Results 41 to 50 of about 5,049 (222)

Arbitrary shape surface Fresnel diffraction

Optics Express, 2012
Fresnel diffraction calculation on an arbitrary shape surface is proposed. This method is capable of calculating Fresnel diffraction from a source surface with an arbitrary shape to a planar destination surface. Although such calculation can be readily calculated by the direct integral of a diffraction calculation, the calculation cost is proportional ...
Shimobaba, Tomoyoshi, Masuda, Nobuyuki, Ito, Tomoyoshi   +2 more
openaire   +3 more sources

Programmable In‐Situ Interactions Between Resins and Photopolymerized Structures for Seamlessly Integrated Optical Manufacturing of Microlenses

Advanced Functional Materials, EarlyView.
This study presents a dynamic interaction between liquid resins and photopolymerized structures enabled by an in situ light‐writing setup. By controlling a three‐phase interface through localized photopolymerization, which provides physical confinement for the remaining uncured resin regions, the approach establishes a programmable pathway that ...
Kibeom Kim, Sangmin Oh, Kahyun Hur, Hyesung Cho   +3 more
wiley   +1 more source

Novel Functional Materials via 3D Printing by Vat Photopolymerization

Advanced Functional Materials, EarlyView.
This Perspective systematically analyzes strategies for incorporating functionalities into 3D‐printed materials via Vat Photopolymerization (VP). It explores the spectrum of achievable functionalities in recently reported novel materials—such as conductive, energy‐storing, biodegradable, stimuli‐responsive, self‐healing, shape‐memory, biomaterials, and
Sergey S. Nechausov, Patrick Fesser, Boris A. Bulgakov, Ulrich S. Schubert   +3 more
wiley   +1 more source

Asymmetric Image Encryption and Authentication Based on Equal Modulus Decomposition in the Fresnel Transform Domain

IEEE Photonics Journal, 2019
A novel asymmetric image encryption and authentication scheme based on equal modulus decomposition (EMD) in the Fresnel transform domain is proposed. First, the Fresnel spectrum of the plaintext is sparsely sampled.
Guangyu Luan, Aichuan Li, Dongmei Zhang, Dongxin Wang   +3 more
doaj   +1 more source

Simulation of GHz ultrasonic wave piezoelectric instrumentation for Fourier transform computation

Scientific Reports, 2023
The recent emerging alternative to classic numerical Fast Fourier transform (FFT) computation, based on GHz ultrasonic waves generated from and detected by piezoelectric transducers for wavefront computing (WFC), is more efficient and energy-saving.
Zaifeng Yang, Xing Haw Marvin Tan, Viet Phuong Bui, Ching Eng Png   +3 more
doaj   +1 more source

Programmable Dimensional Lithography with Digital Micromirror Devices for Multifunctional Microarchitectures

Advanced Materials Technologies, EarlyView.
This review explores recent advances in digital micromirror device (DMD)‐based lithography, focusing on its programmable light modulation, multi‐material compatibility, and dimensional patterning strategies. It highlights innovations from optical system design to materials integration and multifunctional applications, positioning DMD lithography as a ...
Yubin Lee, Byungcheon Yoo, Chaeyeong Ryu, Jongwon Oh, Dahye Baek, Jiseok Lee   +5 more
wiley   +1 more source

Millimeter‐wave diffraction‐loss model based on over‐rooftop propagation measurements

ETRI Journal, 2020
Measuring the diffraction loss for high frequencies, long distances, and large diffraction angles is difficult because of the high path loss. Securing a well‐controlled environment to avoid reflected waves also makes long‐range diffraction measurements ...
Kyung‐Won Kim, Myung‐Don Kim, Juyul Lee, Jae‐Joon Park, Young Keun Yoon, Young Jun Chong   +5 more
doaj   +1 more source

Diffraction mode selection in planar lasers with Bragg resonators [PDF]

ITM Web of Conferences, 2019
Using the coupled-wave approach supplemented by the quasioptical approximation, we investigate the possibilities of diffraction mode selection with respect to the transverse index in planar distributed-feedback lasers.
Ginzburg Naum, Sergeev Alexander, Kocharovskaya Ekaterina, Malkin Andrey, Egorova Ekaterina, Zaslavsky Vladislav   +5 more
doaj   +1 more source

Photonic Hybrid Integration: Strategies and Promises of Advanced Additive Manufacturing

Advanced Optical Materials, EarlyView.
Heterogeneous photonic integration combines wafer bonding, transfer printing, and advanced multi‐photon lithography to realize compact, adaptable photonic systems. This review highlights breakthroughs in hybrid materials, metrology, and 4D printing, revealing how the convergence of traditional and emerging fabrication unlocks scalable, high‐performance
Zhitian Shi, Huiyu Huang, Richard Penty, Qixiang Cheng   +3 more
wiley   +1 more source

Sparse Matching Filtering Algorithm for Tomographic SAR Imaging

Leida xuebao
Synthetic Aperture Radar Tomography (TomoSAR) has emerged as the primary technique for generating 3D SAR point clouds. In practice, ignoring the quadratic phase distribution in the elevation dimension causes defocusing artifacts due to inherent Fresnel ...
Hui LIU, Chunmeng ZHAO, Pengfei CHEN, Yanzhi WANG, Minghao QU, Ning XIAO   +5 more
doaj   +1 more source