Influence of substrate effect on near-field radiative modulator based on biaxial hyperbolic materials  

作　　者：刘睿一 刘皓佗 胡杨 崔峥 吴小虎 Ruiyi Liu;Haotuo Liu;Yang Hu;Zheng Cui;Xiaohu Wu(Institute of Advanced Technology,Shandong University,Jinan 250061,China;Shandong Institute of Advanced Technology,Jinan 250100,China;School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]Institute of Advanced Technology,Shandong University,Jinan 250061,China [2]Shandong Institute of Advanced Technology,Jinan 250100,China [3]School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China

出　　处：《Chinese Physics B》2024年第4期56-64,共9页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.52106099);the Natural Science Foundation of Shandong Province of China (Grant No.ZR2022YQ57);the Taishan Scholars Program。

摘　　要：Relative rotation between the emitter and receiver could effectively modulate the near-field radiative heat transfer(NFRHT)in anisotropic media.Due to the strong in-plane anisotropy,natural hyperbolic materials can be used to construct near-field radiative modulators with excellent modulation effects.However,in practical applications,natural hyperbolic materials need to be deposited on the substrate,and the influence of substrate on modulation effect has not been studied yet.In this work,we investigate the influence of substrate effect on near-field radiative modulator based onα-MoO_(3).The results show that compared to the situation without a substrate,the presence of both lossless and lossy substrate will reduce the modulation contrast(MC)for different film thicknesses.When the real or imaginary component of the substrate permittivity increases,the mismatch of hyperbolic phonon polaritons(HPPs)weakens,resulting in a reduction in MC.By reducing the real and imaginary components of substrate permittivity,the MC can be significantly improved,reaching 4.64 forε_(s)=3 at t=10 nm.This work indicates that choosing a substrate with a smaller permittivity helps to achieve a better modulation effect,and provides guidance for the application of natural hyperbolic materials in the near-field radiative modulator.

关 键 词：near-field radiative modulator substrate effect hyperbolic material modulation contrast 

分 类 号：TN761[电子电信—电路与系统]