Dynamical Tuning of Nanowire Lasing Spectra

Research output: Contribution to journalArticle

Abstract

Realizing visionary concepts of integrated photonic circuits, nanospectroscopy, and nanosensing will tremendously benefit from dynamically tunable coherent light sources with lateral dimensions on the subwavelength scale. Therefore, we demonstrate an individual nanowire laser based device which can be gradually tuned by reversible length changes of the nanowire such that uniaxial tensile stress is applied to the respective semiconductor gain material. By straining the device, the spontaneous excitonic emission of the nanowire shifts to lower energies caused by the bandgap reduction of the semiconductor. Moreover, the optical gain spectrum of the nanolaser can be precisely strain-tuned in the high excitation regime. The tuning of the emission does not affect the laser threshold of the device, which is very beneficial for practical applications. The applied length change furthermore adjusts the laser resonances inducing a redshift of the longitudinal modes. Thus, this concept of gradually and dynamically tunable nanolasers enables controlling and modulating the coherent emission on the nanoscale without changing macroscopic ambient conditions. This concept holds therefore huge impact on nanophotonic switches and photonic circuit technology.

Details

Authors
  • Maximilian Zapf
  • Robert Röder
  • Karl Winkler
  • Lisa Kaden
  • Johannes Greil
  • Marcel Wille
  • Marius Grundmann
  • Rüdiger Schmidt-Grund
  • Alois Lugstein
  • Carsten Ronning
Organisations
External organisations
  • Friedrich Schiller University Jena
  • Vienna University of Technology
  • Leipzig University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Nano Technology

Keywords

  • bandgap modification, cadmium sulfide, emission tuning, lasing, Nanowire, strain
Original languageEnglish
Pages (from-to)6637-6643
Number of pages7
JournalNano Letters
Volume17
Issue number11
Publication statusPublished - 2017 Nov 8
Publication categoryResearch
Peer-reviewedYes