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All-optical diode structure based on nonlinear microcavity coupling system

A technology of all-optical diode and coupling system, applied in the field of diodes, can solve the problem that all-optical diodes are not realized, etc.

Pending Publication Date: 2019-09-03
CHANGZHOU INST OF LIGHT IND TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, an efficient all-photodiode with adjustable performance parameters has not been realized.

Method used

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  • All-optical diode structure based on nonlinear microcavity coupling system
  • All-optical diode structure based on nonlinear microcavity coupling system
  • All-optical diode structure based on nonlinear microcavity coupling system

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Embodiment

[0022] Embodiment: a kind of all-optical diode structure based on nonlinear microcavity coupling system, coat a layer of metal film on nonlinear Bragg (Bragg) microcavity, utilize the interaction of metal plasma polarization effect and Bragg microcavity mode, Form a coupled system, in this system, the layered structure model is expressed as (AB) n C(BA) n M. Layer C is a microcavity, located in two symmetrical Bragg (Bragg) mirrors (AB)n and (BA) n Between, the M layer represents the metal film, such as figure 1 shown.

[0023] Further, dielectric layers A and B are both Kerr-type nonlinear materials, and their refractive indices are expressed as n A =n 0A +n 1 I(z) and n B =n 0B +n 2 I(z), n 0A and n 0B is the linear refractive index, n 1 and n 2 is the nonlinear coefficient, and I(z) is the position-dependent light intensity. The dielectric constant and thickness of layers A and B are expressed as ε A 、d A and ε B 、d B , the dielectric constant and thicknes...

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Abstract

The invention, which relates to the technical field of diodes, in particular to an all-optical diode structure based on a nonlinear microcavity coupling system. A nonlinear Bragg microcavity is platedwith a metal film; and a coupling system is formed based on the mutual effect of a metal plasmon polarization effect and a Bragg microcavity mode, so that the high-transmissivity microcavity modes and bistable states can be generated. Because of coupling of the surface plasmon generated by a single-layer metal film and a microcavity mode, the electromagnetic field distribution inside the structure is changed and thus the field distribution depends on the incident direction of the light wave, so that the unidirectional transmission of light is realized. The transmissivity and the extinction ratio are both considered by the designed structure; and the forward transmission rate and the extinction ratio can be modulated accurately by changing the metal thickness.

Description

technical field [0001] The invention relates to the technical field of diodes, in particular to an all-optical diode structure based on a nonlinear microcavity coupling system. Background technique [0002] All-optical diodes are similar to electronic diodes and have important applications in optical communication and information processing. In order to realize the function of all-optical diodes, researchers have carried out a lot of design work, including putting magneto-optical materials, liquid crystals, nonlinear materials and anisotropic materials into photonic microstructures to realize unidirectional transmission of light. These studies are of great value to the design of all-photodiodes, but they are difficult to achieve high transmission rate and large extinction ratio at the same time. [0003] Some researchers have designed a one-dimensional composite structure, which is composed of a metal film with nonlinear effect and a one-dimensional photonic crystal. The s...

Claims

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Application Information

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IPC IPC(8): G02B6/122
CPCG02B6/1225
Inventor 朱宇光方云团王纪俊
Owner CHANGZHOU INST OF LIGHT IND TECH
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