Transferrable dielectric DBR membranes for versatile GaN-based polariton and VCSEL technology Article

Amargianitakis, EA, Kazazis, SA, Doundoulakis, G et al. (2020). Transferrable dielectric DBR membranes for versatile GaN-based polariton and VCSEL technology . MICROELECTRONIC ENGINEERING, 228 10.1016/j.mee.2020.111276

cited authors

  • Amargianitakis, EA; Kazazis, SA; Doundoulakis, G; Stavrinidis, G; Konstantinidis, G; Delamadeleine, E; Monroy, E; Pelekanos, NT

abstract

  • We present an innovative process to realize planar GaN microcavities, based on transferrable high-quality oxide-based Distributed-Bragg-Reflector (t-DBR) membranes. Unlike the widely used direct DBR deposition, which is not always feasible, the concept of t-DBR membranes allows their versatile use as top mirrors in all kinds of vertical-cavity surface emitting geometry devices, including light emitting diodes and lasers. The process illustrated here starts by evaporating first a 4-pair SiO2/Ta2O5 DBR centered around 400 nm on a lithographically patterned GaAs substrate. The GaAs substrate is subsequently removed by wet-etching, and the released DBR membranes are transferred onto other templates for their use as top mirrors in microcavities. By transferring a 4-pair top DBR on an 8-pair bottom SiO2/Ta2O5 DBR, a distinct cavity mode appears due to the formed λ/2 oxide cavity with a Q-factor of 110. If the 4-pair top DBR is transferred on 200 nm-thick GaN/AlGaN quantum well-containing membranes sitting on 10-pair bottom DBRs, complete all-dielectric nitride polariton structures are fabricated with pronounced strong-coupling characteristics.

publication date

  • May 1, 2020

published in

Digital Object Identifier (DOI)

volume

  • 228