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Journal Articles Optics Express Year : 2021

Whispering-gallery mode InGaN microdisks on GaN substrates

Abstract

Microdisks fabricated with III-nitride materials grown on GaN substrates are demonstrated, taking advantage of the high material quality of homoepitaxial films and advanced micro-fabrication processes. The epitaxial structure consists of InGaN/GaN multi-quantum wells (MQWs) sandwiched between AlGaN/GaN and InAlN/GaN superlattices as cladding layers for optical confinement. Due to lattice-matched growth with low dislocations, an internal quantum efficiency of ∼40% is attained, while the sidewalls of the etched 8 µm-diameter microdisks patterned by microsphere lithography are optically smooth to promote the formation of whispering-gallery modes (WGMs) within the circular optical cavities. Optically pumped lasing with low threshold of ∼5.2 mJ/cm 2 and quality (Q) factor of ∼3000 at the dominant lasing wavelength of 436.8 nm has been observed. The microdisks also support electroluminescent operation, demonstrating WGMs consistent with the photoluminescence spectra and with finite-difference time-domain (FDTD) simulations.
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Dates and versions

hal-03436102 , version 1 (19-11-2021)

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H Zi, W y Fu, F Tabataba-Vakili, H Kim-Chauveau, E Frayssinet, et al.. Whispering-gallery mode InGaN microdisks on GaN substrates. Optics Express, 2021, 29, ⟨10.1364/oe.427727⟩. ⟨hal-03436102⟩
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