Method for reducing full light switch pump power, full light switch and its preparing method

Abstract

A method for decreasing the pumping power of all optical switch includes using composite material prepared by conjugated polymer and laser dyestuff to form 2-D photon crystal, coupling detection laser into 2-D photon crystal, locating wavelength of detection laser at edge of photon belt gap on 2-D photon crystal, using a pumping laser to excite said 2-D photon crystal for realizing all optical switch and making wavelength of pumping laser be at linear absorption belt of optical dyestuff on said 2-D photon crystal.

Description

technical field [0001] The invention belongs to the technical field of all-optical switches, and in particular provides a two-dimensional organic photonic crystal all-optical switch with low pumping power and ultra-fast response. Background technique [0002] Photonic crystal is a new type of artificially designed photonic material formed by two or more materials with different dielectric functions arranged periodically in space. It has unique characteristics of controlling photon transmission state. It is used in optical communication, Optical computing and ultra-fast information processing and other fields have very important applications. [0003] The photonic bandgap comes from the modulation of the spatially periodic dielectric function on the incident light wave, and the light whose wavelength (or frequency) falls within the photonic bandgap will be completely reflected back and cannot pass through the photonic crystal. In terms of physical mechanism, the interference...

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Problems solved by technology

At present, many experimental studies on photonic crystal all-optical switches are based on common semiconductor materials. The photonic crystal is pumped by fs laser to excite the semiconductor free carriers to change the refractive index of the material, thereby changing the effective refractive index of the photonic crystal, and the photonic band gap occurs. Move to achieve femtosecond subpicosecond ultrafast response photonic crystal all-optical switch, but the required pump light intensity is in GW / cm 2 (Document 2, M.Shimizu, T.Ishihara.Subpicosecond transmission change insemiconductor embedded photonic crystal slab: Toward ultrafast optical switching.Appl.Phys.Lett.2002,80:2836-2838); Documents 3 and 4 use polyphenylene Ethylene is used as a nonlinear optical material to prepare two-dimensional photonic crystals, and the all-optical switching effect is realized by using photonic bandgap migration and defect state migration. However, the required pump light intensity is greater than 15GW / cm 2 (Document 3, X.Y.Hu, Y.H.Liu, J.Tian, ​​B.Y.Cheng, and D.Z.Zhang. Ultrafastall-optical switching in two-dimensiona organic photonic crystal. Appl. Phys. Lett., 2005, 86: 121102; Document 4, X.Y. Hu, Q.H.Gong, Y.H.Liu, B.Y.Cheng, and D.Z.Zhang. All-optical switching of defectmode in two-dimensional nonlinear organic photonic crystals. Appl. Phys. Lett., 2005, 87: 231111)

Documents 5 and 6 introduce defects into semiconductor photonic crystals, use the movement of defect states to realize photonic crystal all-optical switches, and improve the quality factor of defect modes by designing the structure of photonic crystals and defects, thereby greatly reducing the required The pump light intensity is tens of KW / cm 2 The low pump light intensity has realized the picosecond fast response photonic crystal all-optical switch, but its transmittance is very low, only a few percent of the transmittance, and the preparation process is relatively complicated, and it is difficult to achieve manual control (Reference 5, F. Raineri, C. Cojocaru, P. Monnier, A. Levenson, R. Raj, C. Seassal, X. Letartre, and P. Viktorovitch, Ultrafastdynamics of the third-order nonlinear response in a two-dimensionalInP-based photonic crystal .Appl.Phys.Lett., 2004, 85:1880-1882; Literature 6, T.Tanabe, Masaya Notomi, S.Mitsugi, A.Shinya, and E.Kuramochi, All-optical switches on a silicon chip realized using photonic crystalnanocavities.Appl.Phys.Lett., 2005, 87: 151112)

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