Caltech Nanofabrication Group

  • Increase font size
  • Default font size
  • Decrease font size
Home Publications

From Vertical-Cavities to Hybrid Metal/Photonic-Crystal Nanocavities: Towards High-Efficiency Nanolasers

Research Area: Nanophotonics Year: 2012
Type of Publication: Article Keywords: lasers, hybrid lasers, VCSEL, photonic crystal, nanophotonics, plasmonics, microcavities, threshold
Authors: Kim, Se-Heon; Huang, Jingqing; Scherer, Axel
Journal: Journal of the Optical Society of America B Volume: 29
Number: 4 Pages: 577-588
Month: April
Abstract:
We provide a numerical study showing that a bottom reflector is indispensable to achieve unidirectional emission from a photonic-crystal (PhC) nanolaser. First, we study a PhC slab nanocavity suspended over a flat mirror formed by a dielectric or metal substrate. We find that the laser’s vertical emission can be enhanced by more than a factor of 6 compared with the device in the absence of the mirror. Then, we study the situation where the PhC nanocavity is in contact with a flat metal surface. The underlying metal substrate may serve as both an electrical current pathway and a heat sink, which would help achieve continuous-wave lasing operation at room temperature. The design of the laser emitting at 1.3 μm reveals that a relatively high cavity Q of over 1000 is achievable assuming room-temperature gold as a substrate. Furthermore, linearly polarized unidirectional vertical emission with the radiation efficiency over 50% can be achieved. Finally, we discuss how this hybrid design relates to various plasmonic cavities and propose a useful quantitative measure of the degree of the “plasmonic” character in a general metallic nanocavity.
Full text:
PDF: Caltech only
Online version (publisher)

Contact

Administrative and Financial Contact

Kate Finigan
MC 200-79, Caltech
1200 E California Blvd
Pasadena, CA 91125

Office:  215 Powell-Booth
Phone:  626.395.4585
Fax: 626.577.8442
Email: kate@caltech.edu

Login