声子
碳化硅
表面声子
材料科学
极化子
热导率
凝聚态物理
色散(光学)
驻波
光电子学
光学
物理
复合材料
作者
Andrea Mancini,Nan Lin,Fedja J. Wendisch,Rodrigo Berté,Haoran Ren,Emiliano Cortés,Stefan A. Maier
出处
期刊:ACS Photonics
[American Chemical Society]
日期:2022-10-20
卷期号:9 (11): 3696-3704
被引量:2
标识
DOI:10.1021/acsphotonics.2c01270
摘要
Surface phonon polaritons (SPhPs) are mixed light-matter states originating from strong coupling of photons with lattice vibrations. Thin films of polar dielectrics feature a splitting of the SPhP branch due to the hybridization of the top and bottom interface modes. Recently, enhanced in-plane thermal conductivity and near-field energy transfer have been experimentally demonstrated in free-standing polar films. These effects are determined by the SPhP dispersion in these systems, which, however, is yet to be reported experimentally. In this work, we retrieve the SPhP dispersion in silicon carbide free-standing membranes few hundreds of nanometers thick through near-field spectroscopy. We find several branches in the experimental dispersion, which we rationalize as multiple reflections of tip and edge launched SPhPs, in good agreement with theoretical predictions. Our work paves the way to employ large-area free-standing membranes as a platform for phonon polaritonics, with foreseeable applications in the field of thermal management at the nanoscale.
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