Abstract

The fabrication of nanoporous (NP) GaN is proposed as a generic technique to create out-of-plane index guiding for nitride microcavities. Compared to the conventional undercut technique, the proposed technique forms uniformly a low-index NP-GaN layer beneath the entire microcavity. Therefore, it supports all cavity modes (with different cavity geometries), while the undercut technique only supports the modes that reside at the circumference of a circular microcavity. As a proof of concept, GaN microdisk cavities were fabricated with the NP-GaN as the bottom low-index medium. A cold cavity with Q>2,000 was reported under continuous-wave pumping. Lasing was demonstrated with threshold optical pumping power Pth60  kW/cm2 for the r=10  μm microdisk and Pth7  kW/cm2 for the r=50  μm microdisk. A rate equation analysis was performed to estimate the spontaneous coupling factor β1E-3, which was one order of magnitude higher than the previous report of a nitride microdisk laser with an InGaN quantum well active region. Therefore, NP GaN was proven to be a suitable replacement of the undercut technique for future nitride microcavities applications.

© 2018 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Electrical injection of a 440nm InGaN laser with lateral confinement by nanoporous-GaN

Ryan Anderson, Daniel Cohen, Shlomo Mehari, Shuji Nakamura, and Steven DenBaars
Opt. Express 27(16) 22764-22769 (2019)

Optical properties and resonant cavity modes in axial InGaN/GaN nanotube microcavities

P. -M. Coulon, J. R. Pugh, M. Athanasiou, G. Kusch, E. D. Le Boulbar, A. Sarua, R. Smith, R. W. Martin, T. Wang, M. Cryan, D. W. E. Allsopp, and P. A. Shields
Opt. Express 25(23) 28246-28257 (2017)

Enabling area-selective potential-energy engineering in InGaN/GaN quantum wells by post-growth intermixing

Chao Shen, Tien Khee Ng, and Boon S. Ooi
Opt. Express 23(6) 7991-7998 (2015)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription