06 November 2020
America/Chicago timezone
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Searching for narrow band thermal emission in mid-infrared from phonon polaritonic metasurfaces
 
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Content: Metasurfaces, artificial optical devices, which consist of an array of two-dimensional optical antennas with subwavelength thickness and separation, can be tailored to produce gradient optical responses and shape the wave fronts of scattered light. The polaritonic metasurfaces used in this work, are comprised of polar dielectrics and metal-dielectric multilayers patterns. The excitation of surface phonon polariton modes in the mid-infrared are confined metal-dielectric nanostructures and shows a very strong resonance with low optical power loss. The purpose of the study is to investigate a well-defined and narrow-band thermal emission from surface phonon polaritonic metasurfaces in the optical phonon band of silicon carbide (SiC) in the mid-infrared wavelength of 10–12 microns. Recently, we obtained single, controllable, and strong localized polariton resonances of these optical devices. We expect to observe thermal emission according to Kirchhoff’s law stating that a good absorber is a good emitter in thermal equilibrium. We built a home-made thermal emission measurement setup. A thermoelectric pad used to heat the metasurface device. To maximize the collection of thermal radiation from metasurface device, we used ZnSe objective lens and thermal emission data is taken by using a Fourier Transform Infrared Spectrometer. The thermal emission device will be used to construct novel thermal metasurfaces.
Id: 17
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Starting date:
06-Nov-2020   11:30 (America/Chicago)
Duration: 05'
Primary Authors: Mr. AHMAD, Imtiaz (Department of Physics and Astronomy, Texas Tech University)
Co-Authors: Mr. KACHIRAJU, Satya (Department of Physics and Astronomy, Texas Tech University)
Prof. KIM, Myoung-Hwan (Texas Tech University)
Presenters: Mr. AHMAD, Imtiaz
Material: poster Poster
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