Characterization of an analog ferroelectric spatial light modulator: application to dynamic diffractive optical elements and optical information processing

2001 ◽  
Author(s):  
Pierre Ambs ◽  
Laurent Bigue
Keyword(s):  
Information Processing ◽  
Spatial Light Modulator ◽  
Optical Information ◽  
Diffractive Optical Elements ◽  
Light Modulator ◽  
Optical Elements ◽  
Optical Information Processing

Optical image encryption scheme with extended visual cryptography and non-mechanical ptychographic encoding

2022 ◽  
Author(s):  
Han Yu ◽  
Yong Li ◽  
Junhao Zhang ◽  
Dongyu Yang ◽  
Tianhao Ruan ◽  
...  
Keyword(s):  
Image Encryption ◽  
Spatial Light Modulator ◽  
Visual Cryptography ◽  
Optical Image ◽  
Encryption Scheme ◽  
Diffractive Optical Elements ◽  
Light Modulator ◽  
Optical Elements ◽  
Encoding Scheme ◽  
Optical Image Encryption

Abstract Non-mechanical ptychographic encoding (NPE) transforms the secret information into a series of diffractive patterns through a spatial light modulator, saving the need to fabricate the secret objects. Conventionally, the shares in extended visual cryptography (EVC) are printed on transparent sheets or fabricated with diffractive optical elements and metasurface, but these methods are expensive and disposable. To solve these problems, we proposed an optical image encryption scheme that combines EVC and NPE. In the encryption process, the secret image is decomposed into multiple shares that are digitally loaded on the spatial light modulator, and the ciphertexts are generated according to the ptychographic encoding scheme. The decryption is performed by superimposing the shares reconstructed from the ciphertexts. We present optical experiments to demonstrate the feasibility and effectiveness of the proposed method.

scholarly journals Complex Diffractive Optical Elements Stored in Photopolymers

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1920 ◽  
Author(s):  
Roberto Fernández ◽  
Sergi Gallego ◽  
Andrés Márquez ◽  
Cristian Neipp ◽  
Eva Calzado ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Diffusion Model ◽  
Spatial Light Modulator ◽  
Diffractive Optical Elements ◽  
Light Modulator ◽  
Optical Elements ◽  
New Generation

We study the recording of complex diffractive elements, such as achromatic lenses, fork gratings or axicons. Using a 3-D diffusion model, previously validated, we are able to predict the behavior of photopolymer during recording. The experimental recording of these complex elements is possible thanks to a new generation spatial light modulator capable of generating periodic and aperiodic profiles. Both experimental and theoretical are analyzed and compared. The results show not only the good response of theoretical model to predict the behavior of the materials, but also the viability of photopolymers to store these kind of elements.

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