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Title: Unidirectional photonic wire laser

Photonic wire lasers are a new genre of lasers that have a transverse dimension much smaller than the wavelength. Unidirectional emission is highly desirable as most of the laser power will be in the desired direction. Owing to their small lateral dimension relative to the wavelength, however, the mode mostly propagates outside the solid core. Consequently, conventional approaches to attach a highly reflective element to the rear facet, whether a thin film or a distributed Bragg reflector, are not applicable. In this paper, we propose a simple and effective technique to achieve unidirectionality. Terahertz quantum-cascade lasers with distributed feedback (DFB) were chosen as the platform of the photonic wire lasers. Unidirectionality is achieved with a power ratio of the forward/backward of about eight, and the power of the forward-emitting laser is increased by a factor of 1.8 compared with a reference bidirectional DFB laser. Finally and furthermore, we achieved a wall plug power efficiency of ~1%.
 [1] ;  [2] ;  [3] ;  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Electrical Engineering and Computer Science. Research Lab. of Electronics
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center of Integrated Nanotechnologies
  3. Univ. of Toronto, ON (Canada). Dept. of Electrical Engineering and Computer Science
Publication Date:
Report Number(s):
Journal ID: ISSN 1749-4885; nphoton.2017.129
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Nature Photonics
Additional Journal Information:
Journal Volume: 11; Journal Issue: 9; Journal ID: ISSN 1749-4885
Nature Publishing Group
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC)
Country of Publication:
United States
47 OTHER INSTRUMENTATION; quantum cascade lasers; solid-state lasers
OSTI Identifier: