High reflectivity YDH/SiO2 distributed Bragg reflector for UV-C wavelength regime

Mohd Sharizal Alias, Abdullah Alatawi, Ka Chun Wong, Malleswararao Tangi, Jorge Alberto Holguin Lerma, Edgars Stegenburgs, Mohammad Khaled Shakfa, Tien Khee Ng, Abdul Rahman, Ahmed Alyamani, Boon S. Ooi

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A distributed Bragg reflector (DBR) composed of Y2O3-doped HfO2 (YDH)/SiO2 layers with high reflectivity spectrum centered at a wavelength of ~240 nm is deposited using radio-frequency magnetron sputtering. Before the DBR deposition, optical properties for a single layer of YDH, SiO2, and HfO2 thin films were studied using spectroscopic ellipsometry and spectrophotometry. To investigate the performance of YDH as a material for the high refractive index layer in the DBR, a comparison of its optical properties was made with HfO2 thin films. Due to larger optical bandgap, the YDH thin films demonstrated higher transparency, lower extinction coefficient, and lower absorption coefficient in the UV-C regime (especially for wavelengths below 250 nm) compared to the HfO2 thin films. The deposited YDH/SiO2 DBR consisting of 15 periods achieved a reflectivity higher than 99.9% at the wavelength of ~240 nm with a stopband of ~50 nm. The high reflectivity and broad stopband of YDH/SiO2 DBRs will enable further advancement of various photonic devices such as vertical-cavity surface-emitting lasers, resonant-cavity light-emitting diodes, and resonant-cavity photodetectors operating in the UV-C wavelength regime.
Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalIEEE Photonics Journal
Volume10
Issue number2
DOIs
StatePublished - Feb 15 2018

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