CN102237258B - Broadband spatial coherence thermal radiation light source - Google Patents
Broadband spatial coherence thermal radiation light source Download PDFInfo
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- CN102237258B CN102237258B CN 201010169422 CN201010169422A CN102237258B CN 102237258 B CN102237258 B CN 102237258B CN 201010169422 CN201010169422 CN 201010169422 CN 201010169422 A CN201010169422 A CN 201010169422A CN 102237258 B CN102237258 B CN 102237258B
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Abstract
The invention relates to a broadband spatial coherence thermal radiation light source, comprising a metal structure layer, a medium layer and a lower base plate metal layer, wherein the lower base plate metal layer is a supporting layer and a thermal conductive layer, and the medium layer and the planar metal structure layer are sequentially overlapped on the lower base plate metal layer from down to up. The metal structure layer is composed of one-dimensional or two-dimensional arrays arranged in a metal unit period, a low-leakage coherent magnetic resonance surface state formed by the metal structure layer, the medium layer and the lower base plate metal layer in the invention controls coherence of thermal radiation, and the frequency can be adjusted by cycle length. And the coherent magnetic resonance surface state in the invention is leaked to a free space by virtue of a metal slot on the upper surface, thus the ratio of width of the metal slot to a period determines coherence length. The broadband spatial coherence thermal radiation light source provided by the invention has simple structure and low cost, is convenient to manufacture and is easy to realize.
Description
Technical field
The present invention relates to a kind ofly for Terahertz, infrared frequency range has the heat radiation light source of high spatial coherence.
Background technology
Material is because the spontaneous radiation that the warm-up movement of molecule or atom etc. produces is referred to as thermal radiation, and its transmitted spectrum is relevant with temperature with material character.All objects are all in continuous thermal radiation, and the most general application of thermal radiation is exactly incandescent lamp.Compare with high directionality with laser monochromaticjty, people it is generally acknowledged that thermal radiation all is incoherent thermal source on time and space, and reaching transmitted spectrum is suitable broadband, and the radiation of all directions is isotropism.The light source of generally using in the spectrum analysis is monochromatic light, and infrared laser light source can produce relevant monochromatic light, but it involves great expense, and frequency is generally untunable.Therefore general using grating or prism carry out light splitting to thermal radiation light and obtain monochromatic light.But the method complex structure, cost is expensive, is unfavorable for miniaturization, and monochromaticjty also is subjected to the restriction of grating beam splitting.
Thermal-radiating spatial coherence can utilize surface of metal material or semiconductor material surface etc. to control from the polariton pattern.2002, the people such as J.-J.Greffet publish thesis at Nature Journal and point out, carve one deck grating by the surface at carborundum, can be to have coherence's surface etc. from polariton pattern and outfield coupling, make carborundum produce high directed thermal radiation pattern, thereby realize the immediately coherent radiation of thermal source.But its plasma oscillation frequency of metal material that nature exists is all in ultraviolet, and visible light wave range also has the plasma oscillation frequency of minority semi-conducting material at near-infrared, can not realize the relevant thermal radiation of optional frequency.
The present invention utilizes a kind of planar ultra-thin structure to realize the relevant surface state of magnetic resonance, forms a low magnetic surface that leaks etc. on the surface from the polariton pattern, thereby realizes wide band relevant heat radiation light source.The radiation direction angle of different frequency is different, thereby guarantees monochromaticjty and the high directivity of light source.Can obtain the monochromatic optical wave of different frequency by the angle of rotating light source.The coherence can control by physical dimension.
Summary of the invention
The purpose of this invention is to provide a kind of broadband spatial coherence thermal radiation light source, utilize plane, superthin structure to obtain the thermal-radiating light source of coherence.With existing semi-conducting material, perhaps the coherent source of metal material surface optical grating construction realization is compared, and the thermal radiation electromagnetic wave phase dryness of light source of the present invention is controlled, can reach 220 times more than the wavelength; Working band is adjustable, can be used for realizing Terahertz, infrared monochromatic high directivity coherent source.
The present invention need to comprise planar metallic structure layer, dielectric layer and lower shoe metal level, and the lower shoe metal level is as supporting layer and the heat conduction layer of total, and dielectric layer and plane structured metal layer are stacked in above the lower shoe metal level from lower to upper successively.
Planar metallic structure layer of the present invention is comprised of one dimension or the two-dimensional array of metal unit periodic arrangement, cycle is approximately the wavelength of electromagnetic wave in medium of band edge on the working band, therefore working band can be regulated by the dielectric constant of cycle and medium, covers whole Terahertz, infrared band.Metal unit can be that metal is rectangular, also can be metal square, metal pane, metal disk or metal ring etc.Because operating frequency is infrared, terahertz wave band, metal shows as desired metallic, so metal unit can be any metal.This planar structure can be finished through techniques such as photoetching with metallic film.Thermal-radiating spatial coherence is by regulating the coupling coefficient control of light wave and plane wave, coupling coefficient is by the decision of the air gap between the metal unit, and the present invention takes little air gap (less than the cycle 1/5th) to obtain high spatial coherence thermal radiation light wave.
Lower shoe metal level of the present invention can heat by modes such as heating wire, and temperature conduction is to dielectric layer.Lower shoe metal level and plane structured metal layer are metal, very weak at Terahertz, infrared band thermal radiation capability, but the relevant surface state energy of the height that structured metal layer, dielectric layer and lower shoe metal level are supported amplification medium layer electromagnetic field, thereby the thermoradiation efficiency of amplification medium can reach the black body radiation level in theory.Dielectric layer has the small electric conductance, can be by semi-conducting material, and perhaps generic media (for example silica material) is mixed trace (about 1%) carbon black or metal nanoparticle realization.
Thermal radiation light wave of the present invention different frequency in working band has different radiation direction angles, can obtain monochromatic high directional heat radiation light-wave by rotary sample.
Owing to having adopted such scheme, the present invention has following characteristics:
1, since the present invention by the upper surface structured metal layer, the relevant magnetic resonance surface state of the low leakage that dielectric layer and lower shoe metal level consist of is controlled thermal-radiating coherence, when probably being 0.5～1.5 times of structured metal layer cycle, the wavelength in the medium produces relevant thermal radiation, therefore frequency can be regulated by Cycle Length, cycle, larger frequency was lower, on the contrary, more small frequency is lower the cycle.
2, because the metal slit of relevant magnetic resonance surface state of the present invention by upper surface leaks into free space, so the size of metal slit width and periodic ratio determined the size of coherence length, and this ratio is less, and coherence length is larger.Therefore frequency and coherence length can the structural parameters regulation and control.Frequency coverage Terahertz and infrared band, coherence length can reach 220 times of wavelength.
3, because the magnetic resonance of the used structure generation of the present invention local electromagnetic field field intensity in the amplified medium layer greatly, therefore can the Effective Regulation local density of state, can make the thermal radiation of realizing ideal of radiation efficiency is very low in the specific frequency spectrum scope conventional media plate, efficient can reach the radiation efficiency of ideal black-body.
4, thermal radiation deflection of the present invention is by wavelength control, and the thermal radiation deflection of different wave length is different, can be used for realizing Terahertz and infrared relevant heat radiation light source.
5, the used structure of the present invention is planar structure, makes simple, with low cost.
6, the used structural thickness of the present invention is sub-wavelength thickness, is easy to integrated.
Description of drawings
Figure 1A is the structural representation of the embodiment of the invention.
Figure 1B is the structured metal layer schematic diagram of the embodiment of the invention.
Fig. 2 is the absorption spectra schematic diagram of embodiment of the invention different angles.
Fig. 3 is that the embodiment of the invention is at the angle absorption spectra schematic diagram of different frequency.
Fig. 4 is the relevant thermal radiation directional diagram (40.0THz) of Finite-Difference Time-Domain Method emulation of the present invention.
Fig. 5 is the relevant thermal radiation directional diagram (53.5THz) of Finite-Difference Time-Domain Method emulation of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawing illustrated embodiment.
Embodiment:
The embodiment of the invention is the thermal radiation slab construction of design at 30-60THz.Its structural representation as shown in Figure 1, wherein upper surface structured metal layer 1 adopts the one-dimensional metal optical grating construction of periodic arrangement, is that 0.2 micron aluminium film photoetching forms by thickness.The rectangular width of metal is 4 microns, and the rectangular and rectangular spacing of metal of metal is 0.2 micron.Uniform dielectric layer 2 adopts doped silicon oxide material.Pure silicon oxide dielectric constant is low, and light absorption is very little, and radiation efficiency is low; 1% carbon dust that mixes can increase its conductivity in the situation that keep its dielectric constant constant, and the silica material conductivity that the present embodiment is used is 67s/m.Lower shoe is metal level 3, produces magnetic resonance surface coherent states with upper surface structured metal layer 1 and dielectric layer 2, also plays the effect of supporting total.
Single dielectric layer radiation efficiency is very low, upper surface structured metal layer of the present invention, dielectric layer and lower shoe metal level can produce relevant surface state, greatly strengthen its radiation efficiency, Fig. 2 is the incident light absorption spectra of the corresponding different angles of the embodiment of the invention, can see when light positive incides this structure, in the 54.3THz frequency a high absworption peak is arranged, according to Kirchhoff's law, the high object that absorbs also is the high-heating radiation object simultaneously, therefore this structure radiation efficiency of amplified medium layer greatly is to the thermal radiation level of ideal black-body.Simultaneously this absworption peak is very sensitive to the angle of incident light, Fig. 3 be the embodiment of the invention at 40THz, angle absorption spectra in the time of 54.3THz, this absworption peak angle halfwidth of reflection is rather narrow among the figure, that is to say that this absworption peak has high spatial coherence.Spatial coherence can be controlled by gap size, work as hold period, in the constant situation of the structural parameters such as thickness, when the size of metal slit becomes 0.1 micron by 0.2 micron, be reduced to 1.1 degree at the absworption peak halfwidth of the infrared angle of 40THz absorption spectra about 30 degree by 2.7 original degree, the coherence is increased to 52 times of wavelength by 21 times of original wavelength.
Fig. 4 and Fig. 5 are the thermal radiation directional diagram of the embodiment of the invention of Calculation Simulation, compare with the ordinary hot radiating light source, its thermal radiation directional diagram at 40THz and 54.3THz has high directivity, namely has high spatial coherence, and the radiation direction angle of different frequency is also different, therefore its structure is as infrared, and the terahertz wave band light source has high spatial coherence and monochromaticjty.
Broadband spatial coherence thermal radiation light source of the present invention, its thermal-radiating spatial coherence can reach 220 times of wavelength, can realize the high efficiency spatial coherence thermal radiation of broad frequency range, the radiation direction of light wave is very sensitive to wavelength, can be used for realizing Terahertz, the spatial coherence light source of infrared band, planar structure, thickness ultrathin, handling ease, with low cost.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (5)
1. broadband spatial coherence thermal radiation light source, it is characterized in that: it comprises planar metallic structure layer, dielectric layer and lower shoe metal level, the lower shoe metal level is supporting layer and heat conduction layer, and dielectric layer and plane structured metal layer are stacked in above the lower shoe metal level from lower to upper successively;
Described planar metallic structure layer is comprised of one dimension or the two-dimensional array of metal unit periodic arrangement;
Air gap between the described metal unit is less than 1/5th of the cycle.
2. broadband spatial coherence thermal radiation light source as claimed in claim 1, it is characterized in that: described metal unit is that metal is rectangular.
3. broadband spatial coherence thermal radiation light source as claimed in claim 1, it is characterized in that: described metal unit is metal square, metal pane, metal disk or metal ring.
4. broadband spatial coherence thermal radiation light source as claimed in claim 1, it is characterized in that: described dielectric layer has the small electric conductance.
5. broadband spatial coherence thermal radiation light source as claimed in claim 4, it is characterized in that: described dielectric layer is semi-conducting material, or generic media is mixed micro-carbon black or metal nanoparticle.
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| CN106371263B (en) * | 2016-12-08 | 2019-05-14 | 中国科学院光电技术研究所 | A kind of heat radiation infrared beams regulation device based on super surface |
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| CN101153940A (en) * | 2006-09-29 | 2008-04-02 | 南京理工大学 | Three-dimensional laminated photon crystal implementing thermal radiation optical spectrum control |
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| CN101153940A (en) * | 2006-09-29 | 2008-04-02 | 南京理工大学 | Three-dimensional laminated photon crystal implementing thermal radiation optical spectrum control |
Non-Patent Citations (2)
| Title |
|---|
| Coupling between surface plasmons via thermal emission of a dielectric layer sandwiched between two metal periodic layers;Ming-Wei Tsai,etal;《APPLIED PHYSICS LETTERS》;20071120;第91卷(第21期);213104 * |
| Ming-Wei Tsai,etal.Coupling between surface plasmons via thermal emission of a dielectric layer sandwiched between two metal periodic layers.《APPLIED PHYSICS LETTERS》.2007,第91卷(第21期),213104. |
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