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

Boztuğ Yerci Ç. H., Sanchez-Perez J. R., Yin J., Lagally M. G., Paiella R.

APPLIED PHYSICS LETTERS, cilt.103, sa.20, 2013 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 103 Sayı: 20
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1063/1.4830377
  • Dergi Adı: APPLIED PHYSICS LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • TED Üniversitesi Adresli: Hayır

Özet

Mechanically stressed nanomembranes are used to demonstrate mid-infrared interband light emission from Ge within the 2.1-2.5 mu m 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. (C) 2013 AIP Publishing LLC.