Related Experiment Video
Updated: Jan 5, 2026
A Multimodal Wide-Field Fourier-Transform Raman Microscope
Published on: December 30, 2025
Dual paths cryptosystem based on tilt Fresnel diffraction using non-spherical mirror and phase modulation in expanded
Hang Chen1,2, Zhengjun Liu3, Camel Tanougast4
1School of Electrical Engineering and Automation, Jiangxi University of Science and Technology, Ganzhou, 341000, China. hitchenhang@foxmail.com.
Abstract:
In this paper, a dual optics paths optical image cryptosystem based on tilt Fresnel diffraction and a phase modulation in extend fractional Fourier transform (eFrFT) domain is presented. The tilt Fresnel is designed by using a non-spherical mirror. A part of data from the original image is modulated by the mirror, while the other part is encoded by an expanded fractional Fourier transform. Besides, the random data of the dual channels is combined for forming the encrypted image. The structure parameters in designing the optical hardware system and the random phase can be regarded as decryption keys. Various potential attack experiments are implemented to check the validity of the proposed cryptographic system.
Related Concept Videos
02:18Interference and Diffraction
01:26Phase Contrast and Differential Interference Contrast Microscopy
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
01:24Properties of Fourier Transform II
The Frequency Shifting property of Fourier Transforms highlights that a shift in the frequency domain corresponds to a phase shift in the time domain. Mathematically, if x(t) has...