Single-channel tunable filter in visible band based on one-dimensional photonic crystals

A dimensional photonic crystal and tuning filter technology, which is applied in the direction of optical waveguide light guide, light guide, optics, etc., can solve the problems of inability to achieve tuning and inability to tune the conduction band, and achieve the effects of easy acquisition, good filtering performance, and simple structure

Inactive Publication Date: 2012-11-14
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this structural model can realize the multicolor filter concept in the visible light range, it cannot completely cover the visible light range and cannot realize the tuning function.
[0006] Optimization of dichromatic filters based on photonic heterostructures of Si / MgF 2 , Optics Communications. 2012, Vol:285,2656-2659) proposed the use of Si and MgF 2 Two dielectric materials according to the structure [(AB) m (CD) s ] q (AB) m (where A, C represent Si, B, D represent MgF 2 ) are arranged to form a one-dimensional photonic crystal, and reflectors and filters in the visible light range can be realized by changing the values ​​of m, s, and q, but this theoretical model has limitations that the forbidden band cannot cover the entire visible light range and the conduction band cannot be tuned.

Method used

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  • Single-channel tunable filter in visible band based on one-dimensional photonic crystals
  • Single-channel tunable filter in visible band based on one-dimensional photonic crystals
  • Single-channel tunable filter in visible band based on one-dimensional photonic crystals

Examples

Experimental program
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Effect test

Embodiment 1

[0083] The two dielectric materials used in this example are lithium fluoride (dielectric constant 1.96) and gallium antimonide (dielectric constant 20.25), according to [LiF / GaSb] 3 The structural arrangement forms a one-dimensional photonic crystal. The thickness of lithium fluoride d 1 =0.78 ɑ =98.3nm, gallium antimonide thickness d 2 =0.22 ɑ =27.7nm, lattice constant ɑ =126.0nm.

[0084] A fully automatic magnetron sputtering coating machine model MSP-3200C is used to alternately grow lithium fluoride and gallium antimonide on the optical substrate by coating method, a total of 6 layers. First, the sixth layer of gallium antimonide is coated and grown on the optical substrate with a thickness of 27.7nm, and then the fifth layer of lithium fluoride is coated and grown on the sixth layer of gallium antimonide with a thickness of 98.3nm to obtain a period of the photonic crystal. Then use the same method to grow for 2 more cycles to obtain three cycles of [LiF / Ge] ...

Embodiment 2

[0088] The two dielectric materials used in this example are lithium fluoride (dielectric constant 1.96) and germanium (dielectric constant 16.00), according to [LiF / Ge] 3 The structural arrangement forms a one-dimensional photonic crystal. The thickness of lithium fluoride d 1 =0.74 ɑ =93.2nm, germanium thickness d 2 =0.26 ɑ =32.8m, lattice constant ɑ =126.0nm.

[0089] The preparation method of the one-dimensional photonic crystal single-channel tunable filter in the visible light band is the same as that in Example 1.

[0090] When the thickness of the air layer C d 3 at 0.3 a ~1.5 a When changing within the range, the transmittance characteristics of the tunable filter are as follows Figure 11 ~ Figure 17 As shown, the bandgap width increases with d 3 Widen with the increase of , always covering the entire visible light range, the position of the channel moves continuously between 418.3nm and 591.0nm, and the width changes between 1.3nm and 2.2nm.

Embodiment 3

[0092] The two dielectric materials used in this example are magnesium fluoride (dielectric constant 1.38) and germanium (dielectric constant 16.00), according to [MgF 2 / Ge] 3 The structural arrangement forms a one-dimensional photonic crystal. The thickness of lithium fluoride d 1 =0.76 ɑ =95.8nm, germanium thickness d 2 =0.24 ɑ =30.2nm, lattice constant ɑ =126.0nm.

[0093] The preparation method of the one-dimensional photonic crystal single-channel tunable filter in the visible light band is the same as that in Example 1.

[0094] When the thickness of the air layer C d 3 at 0.3 a ~1.5 a When changing within the range, the transmittance characteristics of the tunable filter are as follows Figure 18 ~ Figure 24 As shown, the bandgap width increases with d 3 The channel becomes wider and wider as it increases, and always covers the entire visible light range. The position of the channel moves continuously between 407.0nm and 584.4nm, and the width varies ...

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Abstract

The invention discloses a single-channel tunable filter in a visible band based on one-dimensional photonic crystals. The filter consists of the two parallel and structurally identical one-dimensional photonic crystals D1 and D2 of [A / B]3 and a thickness-adjustable air defect layer C arranged between the two one-dimensional photonic crystals, wherein at least one of the one-dimensional photonic crystals can be moved so as to adjust the thickness d3 of the air defect layer C, so that a filtering channel of the filter changes in position along with the thickness so as to form the tunable filter. The filter disclosed by the invention has a simple structure, various dielectric materials can be combined together according to different thickness ratios so as to be applied to the filter, and the filter can be used flexibly and simply, has a good filtering characteristic and excellent application prospect in the field of optical communications.

Description

technical field [0001] The invention relates to a photonic crystal filter, in particular to a tunable photonic crystal filter. Background technique [0002] With the continuous development of optical communication technology, the amount of information to be transmitted continues to increase, and people's requirements for communication networks continue to increase. The future optical communication network will develop towards intelligence, flexibility and configurability, and tunable filters with large tuning range, ultra-narrow band, covering the entire visible range, and tunable are important devices to realize this trend. The tunable filters that have been applied now mainly include Fabry-Perot tunable filters, fiber Bragg grating tunable filters and arrayed waveguide tunable filters, etc., but the coordination range of these tunable filters Narrower and wider bandwidth, higher energy consumption. [0003] Photonic crystals are artificial crystals formed by periodic arr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/122G02B6/13
Inventor 杨毅彪李秀杰李祥霞李维强韩昌盛田东康
Owner TAIYUAN UNIV OF TECH
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