Tunable optical spatial differential operations via photonic Dirac points

IF 5 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-09-25 DOI:10.1016/j.optlastec.2025.113863

Wenhao Xu , Tingting He , Yunlan Zuo , Ya Yang , Ren Song , Lan Xu

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引用次数: 0

Abstract

We present a tunable optical spatial differentiator that exploits enhanced photonic spin Hall effects (PSHE) near optical Dirac points. By tailoring spin-dependent beam shifts via controlled polarization and incidence angle, the system enables switchable operation between one-dimensional (1D) and isotropic two-dimensional (2D) edge detection. Near the critical incidence, spin–orbit interactions yield complex-valued displacements with Fourier-space transfer functions exhibiting a phase singularity structure, supporting isotropic differentiation with amplified spatial resolution. Numerical simulations and image tests—including comparisons of modulation transfer functions (MTFs) with conventional digital differentiation—demonstrate high-fidelity gradient extraction and superior preservation of fine spatial details. The all-optical passive platform enables compact analog image processing, positioning Dirac-point photonics as an efficient framework for optical computing and edge-enhancement applications.

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通过光子狄拉克点的可调谐光学空间微分操作

我们提出了一个可调谐的光学空间微分器，利用光学狄拉克点附近增强的光子自旋霍尔效应（PSHE）。通过控制偏振和入射角来调整自旋相关的光束位移，系统可以在一维（1D）和各向同性二维（2D）边缘检测之间切换操作。在临界入射附近，自旋轨道相互作用产生具有傅里叶空间传递函数的复值位移，表现出相位奇异结构，支持具有放大空间分辨率的各向同性微分。数值模拟和图像测试——包括调制传递函数（mtf）与传统数字微分的比较——证明了高保真的梯度提取和对精细空间细节的优越保存。全光无源平台实现紧凑的模拟图像处理，将狄拉克点光子学定位为光学计算和边缘增强应用的有效框架。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems