Diagrammatic Explanation of the Reverse Doppler Effect in Space-Time Modulated Photonic Crystals

Phase-Induced Frequency Conversion and Doppler Effect with Time-Modulated Metasurfaces

Metasurfaces consisting of electrically thin and densely packed planar arrays of subwavelength elements enable an unprecedented control of the impinging electromagnetic fields. Spatially modulated metasurfaces can efficiently tailor the spatial distribution of these fields with great flexibility. Similarly, time modulated metasurfaces can be successfully used to manipulate the frequency content and time variations of the impinging field. In this paper, we present time-modulated reflective metasurfaces that cause a frequency shift to the impinging radiation, thus realizing an artificial Doppler…

增强的太阳光旋转多普勒频移检测

Enhanced Detection of Rotational Doppler Shift from Sunlight

本文研究了利用部分相干光源实现太阳光旋转多普勒频移检测，发现低光条件下不同波长的旋转多普勒信号叠加能显著增强信号强度，提高信噪比，从而实现对物体旋转速度的准确测量。

多普勒脉冲放大

Doppler Pulse Amplification

针对啁啾脉冲放大（CPA）存在的增益窄化限制脉冲时长的问题，提出基于时空调制界面多普勒频移的多普勒脉冲放大（DoPA）方法，可缓解增益窄化且系统更紧凑，为高效高强度激光系统提供新路径。

Calculating spatiotemporally modulated surfaces: a dynamical differential formalism

Electromagnetic waves in a system with a space and time dependent boundary experience both diffraction and Doppler-like frequency conversion. In order to analyse such situations, conventional methods call for either the eigenmodes or the dyadic Green's function in space and time dependent media. Here, we propose a dynamical differential method which does not require either of them. Our method utilises a dynamical coordinate transformation in order to simplify the calculation of the optical response of the space and time dependent system. We reveal that the diffraction symmetry is broken in the…

时空楔形结构

Space-Time Wedges

本研究提出由两个不同速度运动界面构成的新型时空调制结构时空楔形结构，推导其电磁波散射闭式解并揭示多次时空散射、多普勒频移等物理机制，为光学与光子学应用提供新方向。

波导QED中参数调制耦合下的非线性动力学卡西米尔效应与Unruh纠缠

Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling

本文针对波导QED中运动量子比特阵列，建立了结合微扰图技术与master方程的通用理论框架，揭示了方向性动力学卡西米尔效应和可纠缠的集体Unruh效应，并分析了辐射反作用对力学谱的影响。