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Dynamic adjustable filter based on defect-containing refractive index layered periodic structure

A technology of periodic structure and refractive index layer, which is applied in the field of optoelectronics, can solve problems such as difficult to control, and achieve the effect of simple manufacturing process

Inactive Publication Date: 2011-10-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this design has a fatal shortcoming, that is, once the structure of the layered periodic structure is formed, it is difficult to control it.

Method used

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  • Dynamic adjustable filter based on defect-containing refractive index layered periodic structure
  • Dynamic adjustable filter based on defect-containing refractive index layered periodic structure
  • Dynamic adjustable filter based on defect-containing refractive index layered periodic structure

Examples

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Embodiment Construction

[0023] Such as figure 1 As shown, the dynamically tunable filter of the present invention mainly includes a periodic refractive index modulated layered periodic structure and a sound source, wherein the sound source is located at one end of the periodic refractive index modulated layered periodic structure with a half-wave defect and is connected to It maintains a stable rigid contact with low acoustic impedance. The refractive index of the structure changes periodically, and each period contains a refractive index of n A , n B of two parts, each of length d A 、d B nanometer, then at wavelength n A d A +n B d B The vicinity of will form a forbidden band, and set n A d A =n B d B ; The half-wave defect refers to the insertion of a unit with a phase delay equal to any part of the period in the layered periodic structure of the periodic refractive index modulation, so that a defect is formed in the center of the forbidden band of the periodic refractive index modulated...

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Abstract

The invention discloses a dynamic adjustable filter based on a defective refractive index laminar periodic structure. The dynamic adjustable filter comprises a laminar periodic structure modulated by periodic refractive index and a sound source; the sound source is positioned at one end of the laminar periodic structure which is provided with semiwave defect and is modulated by periodic refractive index and keeps stable, rigid and low-acoustic impedance contact with the structure. The dynamic adjustable filter is characterized in that sound wave with certain frequency and strength is conducted to the defective laminar periodic structure modulated by periodic refractive index in a different mode; through the change of strength of sound wave, defect-mode wavelength transmitted in the laminar periodic structure is modulated; and through the change of sound wavelength, the output effect of single wavelength-multiwavelength is reached. The dynamic adjustable filter has novel design, feasible preparation and wide application prospect in the field of optical communication and sensing.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and in particular relates to the acousto-optic interaction in a layered periodic structure containing defects, and a novel dynamic adjustable filter based on the effect. More specifically, it is a dynamically adjustable single / multi-wavelength bandpass filter designed by modulating the defect mode of a layered periodic structure containing defects by sound waves. Background technique [0002] Periodically modulated refractive index structures have attracted more and more attention in the fields of optical communication and sensing in recent years. Due to the periodic change of the refractive index, the periodically modulated layered periodic structure of the refractive index can form a Bragg forbidden band related to the changing period, which plays a role of reflection during the transmission of light waves. As early as half a century ago, physicists have known that electrons in crystal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/11
Inventor 钱小石陆延青卢明辉陈延峰
Owner NANJING UNIV
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