skip to main content

SciTech ConnectSciTech Connect

Title: Grating-coupled mid-infrared light emission from tensilely strained germanium nanomembranes

Mechanically stressed nanomembranes are used to demonstrate mid-infrared interband light emission from Ge within the 2.1–2.5 μm atmospheric transmission window. Large biaxial tensile strain is introduced in these samples to convert Ge into a (near-) direct-bandgap semiconductor and to red-shift its luminescence. A diffractive array of Ge pillars is used to outcouple the long-wavelength interband radiation, which is otherwise primarily emitted in the sample plane. An order-of-magnitude strain-induced enhancement in radiative efficiency is also reported, together with the observation of luminescence signatures associated with photonic-crystal cavity modes. These results are promising for the development of silicon-compatible lasers for mid-infrared optoelectronics applications.
Authors:
; ;  [1] ; ;  [2]
  1. Department of Electrical and Computer Engineering and Photonics Center, Boston University, 8 Saint Mary's Street, Boston, Massachusetts 02215 (United States)
  2. Department of Materials Science and Engineering, University of Wisconsin–Madison, 1509 University Ave., Madison, Wisconsin 53706 (United States)
Publication Date:
OSTI Identifier:
22254051
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; GERMANIUM; GRATINGS; LASERS; LUMINESCENCE; RED SHIFT; SEMICONDUCTOR MATERIALS; STRAINS; STRESSES; WAVELENGTHS