Plasmonically Enhanced Thermal Radiation by Means of Surface Phonon Polaritons
Plasmonically Enhanced Thermal Radiation by Means of Surface Phonon Polaritons
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DOI：
10.1103/physrevapplied.14.064013
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发表时间：
2020-12-03
影响因子：
4.6
通讯作者：
Chen, Renkun
中科院分区：
文献类型：
--
作者：
Shin, Sunmi;Chen, Renkun
纳米尺度下的辐射传热具有产生与块体材料不同的光谱特征和强度的热辐射的潜力。具体来说，使用表面声子极化激元（SPhPs）耦合光子和声子的能量状态的想法模糊了光和热之间的边界，为通过光子工程操纵热传递开辟了一条道路，并打破了普朗克定律建立的经典极限。SPhPs可以在表面附近产生强烈的能量限制效应;然而，这种效应仅在狭窄的光谱范围内有效，即所谓的剩余辐射带。在这项研究中，我们采用了一种混合结构，通过耦合SPhPs和表面等离子体激元（SPPs）来拓宽热发射的有效能量范围。我们报告了显着增强的热发射的混合结构的SiO2 nanorigins装饰与Au纳米粒子的一个因素的4倍以上的裸SiO2 nanorigins。我们介绍了一种实验技术来量化复杂的纳米结构表面的发射率，使用频率相关的传热测量。它不仅使我们能够检测到来自单个纳米发射器的微弱发射，而且还同时区分了传导和辐射两种不同的热传导过程。我们的工作可能提供的见解，工程师远场热发射使用混合结构相结合的表面等离子体和声子极化激元。
Radiative heat transfer at the nanoscale has the potential to produce thermal emission with both spectral feature and intensity different from the bulk materials. Specifically, the idea of coupling the energy states of photons and phonons using surface phonon polaritons (SPhPs) blurs the boundary between light and heat, opening a path to the manipulation of heat transfer through photonic engineering and breaking the classical limit established by Planck's law. SPhPs can generate a strong energy confinement effect near the surface; however, this effect is only valid within a narrow spectral regime, the so-called reststrahlen band. In this study, we employ a hybrid structure to broaden the effective energy regime for thermal emission by coupling SPhPs and surface plasmon polaritons (SPPs). We report remarkably enhanced thermal emission of a hybrid structure made of a SiO2 nanoribbon decorated with Au nanoparticles by a factor of 4 over that of a bare SiO2 nanoribbon. We introduce an experimental technique to quantify the emissivity from the complex nanostructured surface using frequency-dependent heat-transfer measurement. Not only does it enable us to detect feeble emission from a single nanoemitter, but it also differentiates two distinct heat conducting processes of conduction and radiation, simultaneously. Our work may offer insights to engineer far-field thermal emission using hybrid structures combining the surface plasma and phonon polaritons.