Reduction of facet reflectivity of quantum-cascade lasers with subwavelength gratings

Afusat O. Dirisu, Grace Silva, Zhijun Liu, Claire F. Gmachl, Fred J. Towner, John Bruno, Deborah L. Sivco

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We demonstrate the reduction of the facet reflectivity of quantum-cascade lasers (QCLs) by using subwavelength gratings. The gratings were fabricated on λ = 4:9- and 9:8-μm QCLs using focused ion beam milling. Reflectivities as low as 1%-3% for the 4.9-μm QCL and as low as 4%-8% for the 9.8-μm QCL are reported.

Original languageEnglish (US)
Pages (from-to)221-223
Number of pages3
JournalIEEE Photonics Technology Letters
Volume19
Issue number4
DOIs
StatePublished - Feb 15 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

Keywords

  • Antireflection (AR)
  • Grating
  • Midinfrared
  • Quantum-cascade lasers (QCLs)

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