Second order diffractive optical elements in a spatial light modulator with large phase dynamic range

2013 ◽  
Vol 51 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Jorge Albero ◽  
Pascuala García-Martínez ◽  
José Luis Martínez ◽  
Ignacio Moreno
Keyword(s):  
Spatial Light Modulator ◽  
Dynamic Range ◽  
Second Order ◽  
Diffractive Optical Elements ◽  
Light Modulator ◽  
Optical Elements ◽  
Phase Dynamic ◽  
Large Phase

scholarly journals Liquid Crystal Spatial Light Modulator with Optimized Phase Modulation Ranges to Display Multiorder Diffractive Elements

2019 ◽  
Vol 9 (13) ◽  
pp. 2592 ◽  
Author(s):  
Elisabet Pérez-Cabré ◽  
María Sagrario Millán
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Visible Spectrum ◽  
Chromatic Aberration ◽  
Light Modulator ◽  
Optical Elements ◽  
First Order ◽  
Large Phase ◽  
Liquid Crystal On Silicon

A liquid crystal on silicon spatial light modulator (LCoS SLM) with large phase modulation has been thoroughly characterized to operate optimally with several linear phase modulation ranges (π, 2π, 3π, 4π, 6π, and 8π) for an intermediate wavelength of the visible spectrum (λG = 530 nm). For each range, the device response was also measured for two additional wavelengths at the blue and red extremes of the visible spectrum (λB = 476 nm and λR = 647 nm). Multiorder diffractive optical elements, displayed on the LCoS SLM with the appropriate phase modulation range, allowed us to deal with some widely known encoding issues of conventional first-order diffractive lenses such as undersampling and longitudinal chromatic aberration. We designed an achromatic multiorder lens and implemented it experimentally on the SLM. As a result, the residual chromatic aberration reduces to one-third that of the chromatic aberration of a conventional first-order diffractive lens.

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.

Shape estimation of diffractive optical elements using high-dynamic range scatterometry

2015 ◽  
Vol 54 (13) ◽  
pp. 4255
Author(s):  
Manabu Hakko ◽  
Tomohiro Kiire ◽  
Daisuke Barada ◽  
Toyohiko Yatagai ◽  
Yoshio Hayasaki
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Diffractive Optical Elements ◽  
Shape Estimation ◽  
Optical Elements ◽  
High Dynamic
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