CN106019485A - Narrow band optical filter based on prism coupling guided-mode resonance - Google Patents
Narrow band optical filter based on prism coupling guided-mode resonance Download PDFInfo
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- CN106019485A CN106019485A CN201610372645.7A CN201610372645A CN106019485A CN 106019485 A CN106019485 A CN 106019485A CN 201610372645 A CN201610372645 A CN 201610372645A CN 106019485 A CN106019485 A CN 106019485A
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- Prior art keywords
- cylinder
- narrow band
- optical filter
- low
- band optical
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29344—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by modal interference or beating, i.e. of transverse modes, e.g. zero-gap directional coupler, MMI
Abstract
The invention belongs to a guided wave optical technology field, to be specific, relates to a narrow band optical filter based on prism coupling guided-mode resonance. The narrow band optical filter comprises a composite transparent body (hereinafter referred to as a composite body) combining a circular cylinder or a square cylinder and a planar optical waveguide together. The circular cylinder or the square cylinder is cut open along a longitudinal axis at a certain angle, and the planar optical waveguide is arranged on a section according to a transmission center wavelength, and is formed by different layers and thicknesses. Two cut bodies are attached to each other along the sections, and then are fixed and sealed to form the composite body. The two end surfaces of the composite body are provided with broadband anti-reflection films in a coated manner. During the use, a light beam is transmitted along the longitudinal axis of the composite body, and the transmittance of the center transmittance wavelength can reach 100%, and the band width can reach nm magnitude. The filter provided by the invention has important application in an optical communication technology and a spectrum technology. Based on a prism coupling guided-mode resonance principle, production of a grating structure is not required, and therefore the production is convenient, the use is simple, and the band width is narrow.
Description
Technical field
The invention belongs to Guided Wave Technique field, be specifically related to a kind of narrowband optical based on prism-coupled guide mode resonance
Wave filter.
Background technology
Narrow band optical filter is at optical communication, and spectral technique aspect is requisite optics.Narrow band light can be produced
The technology learning filtering is a lot, such as optical thin film, interferometric filter, and guide mode resonance wave filter based on optical grating construction
Deng.But, the most complicated structure of these devices, preparation process is complicated.
It is guide mode resonance optical filtering technique based on prism-coupled that the present invention proposes narrow band optical filter, with optical grating construction
Guide mode resonance technology corresponding, but the device architecture of the present invention does not contains grating, therefore can save the sub-ripple of preparation
The complex process of long optical grating construction, such that it is able to be greatly simplified technique, improves the quality of device.And due to the most true during design
The direction determining incident illumination is normal incidence, therefore without carrying out angle adjustment, easy to use.
Summary of the invention
It is an object of the invention to provide a kind of guide mode resonance narrow band optical filter based on prism-coupled.
The basic structure of planar optical waveguide is " low-high-low " three-decker being made up of the material of different refractivity, rib
Mirror coupling is to be closed with planar optical waveguide note by the prism planes of high-index material, constitutes the lateral refraction of " high-low-high-low "
Rate distributed architecture.Under conditions of suitable coupling distance, the guided wave mode in waveguide can be by by the light beam institute of prism-coupled
Excite, planar optical waveguide is formed guided mode.If at this moment by another block high index prism base note together in planar optical waveguide
Another side, constitute " high-low-high-low-high " index distribution, then the guided mode that second piece of prism can will conduct in waveguide
Optical coupling out, forms guided modes.This is the prism coupling to planar optical waveguide: input coupling and output coupling.By this
Two step couplings of sample, the light wave of specific wavelength can be transmitted to opposite side from the prism of planar optical waveguide side.According to planar light
The material of waveguide and the regulation of thickness, can make the bandwidth of the light of conduction effectively be controlled.
Prism-coupled principle based on above-mentioned planar optical waveguide, the present invention devises a kind of based on prism-coupled guide mode resonance
Narrow band optical filter, its passband center wavelengths transmitance is up to 100%, and pass band width reaches nm magnitude, its structure such as Fig. 1 institute
Show.Specifically include: a collimated incident beam, one by cleaved two cutting bodies formed of cylinder (such as cylinder or square body) with
The composite transparencies (hereinafter referred to as complex) of planar optical waveguide composition；Wherein, two cutting bodies are (such as cylinder or side by cylinder
Cylinder) cut along the longitudinal axis angled (A) and two symmetrical parts of obtaining, at the tangent plane that this two cutting bodies are relative
Being planar optical waveguide between (inclined-plane), this planar optical waveguide is depended on by low-index film, high refractive index layer, low-index film
The secondary composition that coincides, whole complex is still a cylinder (such as cylinder or square body)；The both ends of the surface of complex are shaped with broadband anti-reflection film.
During preparation, first cylinder is obtained two cutting bodies of symmetry along the longitudinal axis angled (A) incision, a cutting
According to centre of homology wavelength on body tangent plane (inclined-plane), prepare planar optical waveguide；Planar optical waveguide is thin by the different numbers of plies and thickness
Film is constituted；Again two cutting bodies are closed along tangent plane note, fixing, and seal, i.e. constitute complex；Complex both ends of the surface are coated with broadband
Anti-reflection film.During use, light beam is along complex longitudinal axis transmission.
The wave filter of the present invention has important application at optical communication, the aspect such as spectral technique.The present invention is based on prism-coupled
Guide mode resonance principle, it is not necessary to prepare optical grating construction, therefore has preparation convenient, easy to use, the advantage of narrow bandwidth.
In the present invention, described collimated incident beam is collimated beam.
In the present invention, the broadband anti-reflection film that according to the antireflective coating of described both ends of the surface, the centre wavelength of design is coated with
Layer.
In the present invention, the Refractive Index of Material of described cylinder (cylinder or square body) cutting body is higher than two low refractive index films
The refractive index of layer.
In the present invention, the tangent plane of said two cutting body is inclined-plane, and when cylinder is cylinder, its tangent plane is oval, when
When cylinder is square body, its tangent plane is rectangle.
In the present invention, said two low-index film and high refractive index layer, both refractive indexs are high and low is to compare
For.
The material of described low-index film can be air, or is uniformly and to treat the transparent gas of filter section, liquid
Or solid.
The invention have the advantages that
1, the structure of the present invention is a kind of planar optical waveguide conducting structure based on prism-coupled, relative to grating coupled knot
Structure, its great advantage is without grating, therefore eliminates the complex process preparing sub-wave length grating, only with certain coating process
Add assembling can complete, the transmitance of 100% can be reached equally, and pass band width also can reach nm magnitude；
2, it is a further advantage of the invention that the cutting angle by design, it can be ensured that incident illumination passes through in normal incidence mode
This wave filter, and without complicated angle adjusting mechanism, thus there is easy to use and easy feature.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of narrow band optical filter based on prism-coupled guide mode resonance.
Fig. 2 is the refractive index spatial distribution of filter construction midplane ducting layer normal direction shown in Fig. 1.
Fig. 3 enters the light beam intensity to the ducting layer of prism coupling structure midplane shown in Fig. 1 for (wavelength 632.8nm)
Transmitance is with the variation relation of angle of incidence.
Fig. 4 is the transmitted spectrum (setting the both ends of the surface transmitance of complex as 100%) of wave filter shown in Fig. 1.
Fig. 5 is that the transmitted spectrum of the wave filter visible light wave range from 500 to 900nm shown in Fig. 1 (sets the both ends of the surface of complex
Transmitance is 100%).
Label in figure: 1 is collimated incident beam, 2 and 8 is end face antireflective coating, and 3 and 7 is cylinder or square body cutting
Body, 4 is low-index film, 5 high refractive index layers, 6 low-index films.
Detailed description of the invention
The narrow band optical filter based on prism-coupled guide mode resonance of present invention design, including: a cylinder or square column
Body and the composite transparencies of planar optical waveguide (hereinafter referred to as complex). wherein cylinder or square body are become certain angle along the longitudinal axis
Degree cuts, and according to centre of homology wavelength on a tangent plane, prepares planar optical waveguide, and planar optical waveguide is by the different numbers of plies and thickness
Thin film constitute. again two cutting bodies are closed along tangent plane note, fixing, and seal, constitute complex.Complex both ends of the surface are coated with
Broadband anti-reflection film.The narrow band filter of the present invention, specifically includes: collimated incident beam 1, end face antireflective coating 2 and 8, cylinder or
Square body cutting body 3 and 7, planar optical waveguide, by low-index film 4, high refractive index layer 5, low-index film 6 is constituted,
Structural representation is as shown in Figure 1.
Low-index film 4 in described planar optical waveguide is a low-index film, is used for connecting high refractive index film
Layer 5 and cutting body 3, it prepares material can be air or for uniformly and treat the gas that filter section is transparent, liquid, or solid.
High refractive index layer 5 refractive index in described planar optical waveguide is higher than low-index film 4 and 6.
Low-index film 6 in described planar optical waveguide is a low-index film, is used for connecting high refractive index film
Layer 5 and cutting body 7.
According to the structure shown in Fig. 1, selecting a laser work wavelength such as: 632.8nm, cylindrical material is flint glass,
Refractive index 1.56, using it as couple prism body material. grazing shot rate film layer (4) in planar waveguiding structure, it is taken as air, folding
The rate of penetrating is 1, and thickness controls to draw materials dense flint glass at 200nm. high refractive index layer (5) by clearance mechanism, refractive index
1.75, thickness is 200nm.Low-index film (6) takes fused quartz, refractive index 1.45, and thickness is 486nm.The folding of total
Rate of penetrating is distributed as shown in Fig. 2；In the coordinate system set up, the normal N direction along slab guide is taken as X, and complex axis side
To being taken as Z.
Utilizing strict coupled-mode theory, after a branch of collimated beam enters this wave filter, it is at each several part of wave filter
The field intensity expression formula of light field can be stated by equation below: as a example by H mode (TE ripple), in such as the coordinate system of Fig. 1:
(1)
In above formula, index number represents light field place structural region, and A, B represent the coefficient of relevant intrinsic ripple. and λ represents ripple in phase
Close the characteristic value in region,, niRepresent the refractive index of respective regions, diRepresent the thickness of respective regions
Degree, i=3,4,5,6,7, β is the propagation vector of the light along Z direction.
Application TE ripple electric field intensity is in the condition of continuity of boundary, and assumes that incident field is in complex cutting body (3)
It is 1 with the light field amplitude of low-index layer (4) interface, light distribution of light intensity in cutting body (7) can be solved and cutting with light
Cut the ratio of distribution of light intensity in body (3), i.e. transmitance:, as shown in Fig. 3.Visible from the situation of 40 ° to 90 °
Under, absorbance reaches the transmitance of 100% 86.4418 ° when, and angular range is the least.
With this wave filter of collimated beam transmission of certain bandwidth, its spectral transmittance is as shown in Figure 4.Its full width at half maximum degree is
633.9-631.7=2.2nm.Fig. 5 shows the transmitance of the visible light wave range from 500 to 900nm of this wave filter, it is seen that should
Effective filter effect of wave filter, i.e. only one of which passband.Therefore, the present invention can be able to obtain in optical communication and spectral technique
To being widely applied.
Claims (8)
1. the composite transparencies that two cutting bodies of the cleaved formation of cylinder form with planar optical waveguide, hereinafter referred to as complex；
Wherein, two cutting bodies are two the symmetrical parts obtained along the angled incision of the longitudinal axis by cylinder, cut at these two
Cutting between the tangent plane that body is relative is planar optical waveguide, and this planar optical waveguide is by low-index film, high refractive index layer, low refraction
Rate film layer coincides composition successively, and whole complex is still a cylinder；The both ends of the surface of complex are shaped with broadband anti-reflection film.
Narrow band optical filter the most according to claim 1, it is characterised in that described collimated incident beam is collimated light
Bundle.
Narrow band optical filter the most according to claim 1, it is characterised in that the antireflective coating of described both ends of the surface is root
The broadband anti-reflection film layer being coated with according to the centre wavelength of design.
Narrow band optical filter the most according to claim 1, it is characterised in that the material refraction of described cylinder cutting body
Rate is higher than the refractive index of two low-index films.
5. according to the narrow band optical filter described in claim 1,2,3 or 4, it is characterised in that described cylinder be cylinder or
Square body.
Narrow band optical filter the most according to claim 5, it is characterised in that the tangent plane of said two cutting body is oblique
Face, when cylinder is cylinder, its tangent plane is oval, and when cylinder is square body, its tangent plane is rectangle.
7. according to the narrow band optical filter described in claim 1,2,3,4 or 6, it is characterised in that said two low-refraction
Film layer and high refractive index layer, both refractive indexs are high and low is comparatively speaking.
Narrow band optical filter the most according to claim 7, it is characterised in that the material of described low-index film is empty
Gas, or be uniformly and to treat the transparent gas of filter section, liquid or solid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610372645.7A CN106019485B (en) | 2016-05-31 | 2016-05-31 | A kind of narrow band optical filter based on prism-coupled guide mode resonance |
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| CN201610372645.7A CN106019485B (en) | 2016-05-31 | 2016-05-31 | A kind of narrow band optical filter based on prism-coupled guide mode resonance |
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| CN106019485A true CN106019485A (en) | 2016-10-12 |
| CN106019485B CN106019485B (en) | 2019-02-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896450A (en) * | 2017-03-27 | 2017-06-27 | 复旦大学 | A kind of many passband poles narrow band optical filter based on prism-coupled |
| CN109164526A (en) * | 2018-09-18 | 2019-01-08 | 复旦大学 | A kind of unpolarized type narrow-band optical bandpass filter |
| CN109445155A (en) * | 2018-12-22 | 2019-03-08 | 复旦大学 | A kind of unpolarized type narrow-band optical bandpass filter of electric tuning |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3970360A (en) * | 1974-04-19 | 1976-07-20 | Siemens Aktiengesellschaft | Wave-guide structure with a multi-layer system and methods for producing same |
| CN200947125Y (en) * | 2005-08-23 | 2007-09-12 | 中山大学 | Single-frequency sharp angle spatial filter |
| WO2010025536A1 (en) * | 2008-09-08 | 2010-03-11 | National Research Council Of Canada | Thin film optical filters with an integral air layer |
| CN102681066A (en) * | 2012-05-23 | 2012-09-19 | 天津大学 | High-efficient wide-angle coupling grating |
| CN103698829A (en) * | 2013-11-22 | 2014-04-02 | 中国科学院上海光学精密机械研究所 | Combined multilayer dielectric film cut-off filter device |
-
2016
- 2016-05-31 CN CN201610372645.7A patent/CN106019485B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3970360A (en) * | 1974-04-19 | 1976-07-20 | Siemens Aktiengesellschaft | Wave-guide structure with a multi-layer system and methods for producing same |
| CN200947125Y (en) * | 2005-08-23 | 2007-09-12 | 中山大学 | Single-frequency sharp angle spatial filter |
| WO2010025536A1 (en) * | 2008-09-08 | 2010-03-11 | National Research Council Of Canada | Thin film optical filters with an integral air layer |
| CN102681066A (en) * | 2012-05-23 | 2012-09-19 | 天津大学 | High-efficient wide-angle coupling grating |
| CN103698829A (en) * | 2013-11-22 | 2014-04-02 | 中国科学院上海光学精密机械研究所 | Combined multilayer dielectric film cut-off filter device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106896450A (en) * | 2017-03-27 | 2017-06-27 | 复旦大学 | A kind of many passband poles narrow band optical filter based on prism-coupled |
| CN109164526A (en) * | 2018-09-18 | 2019-01-08 | 复旦大学 | A kind of unpolarized type narrow-band optical bandpass filter |
| CN109445155A (en) * | 2018-12-22 | 2019-03-08 | 复旦大学 | A kind of unpolarized type narrow-band optical bandpass filter of electric tuning |
| CN109445155B (en) * | 2018-12-22 | 2021-07-23 | 复旦大学 | Electrically tuned non-polarized narrow-band optical band-pass filter |
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| CN106019485B (en) | 2019-02-26 |
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