Mr. Hao Wang Profile

Hao Wang

at Arizona State Univ

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Proceedings Article | 5 September 2015 Paper

High-temperature selective solar thermal absorber based on Fabry-Perot resonance cavity

Hao Wang, Liping Wang

Proceedings Volume 9559, 955907 (2015) https://doi.org/10.1117/12.2186839

KEYWORDS: Nickel, Platinum, Silica, Solar energy, Silicon, Reflectivity, Diffusion, Magnesium fluoride, Electron beams, Semiconducting wafers

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In this work, we investigate the design, fabrication and characterization of a multilayer selective solar absorber made of metallic and dielectric thin films. The investigated selective absorber exhibits theoretical spectral absorptance higher than 95% within solar spectrum and infrared emittance lower than 5%, due to the Fabry-Perot resonance and antireflection effect. In terms of fabrication, different materials are tested under high temperatures in order to obtain the structure with best thermal stability. Structures with different materials are fabricated with sputtering, chemical vapor deposition and electron beam evaporation techniques. The near normal reflectance is characterized with a Fourier Transform Infrared spectrometer for these structures before and after heat treatment. Meanwhile, Rutherford backscattering Spectroscopy is employed to analyze the diffusion and oxidation conditions during the heating process. Moreover, better material choice and fabrication techniques are considered to construct solar absorber sample with better high temperature thermal stability.

Proceedings Article | 28 August 2015 Paper

Plasmonic local heating beyond diffraction limit by the excitation of magnetic polariton

Hassan Alshehri, Hao Wang, Yanchao Ma, Liping Wang

Proceedings Volume 9547, 95472W (2015) https://doi.org/10.1117/12.2187549

KEYWORDS: Gold, Magnetism, Plasmonics, Polymers, Absorption, Dielectrics, Electromagnetism, Polymer thin films, Diffraction, Nanowires

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In recent years, optical local heating in the nanoscale has attracted great attention due to its unique features of small hot spot size and high energy density. Plasmonic local heating can provide solutions to several challenges in data storage and cancer treatment. Research conducted in this field to achieve plasmonic local heating has mainly utilized the excitation of localized surface plasmon (LSP) or surface plasmon resonance (SPR). However, achieving plasmonic local heating by the excitation of magnetic polariton (MP) has not been researched extensively yet. We numerically investigate the optical response of a nanostructure composed of a gold nanowire on a gold surface separated by a polymer spacer using the ANSYS High Frequency Structural Simulator (HFSS). The structure exhibits a strong absorption peak at the wavelength of 750 nm, and the underlying physical mechanism is verified by the local electromagnetic field distribution to be the magnetic resonance excitation. By incorporating the volume loss density due to the strong local optical energy confinement as the heat generation, nanoscale temperature distribution within the structure is numerically obtained with a thermal solver after assigning proper boundary conditions. The results show a maximum temperature of 158.5°C confined in a local area on the order of 35 nm within the ultrathin polymer layer, which clearly demonstrates the plasmonic local heating effect beyond diffraction limit by excitation of MP.

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