Enhancement of terahertz emission of semi-insulating gallium arsenide via zinc oxide thin film surface modification

  • Archel Susvilla Escaro National Institute of Physics, University of the Philippines Diliman
  • Erick John Carlo Solibet National Institute of Physics, University of the Philippines Diliman
  • Raymund Veloz National Institute of Physics, University of the Philippines Diliman
  • Neil Irvin Cabello National Institute of Physics, University of the Philippines Diliman
  • Miguel Bacaoco National Institute of Physics, University of the Philippines Diliman
  • Lorenzo Lopez, Jr. National Institute of Physics, University of the Philippines Diliman
  • Maria Angela Faustino National Institute of Physics, University of the Philippines Diliman
  • Alexander De Los Reyes National Institute of Physics, University of the Philippines Diliman
  • Arven Cafe National Institute of Physics, University of the Philippines Diliman
  • Elmer Estacio National Institute of Physics, University of the Philippines Diliman
  • Armando Somintac National Institute of Physics, University of the Philippines Diliman
  • Arnel Salvador National Institute of Physics, University of the Philippines Diliman
Keywords: Antireflection coatings 42.79.Wc, Ultrafast spectroscopy 78.47.J, Ultrafast processes 42.65.Re, Spray coating techniques 81.15.Rs

Abstract

This study reports on the Terahertz (THz) emission of semi-insulating Gallium Arsenide (GaAs) substrate coated with Zinc Oxide (ZnO) thin film via spray pyrolysis. Using a reflection-mode THZ time domain spectroscopy (TDS), it was shown  that enhancement in the THZ emission was observed with ZnO-coated SI-GaAs compared to the bare substrate. The enhancement is partly attributed to the decreased reflectivity due to the  modification of the surface by addition of a ZnO thin film on the GaAs substrate which translates to higher photon absorbance of the material. 

Published
2017-06-07
Section
Poster Session A (Experimental Materials Science and Photonics)