A light-driven flexible tunable grating and its preparation method

Abstract

The invention relates to an optical driving flexible adjustable grating and a preparation method thereof. The optical driving flexible adjustable grating is characterized in that the middle part is a polydimethylsiloxane film; two ends are graphene / polydimethylsiloxane films; two sides are fixed on a clamp; and the distance between grids can change following changes of light intensity and irradiation time of irradiation of a first 808nm near-infrared laser and a second 808nm near-infrared laser on the graphene / polydimethylsiloxane films. The flexible adjustable grating can continuously adjust expansion and transformation of the graphene / polydimethylsiloxane films under the irradiation of the near-infrared lasers, so that the distance between the grids can be changed; the operating wavelength of the flexible adjustable grating can be changed; and real-time and all-optical type drive tuning can be realized.

Description

technical field [0001] The invention belongs to the technical field of diffractive optical elements, in particular to a light-driven flexible adjustable grating and a preparation method thereof. Background technique [0002] Due to the needs of semiconductor processing technology, ordinary gratings are mostly made of inorganic materials such as silicon, silicon dioxide or other oxides, silicon nitride or other nitrides, and the grating pitch is fixed under normal working conditions. , only work in a specific wavelength range. Since the grating itself cannot change the working wavelength, when different light needs to be selected, a different grating needs to be replaced. Different from ordinary gratings, tunable gratings can select different wavelengths of light or deflect a certain wavelength of light at different angles by changing the period, and are widely used in micro-spectrometers, scanners, optical communications and other fields. [0003] At present, the basic tun...

AI Technical Summary

Problems solved by technology

Mechanical tuning is to use equipment such as a translation stage to move along the direction of the grating lines to realize the periodic tuning process of the adjustable grating. The requirements for the equipment are very high, and the system is large in size and difficult to move; The grating is electrically driven to change its grating period, so as to achieve the purpose of changing the direction of the diffracted beam. However, if the electrostatic force or piezoelectric type is used to drive the adjustable grating, the sweeping range of the diffraction angle can only be limited to milliradians, and the amount of change in the grating period Only a few nanometers, the required analog voltage is very large, which cannot meet the actual needs

[0004] Temperature tuning mainly changes the temperature of the grating material by means of electric heating. When the power is turned on or off, the temperature of the grating changes and the grating cycle changes. However, there is still a current or voltage input in this method, and there are safety hazards such as circuit short circuit and discharge. , not suitable for spectral monitoring of flammable and explosive gases

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