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Optical microprism cavities based on dislocation-free GaN

Hjort, Filip ; Khalilian, Maryam LU ; Bengtsson, Jörgen ; Bengths, Marcus ; Gustavsson, Johan ; Gustafsson, Anders LU orcid ; Samuelson, Lars LU and Haglund, Åsa (2020) In Applied Physics Letters 117(23).
Abstract
Three-dimensional growth of nanostructures can be used to reduce the threading dislocation density that degrades III-nitride laser performance. Here, nanowire-based hexagonal GaN microprisms with flat top and bottom c-facets are embedded between two dielectric distributed Bragg reflectors to create dislocation-free vertical optical cavities. The cavities are electron beam pumped, and the quality (Q) factor is deduced from the cavity-filtered yellow luminescence. The Q factor is ∼500 for a 1000 nm wide prism cavity and only ∼60 for a 600 nm wide cavity, showing the strong decrease in Q factor when diffraction losses become dominant. Measured Q factors are in good agreement with those obtained from quasi-3D finite... (More)
Three-dimensional growth of nanostructures can be used to reduce the threading dislocation density that degrades III-nitride laser performance. Here, nanowire-based hexagonal GaN microprisms with flat top and bottom c-facets are embedded between two dielectric distributed Bragg reflectors to create dislocation-free vertical optical cavities. The cavities are electron beam pumped, and the quality (Q) factor is deduced from the cavity-filtered yellow luminescence. The Q factor is ∼500 for a 1000 nm wide prism cavity and only ∼60 for a 600 nm wide cavity, showing the strong decrease in Q factor when diffraction losses become dominant. Measured Q factors are in good agreement with those obtained from quasi-3D finite element frequency-domain method and 3D beam propagation method simulations. Simulations further predict that a prism cavity with a 1000 nm width will have a Q factor of around 2000 in the blue spectral regime, which would be the target regime for real devices. These results demonstrate the potential of GaN prisms as a scalable platform for realizing small footprint lasers with low threshold currents. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Applied Physics Letters
volume
117
issue
23
article number
231107
pages
8 pages
publisher
American Institute of Physics (AIP)
ISSN
1077-3118
DOI
10.1063/5.0032967
language
English
LU publication?
yes
id
7bb56a24-a7f7-4d50-b3ae-b6425ceed3a1
date added to LUP
2021-02-01 13:44:11
date last changed
2025-04-04 14:15:10
@article{7bb56a24-a7f7-4d50-b3ae-b6425ceed3a1,
  abstract     = {{Three-dimensional growth of nanostructures can be used to reduce the threading dislocation density that degrades III-nitride laser performance. Here, nanowire-based hexagonal GaN microprisms with flat top and bottom c-facets are embedded between two dielectric distributed Bragg reflectors to create dislocation-free vertical optical cavities. The cavities are electron beam pumped, and the quality (<i>Q</i>) factor is deduced from the cavity-filtered yellow luminescence. The <i>Q</i> factor is ∼500 for a 1000 nm wide prism cavity and only ∼60 for a 600 nm wide cavity, showing the strong decrease in <i>Q</i> factor when diffraction losses become dominant. Measured <i>Q</i> factors are in good agreement with those obtained from quasi-3D finite element frequency-domain method and 3D beam propagation method simulations. Simulations further predict that a prism cavity with a 1000 nm width will have a <i>Q</i> factor of around 2000 in the blue spectral regime, which would be the target regime for real devices. These results demonstrate the potential of GaN prisms as a scalable platform for realizing small footprint lasers with low threshold currents.}},
  author       = {{Hjort, Filip and Khalilian, Maryam and Bengtsson, Jörgen and Bengths, Marcus and Gustavsson, Johan and Gustafsson, Anders and Samuelson, Lars and Haglund, Åsa}},
  issn         = {{1077-3118}},
  language     = {{eng}},
  month        = {{12}},
  number       = {{23}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Applied Physics Letters}},
  title        = {{Optical microprism cavities based on dislocation-free GaN}},
  url          = {{http://dx.doi.org/10.1063/5.0032967}},
  doi          = {{10.1063/5.0032967}},
  volume       = {{117}},
  year         = {{2020}},
}