Nitrides Seminar - Ryan Anderson

Nitrides Seminar

Thursday,March 3,2022, 12:00PM

Attend in person at ESB 1001!

Zoom option also available
https://ucsb.zoom.us/j/83773735118?pwd=K1h5Q1lQbW9UeklrU0ttWFk0ekZhdz09

Meeting ID: 837 7373 5118                        Passcode: 460716

Ryan Anderson
Graduate Student Researcher, DenBaars Group

University of California, Santa Barbara

Nano-Porous GaN in Edge Emitting Laser Diodes

Ryan Anderson, Haojun Zhang, Emily Trageser, Dan Cohen, Steven DenBaars

Materials Department, University of California, Santa Barbara, California, USA

GaN based edge emitting laser diodes typically use AlGaN or InGaN for index contrast and mode confinement in waveguide cladding layers. Though growing on GaN semi-polar planes is expected to supply higher gain than the conventional c-plane, the formation of misfit dislocations on these planes limits the possible AlGaN/InGaN thickness and composition. High composition AlGaN can also lead to higher voltage operation and reduced lifetime. Nano-porous GaN is a lattice matched, high index contrast material that has recently been investigated as a replacement to AlGaN and InGaN for optical confinement. This opens up new design possibilities to improve power and efficiency in edge emitters, especially at longer wavelength emission.

Electrically injected lasers have been fabricated using nano-porous cladding for blue and green emission wavelengths. Optical loss due to scattering at pores will be discussed as limiting power and efficiency of the fabricated blue lasers. Green lasers have shown comparable performance to traditional green LDs from this group, with lower power but improved operating voltage, serving as a stepping stone to broadening applicable wavelengths of III-N LDs.

HOST: Dr. Tal Margalith