starting respectively from the third sequence of P+S third design variables corresponding P+S sensitivity parameters, and at least one chosen constraint, preferably starting with the third design variable of the third sequence which is the most sensitive, i.e. the one whose value of has the highest sensitivity, and ending with the one with the lowest sensitivity.
- each constraint can be chosen from a group including the minimum width e min and the maximum width e max-
- the classification of the design variables in each sequence, according to their sensitivities, is made from the values of the gradient function of the figure of merit FM.
- the values taken by the sequence of sensitivity parameters can be sorted in descending (or ascending) order and used to search for the position of each edge (or limit) position variable X k which makes it possible to improve the figure of merit FM.
- every fifth variable in a sequence can be given by the relation: and every fifth variable in a sequence can be given by the relationship :
- this decreasing parameter can be defined by the relation: where tmax represents the maximum number of iterations t of the optimization step 110-230, and ao is a numerical control parameter fixed at the first iteration of the optimization step 110-230.
- one can determine among each pair of fifth variables and the third design variable from which they are calculated, the best of these two fifth variables and third design variable depending on a chosen criterion.
- Each fitness or ability parameter calculated from the parameter of sensitivity is therefore used at each sub-iteration to disturb the current value of edge position variable (or limit) corresponding taking into account at least one minimum width constraint Cmin (imposed by the manufacturing technique of the structure), which can induce a possible variation (increase or decrease) of this disturbed value.
- Only the variation leading to the best improvement of the figure of merit FM (this is the aforementioned chosen criterion here) is retained to define later the new value of the edge position variable (or limit) considered.
- the determination of each variation leading to the best improvement of the figure of merit FM can be carried out by means of a simulation.
- the minimum width Cmin can be different from e min .
- emin and emax are used initially during the generation of the initial conditions, while Cmin is a minimum constraint which is imposed and taken into account during the optimization independently of the value of e min .
- the third sequence of third variables is updated (by the device 1) by replacing in this third sequence the element which is considered the best among the two fifths variables and the element of the third sequence used to calculate them.
- one (the device 1) can constitute a new fourth sequence with the fully updated third sequence.
- each new fourth design variable is given by the relation: Then, one (device 1) can calculate (update) a new second sequence of P+S second design variables , each from two elements of the new fourth sequence of P+S fourth design variables . In other words, when the best set of new fourth design variables has been determined, a new sequence of widths of 3 P substructures and 4 S spaces is calculated. To do this, we use the relation mentioned above:
- device 1 can generate P+S new first design variables from respectively P+S new second corresponding design variables and P+S parameters corresponding noise. This can be done, for example, by applying random oscillations to the best set of new second design variables by means of a contraction or expansion mechanism random.
- ⁇ 0 is a parameter making it possible to fine tune the widths of the sub- 3 P structures and 4 S spaces between 3 P substructures so that the disturbance induced does not modify the values of
- p is an adjustable numeric parameter, for example equal to 10.
- one can calculate a new third sequence of P+S new third design variables from the new P+S first design variables of the new first sequence of P+S to use it during the following iteration (t+1).
- each optimization step 110-230 subsequent to the first optimization step 110-230 uses as at most P+S fourth design variables the at most P+S new fourth variables that were generated during the previous optimization step 110-230.
- one (device 1) uses as at most P+S third design variables at most P+S new third variables resulting respectively from transformations of the P+S new first design variables generated during the previous optimization step 110-230, as long as the figure of merit FM does not represent a fixed objective and/or the figure of merit FM is less than a chosen value.
- we update the previous structure 2 then we perform a new iteration as long as we have not converged on an optimal final structure 2 and the maximum number of iterations of step d 110-230 optimization has not yet been achieved.
- each optimization step 110-230 one (the device 1) can calculate the figure of merit FM from direct and adjoint simulations using the corresponding third design variable, and either from a direct simulation using the fourth design variable corresponding during the first optimization step 110-230, either of the new fourth design variable corresponding generated during the previous optimization step 110-230. Since the direct and conjoint simulations are well known to those skilled in the art, they will not be described below. One can simply say that in each direct simulation and in each assistant simulation one can use an electromagnetic source constituting a dipole, a line source, a plane wave or a guided mode of a waveguide.
- one (the device 1) can, for example, use an electromagnetic source 9 constituting a dipole (as illustrated schematically in the left part of [FIG. 7]), and in each simulation added on (the device 1) can, for example, use an electromagnetic source 10 generating plane waves (as illustrated schematically in the right part of [Fig. 7]).
- an electromagnetic source 9 or 10 of the dipole or source line type can be located outside or inside the structure 2.
- each of the first design variables of the first sequence and the second design variables of the second sequence can be a function of a wavelength of the electromagnetic field which is generated by the electromagnetic source. But alternatively each of the first and second Design variables can be independent of a wavelength of the electromagnetic field that is generated by the electromagnetic source.
- the electromagnetic source 9 or 10 can generate an electromagnetic field which is a function of at least one spatial variable. But it doesn't have to.
- a structure 2 constituting a 1D diffraction meta-grating similar to that illustrated in [FIG. 1] and comprising linear 3 P substructures (bars) in silicon, having a refractive index equal to 3.6082, a height (along Z) equal to 650 nm, and deposited on an S 1 O 2 substrate having a refractive index equal to 1.45, with a manufacturing constraint relating to the minimum width (Cmin) equal to 50 nm.
- This structure 2 is intended to deflect electromagnetic waves having a wavelength equal to 0.9 ⁇ m according to a deflection angle ⁇ d equal to 40°.
- This algorithm comprises an optional initialization step 100 in which a first sequence of P+S first design variables is generated initial and a second sequence of P+S second initial design variables. Then, a first optimization step 110-230 is started. The latter begins with sub-steps 110 and 120 in which the first and second sequences of initial design variables are respectively transformed into a third sequence of P+S third design variables initial and fourth sequence of P+S fourth design variables ) initial.
- sub-steps 130 and 140 direct and conjoint simulations are respectively carried out using the current and corresponding third design variable, and a direct simulation using the fourth common design variable and corresponding, to calculate a figure of merit FM.
- a sub-step 150 the gradient g (t) (x i ) of the figure of merit FM is calculated.
- P+S sensitivity parameters are calculated which are a function respectively of the P+S components g (t) (x i ) of the gradient of the figure of merit FM.
- a sub-step 170 at most P+S sub-iterations are performed, in each of which a pair of fifth variables is calculated iteratively, starting respectively from the third sequence P+S third P+S design variables corresponding sensitivity parameters, and at least one constraint chosen.
- a sub-step 180 in each sub-iteration of iteration t, one determines among each pair of fifth variables and the third design variable from which they are calculated, the best of these two fifth variables and third design variable depending on a chosen criterion. This last can consist of each variation leading to the best improvement of the figure of merit FM.
- the third sequence of third variables is updated by replacing in this third sequence the element considered to be the best among the two fifth variables and the element of the third sequence used to calculate them.
- a new fourth sequence is formed with the updated third sequence.
- a new second sequence of P+S second design variables or , each from two elements of the new fourth sequence fourth design variables
- P+S noise parameters are determined corresponding respectively to the P+S new second design variables which have just been calculated.
- P+S new first design variables are generated respectively from the new P+S second design variables corresponding values and corresponding P+S noise parameters.
- each optimization step 110-230 and/or the initialization step 100 of the method (100-230) can be performed by different components.
- the method (100-230) can be implemented by a plurality of digital signal processors, random access memory, mass memory, input interface, output interface.
- the invention also proposes a computer program product (or computer program) comprising a set of instructions which, when it is executed by processing means of the electronic circuit (or hardware) type, such as for example the processor 6 is capable of implementing the method (100-230) described above.
- device 1 can be broken down into five functional blocks.
- a first functional block 10 performs the initialization step 100 (optional).
- a second functional block 11 ensures the transformations of the P+S first design variables respectively into P+S third design variables during each step optimization 110-230, and the transformation of the P+S second initial design variables respectively in P+S fourth design variables in the very first step optimization 110-230.
- a third functional block 12 is responsible for performing all the direct and conjoint simulations during each optimization step 110-230.
- a fourth functional block 13 is responsible for performing the calculations of the gradient g (t) (x i ) of the figure of merit FM, of the form or ability parameters and of the fifth variables during each optimization step 110-230.
- a fifth functional block 14 is responsible for determining the new fourth design variables the new second design variables noise parameters and new first design variables during each optimization step 110-230.
- modal method can, for example, be used to solve Maxwell's equations, namely the Fourier modal method (or FMM (“Fourier Modal Method”)), the RCWA method (“ Rigorous Coupled-Wave Analysis” and a polynomial modal method (or PMM (“Polynomial Modal Method”)).
- FMM Fourier Modal Method
- RCWA Rigorous Coupled-Wave Analysis
- PMM Polynomial Modal Method
- aperiodic Fourier modal method or AFMM (“Aperiodic Fourier Modal Method”)
- PMMs Perfectly Matched Layers
- AFMM Aperiodic Fourier Modal Method
- the computer 8 can also include, in addition to the device 1 (random access memory 7 and processor 6), a mass memory 15. Furthermore, this computer 8 can also include an input interface 16 for the reception of instructions and data, to use them in calculations or processing, possibly after having formatted and/or demodulated and/or amplified them, in a manner known per se, by means of a digital signal processor 17. In addition , this computer 8 can also comprise an output interface 18, in particular for delivering messages and the results of each optimization.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US18/261,255 US20240061973A1 (en) | 2021-01-13 | 2022-01-13 | Optimisation of physical and/or geometric properties of a structure through iterative variation of shape parameters |
JP2023565646A JP2024508560A (ja) | 2021-01-13 | 2022-01-13 | 形状パラメータの反復変動による構造の物理的及び/又は幾何学的特性の最適化 |
EP22702763.8A EP4278293A1 (fr) | 2021-01-13 | 2022-01-13 | Optimisation de propriétés physiques et/ou géométriques d'une structure par variations itératives de paramètres de forme |
KR1020237027135A KR20230156027A (ko) | 2021-01-13 | 2022-01-13 | 형상 파라미터의 반복적인 변동을 통한 구조체의 물리적및/또는 기하학적 속성의 최적화 |
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FRFR2100307 | 2021-01-13 | ||
FR2100307A FR3118814B1 (fr) | 2021-01-13 | 2021-01-13 | Optimisation topologique de propriétés physiques et/ou géométriques d’une structure par variations itératives de paramètres de forme |
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WO2022153007A1 true WO2022153007A1 (fr) | 2022-07-21 |
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US (1) | US20240061973A1 (fr) |
EP (1) | EP4278293A1 (fr) |
JP (1) | JP2024508560A (fr) |
KR (1) | KR20230156027A (fr) |
FR (1) | FR3118814B1 (fr) |
WO (1) | WO2022153007A1 (fr) |
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CN117273115B (zh) * | 2023-11-24 | 2024-03-29 | 上海燧原科技股份有限公司 | 一种反向计算图的静态生成方法、装置、设备及介质 |
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2021
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2022
- 2022-01-13 EP EP22702763.8A patent/EP4278293A1/fr active Pending
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- 2022-01-13 JP JP2023565646A patent/JP2024508560A/ja active Pending
- 2022-01-13 US US18/261,255 patent/US20240061973A1/en active Pending
- 2022-01-13 WO PCT/FR2022/050065 patent/WO2022153007A1/fr active Application Filing
Non-Patent Citations (2)
Title |
---|
MINGKUN CHEN ET AL: "Design space reparameterization enforces hard geometric constraints in inverse-designed nanophotonic devices", ARXIV.ORG, 25 July 2020 (2020-07-25), pages 1 - 14, XP081727227 * |
PHAN THAIBAO ET AL: "High-efficiency, large-area, topology-optimized metasurfaces", LIGHT: SCIENCE & APPLICATIONS, vol. 8, no. 1, 1 December 2019 (2019-12-01), pages 2047 - 7538, XP055846290, DOI: 10.1038/s41377-019-0159-5 * |
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FR3118814B1 (fr) | 2024-01-05 |
JP2024508560A (ja) | 2024-02-27 |
KR20230156027A (ko) | 2023-11-13 |
EP4278293A1 (fr) | 2023-11-22 |
FR3118814A1 (fr) | 2022-07-15 |
US20240061973A1 (en) | 2024-02-22 |
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