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Title: Frequency tuning of polarization oscillations: Toward high-speed spin-lasers

Spin-controlled vertical-cavity surface-emitting lasers (spin-VCSELs) offer a high potential to overcome several limitations of conventional purely charged-based laser devices. Presumably, the highest potential of spin-VCSELs lies in their ultrafast spin and polarization dynamics, which can be significantly faster than the intensity dynamics in conventional devices. Here, we experimentally demonstrate polarization oscillations in spin-VCSELs with frequencies up to 44 GHz. The results show that the oscillation frequency mainly depends on the cavity birefringence, which can be tuned by applying mechanical strain to the VCSEL structure. A tuning range of about 34 GHz is demonstrated. By measuring the polarization oscillation frequency and the birefringence governed mode splitting as a function of the applied strain simultaneously, we are able to investigate the correlation between birefringence and polarization oscillations in detail. The experimental findings are compared to numerical calculations based on the spin-flip model.
Authors:
; ;  [1] ; ;  [2]
  1. Photonics and Terahertz Technology, Ruhr-University Bochum, 44780 Bochum (Germany)
  2. Institute of Optoelectronics, Ulm University, 89081 Ulm (Germany)
Publication Date:
OSTI Identifier:
22489366
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 4; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BIREFRINGENCE; CORRELATIONS; GHZ RANGE 01-100; LASERS; OSCILLATIONS; POLARIZATION; SPIN; SPIN FLIP; STRAINS; SURFACES; TUNING