Phase type liquid crystal grating with electrically-controlled continuous tuning diffraction spot positions and manufacturing method of phase type liquid crystal grating

Abstract

The invention belongs to the technical field of gratings, and particularly provides a phase type liquid crystal grating with electrically-controlled continuous tuning diffraction spot positions and a manufacturing method of the phase type liquid crystal grating. The phase type liquid crystal grating comprises an upper substrate and a lower substrate opposite to the upper substrate. The upper substrate comprises upper substrate glass, a comb-like electrode layer and an upper orientation layer which are arranged in sequence. The lower substrate comprises lower substrate glass, a comb-like electrode layer and a lower orientation layer. The portion between the upper orientation layer and the lower orientation layer is filled with nematic phase liquid crystals; the inner sides of the upper and lower glass substrates are plated with transparent conducting film indium tin oxide electrode films, the indium tin oxide electrode films are manufactured into the first comb-like electrode and the second comb-like electrode through an etching method; an angle of 90 degrees is formed between the first glass substrate comb-like electrodes. According to the phase type liquid crystal grating of the novel structure, liquid crystal molecule deflection can be controlled by changing the voltage of the comb-like electrodes, different voltage liquid crystal molecules deflect differently, and diffractive light at different positions has different optical path differences, so that changes of the diffraction position are achieved.

Description

technical field [0001] The invention belongs to the technical field of gratings, and specifically proposes a phase type liquid crystal grating with electronically controlled and continuously tuned diffraction spot positions and a manufacturing method thereof. Background technique [0002] Grating is an important spectroscopic element, which is widely used in the fields of spectrometer, optical calculation and beam deflection. According to the spatial range of the grating to modulate the incident light wave, it can be divided into one-dimensional grating, two-dimensional grating and three-dimensional grating. According to the different modulation methods of the grating on the incident light wave, it can be divided into amplitude grating and phase grating. Phase gratings have higher diffraction efficiency than amplitude gratings. Gratings can be divided into tunable and non-tunable diffraction light intensity. Because liquid crystal molecules have the characteristics of com...

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Problems solved by technology

However, low diffraction efficiency and high driving voltage are the main problems

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