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Title: Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers

Abstract

We demonstrate a scheme for controlled switching of polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers (spin-VCSEL). Under hybrid electrical and optical pumping conditions, our VCSEL devices show polarization oscillations with frequencies far above the VCSEL's electrical modulation bandwidth. Using multiple optical pulses, we are able to excite and amplify these polarization oscillations. When specific phase and amplitude conditions for the optical excitation pulses are met, destructive interference leads to switch-off of the polarization oscillation, enabling the generation of controlled short polarization bursts.

Authors:
; ; ;  [1]
  1. Photonics and Terahertz Technology, Ruhr-University Bochum, D-44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
22275728
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 2; Other Information: (c) 2014 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; LASERS; OPTICAL PUMPING; OSCILLATIONS; POLARIZATION; SPIN; SPIN ORIENTATION; SWITCHES

Citation Formats

Höpfner, Henning, E-mail: henning.hoepfner@rub.de, Lindemann, Markus, Gerhardt, Nils C., and Hofmann, Martin R.. Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers. United States: N. p., 2014. Web. doi:10.1063/1.4862330.
Höpfner, Henning, E-mail: henning.hoepfner@rub.de, Lindemann, Markus, Gerhardt, Nils C., & Hofmann, Martin R.. Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers. United States. doi:10.1063/1.4862330.
Höpfner, Henning, E-mail: henning.hoepfner@rub.de, Lindemann, Markus, Gerhardt, Nils C., and Hofmann, Martin R.. Mon . "Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers". United States. doi:10.1063/1.4862330.
@article{osti_22275728,
title = {Controlled switching of ultrafast circular polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers},
author = {Höpfner, Henning, E-mail: henning.hoepfner@rub.de and Lindemann, Markus and Gerhardt, Nils C. and Hofmann, Martin R.},
abstractNote = {We demonstrate a scheme for controlled switching of polarization oscillations in spin-polarized vertical-cavity surface-emitting lasers (spin-VCSEL). Under hybrid electrical and optical pumping conditions, our VCSEL devices show polarization oscillations with frequencies far above the VCSEL's electrical modulation bandwidth. Using multiple optical pulses, we are able to excite and amplify these polarization oscillations. When specific phase and amplitude conditions for the optical excitation pulses are met, destructive interference leads to switch-off of the polarization oscillation, enabling the generation of controlled short polarization bursts.},
doi = {10.1063/1.4862330},
journal = {Applied Physics Letters},
number = 2,
volume = 104,
place = {United States},
year = {Mon Jan 13 00:00:00 EST 2014},
month = {Mon Jan 13 00:00:00 EST 2014}
}
  • We report the experimental observation of circular polarization switching (PS) and polarization bistability (PB) in a 1300 nm dilute nitride spin-vertical cavity surface emitting laser (VCSEL). We demonstrate that the circularly polarized optical signal at 1300 nm can gradually or abruptly switch the polarization ellipticity of the spin-VCSEL from right-to-left circular polarization and vice versa. Moreover, different forms of PS and PB between right- and left-circular polarizations are observed by controlling the injection strength and the initial wavelength detuning. These results obtained at the telecom wavelength of 1300 nm open the door for novel uses of spin-VCSELs in polarization sensitive applications in futuremore » optical systems.« less
  • We propose a strategy to performing ultrafast directional beam switching using two coupled vertical-cavity surface-emitting lasers (VCSELs). The proposed strategy is demonstrated for two VCSELs of 5.6 {mu}m in diameter placed about 1 {mu}m apart from the edges, showing a switching speed of 42 GHz with a maximum far-field angle span of about 10{degree}. {copyright} 2001 American Institute of Physics.
  • Polarization selection in small-area vertical-cavity surface-emitting lasers is studied experimentally in dependence of injection current and substrate temperature in the vicinity of the minimum threshold condition. Polarization switching from the low to the high frequency fundamental spatial mode is demonstrated. The effective birefringence displays a minimum in the transition region. The observation of dynamical transition states hints to the relevance of nonlinear effects. A comparison to the predictions of the San Miguel{endash}Feng{endash}Moloney model based on phase-amplitude coupling is given. {copyright} 2001 American Institute of Physics.
  • Switching between linearly polarized states of slightly different optical frequencies with the same transverse-mode pattern is found, as the injection current is increased. Switchings found here for semiconductor rate-equation models incorporating a vector electric field, birefringence, and the {alpha} factor are similar to previously reported experimental results. {copyright} {ital 1996 Optical Society of America.}
  • Starting from a fully microscopic spin-flip model for a vertical cavity surface emitting laser, we derive a macroscopic model that includes the frequency dependence of the complex gain and the gain nonlinearities due to spectral hole burning. The macroscopic model reproduces well the predictions of the microscopic one. The gain nonlinearities affect especially the switching from the higher to the lower frequency, and their effects are more manifest when the spin-flip rate is large.