Transferrable dielectric DBR membranes for versatile GaN-based polariton and VCSEL technology
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 a...
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Veröffentlicht in: | Microelectronic engineering 2020-05, Vol.228, p.111276, Article 111276 |
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Sprache: | eng |
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Zusammenfassung: | 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.
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•Innovative process to fabricate high-quality transferrable oxide DBR membranes.•Large reflectivity values and wide stop-band with only 4-pair DBRs.•Observation of pronounced cavity mode in λ/2 oxide cavities using transferred DBRs.•Realization of state-of-the art 3λ/2 GaN-based polariton microcavities. |
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ISSN: | 0167-9317 1873-5568 |
DOI: | 10.1016/j.mee.2020.111276 |