Photonics Research, Volume. 9, Issue 4, 610(2021)
Optically addressed spatial light modulator based on nonlinear metasurface Editors' Pick
Fig. 1. Operation principle of an MS-OASLM. (a) An illustration for the MS-OASLM. Write beams (green arrows) with different intensities cause a spatially heterogeneous photoisomerization (trans state to cis state) of ethyl-red azo molecules and selectively tune optical responses of the MS. This consequently affects readout light polarization in a nonlinear manner, as indicated by the differently rotated red arrow plane in the transmission side. Inset gives an SEM image of the MS unit cell. (b) Transmission spectra of the MS for
Fig. 2. Image projection based on an MS-OASLM. (a) Schematic of the MS-OASLM image projection system. An input mask is imaged onto the MS plane using 532 nm green light and is duplicated in form of a spatially inhomogeneous polarization distribution in readout light. Such a polarization replica is transformed into an intensity replica by filtering through a combination of a waveplate and a polarizer. (b) Nonlinear intensity modulation
Fig. 3. Read out images of binary masks and resolution test charts. (a) Binary masks include a series of letters, “I ♡ N K U”. First row gives optical images of the masks captured directly using green light (532 nm). Images read by the red beam (820 nm) are shown in the second row. Scale bar is 10 μm. (b) Images of different sized resolution test charts by the green light are given in the first and third rows, while images by the read beam are given in the second and fourth rows. The sizes of chart images are labeled beside each pattern. The charts with sizes of 5 μm are well recognized as three distinct lines, corresponding to a spatial resolution of 500 lp/mm.
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Shengchao Gong, Mengxin Ren, Wei Wu, Wei Cai, Jingjun Xu. Optically addressed spatial light modulator based on nonlinear metasurface[J]. Photonics Research, 2021, 9(4): 610
Category: Nonlinear Optics
Received: Dec. 3, 2020
Accepted: Feb. 10, 2021
Published Online: Apr. 6, 2021
The Author Email: Mengxin Ren (ren_mengxin@nankai.edu.cn)