CN1693930A - High-diffraction efficiency quartz transmission grating of 632.8 nano wavelength - Google Patents
High-diffraction efficiency quartz transmission grating of 632.8 nano wavelength Download PDFInfo
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- CN1693930A CN1693930A CN 200510026559 CN200510026559A CN1693930A CN 1693930 A CN1693930 A CN 1693930A CN 200510026559 CN200510026559 CN 200510026559 CN 200510026559 A CN200510026559 A CN 200510026559A CN 1693930 A CN1693930 A CN 1693930A
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Abstract
A quartz transmission grating of high efficiency of diffraction is a high density, rectangle quartz grating of deep eclipse. The grating wave-length is 632.8 nms and its line density 1575-1630 lines/ millimeter. Its depth is 1.1-1.3 micron while the ratio of the filled space to empty space by the grating is 1/2.The invention can make the efficiency of +1 class Prague transmission and diffraction in the partial vibration directions of TE and TM be more than 85% at the same time. It realizes free choice of partial vibration model. Especially when the grating density is 1575 lines/ millimeter and the grating depth is 1.2 micron, each efficiency of TE and TM's partial vibration is more than 93%. When the grating density is 1580 lines/ millimeters and its depth is 1.1 micron, the efficiency of +1 class Prague transmission and diffraction under the TE partial vibration model has the max value 97.81%. The invention is produced by the micro-electronics light chiseling craft and the deep eclipse craft. Its cost is low and it is suitable for volume-produce.
Description
Technical field
The present invention relates to grating, particularly a kind of high-diffraction efficiency quartz transmission grating of 632.8 nano wave lengths.
Background technology
Holographic grating and blazed grating are two kinds of traditional gratings: holographic grating is recorded on the sensitization rete by the interference fringe with two-beam and forms; Blazed grating forms by mechanical scratching.These two kinds of gratings all are surface gratings, do not possess the Bragg effect of body grating, so diffraction efficiency are lower, after the surface plates metallic reflective coating, efficient has a certain amount of raising, but the reflectivity of metallic diaphragm is fixing limited, so can not infinitely improve.
It is to utilize the deep etching technique of microelectronics that rectangle loses grating deeply, and what process in substrate has a grating than deep trouth shape.Because the etching depth of surface etch grating is darker, so diffraction property is similar to body grating, has high efficiency body grating Bragg diffraction effect, this point is different fully with the plane grating that common surperficial light engraving loses.The high density rectangle loses the grating diffration theory deeply, can not be explained by simple scalar optical grating diffraction equation, and must adopt the Maxwell equation of vector form and in conjunction with boundary condition, accurately calculate the result by calculation of coding machine program.People such as Moharam have provided the algorithm [formerly technology 1:M.G.Moharamet al., J.Opt.Soc.Am.A.12,1077 (1995)] of rigorous coupled wave theory, can solve this class and lose the grating diffration problem deeply.But as far as we know, nobody provides the design parameter of high-density deeply etched rectangular raster at common wavelengths 632.8 nanometers.
Because high dencity grating polarization often is relevant, practicability is then wished polarization irrelevant, therefore can realize the high efficiency diffracting effect under the situation that polarization mode freely selects, is in demand in actual use.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of high-diffraction efficiency quartz transmission grating of 632.8 nano wave lengths, this grating can be under TE or TM polarization mode diffraction efficiency greater than 85%.
Technical solution of the present invention is as follows:
A kind of high-diffraction efficiency quartz transmission grating of 632.8 nano wave lengths is characterized in that this grating high density rectangle loses grating deeply, and its line density is 1575～1630 lines per millimeters, and the degree of depth of grating is 1.1～1.3 microns, and the dutycycle of grating is 1/2.
The line density of described grating is 1575 lines per millimeters, and the degree of depth of grating is 1.2 microns.
Foundation of the present invention is as follows:
Fig. 1 has shown the geometry of rectangular raster of the present invention.Zone 1,3 all is uniformly, is respectively air and quartz (refractive index n=1.46).The grating part is in zone 2, and its medium 1,3 periodically is alternately distributed.D represents the thickness of grating; ∧ represents the space periodic of grating, is the inverse of grating space line density l, i.e. ∧=1/l; F represents dutycycle, and its size is the length ratio of convex ridge and groove.The light wave λ of one linear polarization incides on the grating with any angle α: when electric field intensity when the y direction of principal axis vibrates, be the TE ripple; When magnetic vector when the y direction of principal axis vibrates, be the TM ripple.
Under optical grating construction as shown in Figure 1, the present invention adopts rigorous coupled wave theory [formerly technology 1] to calculate quartzy grating (dutycycle is 1/2) under 632.8 nano wave length light incidents, raster density, the degree of depth under TE, TM polarization situation+(corresponding incident angle α satisfies α for 1 grade of Prague transmission diffraction efficient
Bragg=sin
-1(λ/(2* ∧))), we obtain as drawing a conclusion:
High spatial frequency diffraction grating, line density are higher than 400 lines per millimeters, have very strong polarization correlated.
By to the grating degree of depth, raster shape and the optimal design in grating cycle, can realize that grating one-level (as+1 grade) glitters, promptly maximum value (more than 90%) appears in diffraction efficiency.
The present invention obtains the numerical optimization result of high-diffraction efficiency rectangular raster according to Theoretical Calculation; promptly when raster density between 1575 lines per millimeters～1630 lines per millimeters, the grating degree of depth is between 1.1 microns～1.3 microns the time; no matter the TE mould still is the TM mould; one-level Prague transmission diffraction efficient of grating can reach more than 85% under 632.8 nano wave lengths, has realized freely selecting polarization mode.Particularly working as raster density is 1575 lines per millimeters, and when the grating degree of depth was 1.2 microns, the efficient of TE and TM polarization mode was all greater than 93%; When raster density is 1580 lines per millimeters, when the grating degree of depth is 1.1 microns, under the TE polarization mode+1 grade of transmission diffraction efficient has maximal value 97.81%.
Description of drawings:
Fig. 1 is the geometry synoptic diagram of grating of the present invention.
Fig. 2 be grating of the present invention (refractive index of fused quartz gets 1.46) when 1.2 microns of the grating degree of depth, dutycycle is 1/2, TE/TM pattern 632.8 nano wave length incident next stage Prague transmission diffraction efficient (%).
Fig. 3 is used for the device synoptic diagram that holographic recording mode of the present invention writes down grating, and alphabetical H represents the He-Cr laser instrument, and S ' represents shutter, and R represents catoptron, and S represents spectroscope, and C represents the filtering collimator apparatus, and SB represents substrate.
Embodiment
Grating of the present invention is the high density rectangular raster that utilizes the micro-optic technology to make, and at first adopts device holographic recording mode shown in Figure 3 to write down grating: utilize He-Cd laser instrument (wavelength is 0.441 μ m) to send two bundle plane waves and form interference field with 2 θ angles on substrate.We adopt the glass sheet that is coated with MICROPOSIT series 1818 photoresists as the record substrate, and ∧ represents the space periodic of grating, i.e. the spacing of adjacent stripes, its size is ∧=λ/(2*sin θ), wherein, λ is the recording light wavelength, adopts 0.441 μ m in experiment.Angle θ is big more for record, and then ∧ is more little, so by changing the size of θ, with the cycle of control grating, periodic quantity designs according to table 1, and the record high dencity grating.Then, the pattern on the photoresist is transferred on the quartz substrate by microelectronics lithographic technique (wet-chemical or reactive ion dry etching), the high dencity grating that is lost deeply behind the flush away photoresist, depth value is chosen from table 1.
Table 1 has provided a series of embodiment of the present invention, in order to obtain the quartzy grating of rectangle that high-diffraction efficiency, polarization mode are freely selected, in the process of making grating, according to table 1, suitably selective light moire grids density l (lines per millimeter) and grating depth d (micron) just can obtain the rectangle quartz grating that high-diffraction efficiency η, polarization mode freely select.
As shown in Table 1, the line density l of this grating is 1575～1630 lines per millimeters, the depth d of grating is 1.1～1.3 microns, the dutycycle of grating is 1/2, one-level Prague transmission diffraction efficiency eta of grating under TE and TM pattern all greater than 85%, when the degree of depth of grating is 1.2 microns, when the line density of grating is 1575 lines per millimeters, one-level Prague transmission diffraction efficiency eta of grating under TE and TM pattern all greater than 93%.No matter one-level Prague transmission diffraction efficient of this grating still be the TM mould for the TE mould like this, can both guarantee more than 93%, makes polarization mode freely to select.
The quartzy grating of rectangular etching of the present invention can be used as the anti-reflection reflection device that disappears of penetrating for 632.8 nano wave lengths, by making full use of holographic grating recording technique, microelectronics photoetching technique and high-density plasma dry method deep etching technology, can be in enormous quantities, produce the grating stable performance after the etching, reliable at low cost.
Under table 1 TE and the 632.8 nano wave length incidents of TM polarization mode ,+1 grade of Prague transmission diffraction efficiency eta, l is grid stroke density (lines per millimeter), d is the grating degree of depth (micron)
Claims (2)
1, a kind of high-diffraction efficiency quartz transmission grating of 632.8 nano wave lengths is characterized in that this grating high density rectangle loses grating deeply, and its line density is 1575～1630 lines per millimeters, and the degree of depth of grating is 1.1～1.3 microns, and the dutycycle of grating is 1/2.
2, the high-diffraction efficiency quartz transmission grating of 632.8 nano wave lengths according to claim 1, the line density that it is characterized in that described grating is 1575 lines per millimeters, the degree of depth of grating is 1.2 microns.
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| CNB2005100265592A CN1322341C (en) | 2005-06-08 | 2005-06-08 | High-diffraction efficiency quartz transmission grating of 632.8 nano wavelength |
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| CN1693930A true CN1693930A (en) | 2005-11-09 |
| CN1322341C CN1322341C (en) | 2007-06-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340877C (en) * | 2006-03-22 | 2007-10-03 | 中国科学院上海光学精密机械研究所 | Back incident type quartz reflective polarizing beam split grating of 632.8 nano wave length |
| CN108008478A (en) * | 2017-12-01 | 2018-05-08 | 暨南大学 | Polarization selective reflection formula grating based on metallic multilayer deielectric-coating |
| CN112630966A (en) * | 2020-12-16 | 2021-04-09 | 浙江大学 | Super surface micro-nano structure monolithic full-color waveguide lens and AR display device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07117605B2 (en) * | 1992-03-13 | 1995-12-18 | 日本ピラー工業株式会社 | Diffraction grating |
| JP3323884B2 (en) * | 1994-02-08 | 2002-09-09 | シャープ株式会社 | Method of manufacturing holographic diffraction grating |
| CA2197706A1 (en) * | 1997-02-14 | 1998-08-14 | Peter Ehbets | Method of fabricating apodized phase mask |
| JP2002214455A (en) * | 2001-01-15 | 2002-07-31 | Sumitomo Electric Ind Ltd | Phase grating mask, method for manufacturing optical waveguide type diffraction grating element, and optical waveguide type diffraction grating element |
| CN1256613C (en) * | 2004-03-19 | 2006-05-17 | 中国科学院上海光学精密机械研究所 | High density, rectangular deep etched crystal raster |
| CN1243257C (en) * | 2004-07-16 | 2006-02-22 | 中国科学院上海光学精密机械研究所 | High density rectangular deep etching quartz transmission raster |
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2005
- 2005-06-08 CN CNB2005100265592A patent/CN1322341C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100340877C (en) * | 2006-03-22 | 2007-10-03 | 中国科学院上海光学精密机械研究所 | Back incident type quartz reflective polarizing beam split grating of 632.8 nano wave length |
| CN108008478A (en) * | 2017-12-01 | 2018-05-08 | 暨南大学 | Polarization selective reflection formula grating based on metallic multilayer deielectric-coating |
| CN108008478B (en) * | 2017-12-01 | 2022-09-09 | 暨南大学 | Polarization selection reflection type grating based on metal multilayer dielectric film |
| CN112630966A (en) * | 2020-12-16 | 2021-04-09 | 浙江大学 | Super surface micro-nano structure monolithic full-color waveguide lens and AR display device |
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| CN1322341C (en) | 2007-06-20 |
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