Waveguide to Coax Adapter

Coupled thermal and power transport of optical waveguide arrays: photonic Wiedemann-Franz law and rectification effect

主讲人：吕京涛 教授（华中科技大学）

题目：Coupled thermal and power transport of optical waveguide arrays: photonic Wiedemann-Franz law and rectification effect

FT-RF Waveguide to Coax Adapters has N-type and SMA connections. The frequency range for this Waveguide Coaxial Adapter Series is 350 MHz to 18 GHz, with a low VSWR.

Microwave equipment is frequently connected to coaxial components such as attenuators, switches, and couplers using waveguide-to-coaxial adapters. They are frequently used in satellite and terrestrial communications equipment.

时间：2024年07月22日上午10：30

地点：理工楼1215

报告摘要：

In isolated nonlinear optical waveguide arrays, simultaneous conservation of longitudinal momentum flow (`internal energy') and optical power (`particle number') of the optical modes enables study of coupled thermal and particle transport in the negative temperature regime[1,2]. Based on exact numerical simulation and rationale from Landauer formalism, we predict generic photonic version of the Wiedemann-Franz law in such systems, with the Lorenz number L∝ |T|-2[3]. This is rooted in the spectral decoupling of thermal and particle current, and their different temperature dependence. In addition, in asymmetric junctions, relaxation of the system toward equilibrium shows apparent asymmetry for positive and negative biases, indicating rectification behaviour. This work illustrates the possibility of simulate nonequilibrium transport processes using optical networks, in parameter regimes difficult to reach in natural condensed matter or atomic gas systems.    

1.F. O. Wu, A. U. Hassan, and D. N. Christodoulides, Thermodynamic theory of highly multimoded nonlinear optical systems, Nat. Photonics 13, 776 (2019).

2.Z Xiong, F. O. Wu, J.-T. Lü, Z. Ruan, D. N. Christodoulides, Y. Chen, K-space thermodynamic funneling of light via heat exchange, Phys. Rev. A 105, 033529 (2022).

3.M. Lian, Y. Geng, Y.-J. Chen, Y. Chen, J.-T. Lü, Violation of the Wiedemann-Franz law in coupled thermal and power transport of optical waveguide arrays, arXiv:2307.16529.

个人简介：

       吕京涛，华中科技大学物理学院教授。在清华大学和中科院上海微系统与信息技术研究所获得学士和博士学位后，分别在新加坡国立大学、丹麦技术大学、哥本哈根大学从事研究工作。2013年入职华中科技大学，主要从事低维系统中电荷、能量输运及统计性质的理论与计算研究。