Paper published in Optics Letters

Our paper ‘High frequency continuous birefringence-induced oscillations in spin-polarized vertical-cavity surface-emitting lasers”, has been published in Optics Letters.

This work is the result of a collaboration between the Institute of Photonics at the University of Strathclyde (Glasgow, UK), the University of Essex (UK) and the Institute de Fisica Arroyo Seco (Tandil, Argentina).

Paper details are as follows:

Title: ‘High frequency continuous birefringence-induced oscillations in spin-polarized vertical-cavity surface-emitting lasers’

Authors: M. S. Torre, H. Susanto, Nianqiang Li, K. Schires, M. F. Salvide, I. D. Henning, M. J. Adams and A. Hurtado

Abstract: Sustained, large amplitude and tuneable birefringenceinduced oscillations are obtained in a spin-Vertical Cavity Surface Emitting Laser (spin-VCSEL). Experimental evidence is provided using a spin-VCSEL operating at 1300 nm, under continuous wave optical pumping and at room temperature. Numerical and stability analyses are performed to interpret the experiments and to identify the combined effects of pump ellipticity, spin relaxation rate and cavity birefringence. Importantly, the frequency of the induced oscillations is determined by the device’s birefringence rate which can be tuned to very large values. This opens the path for ultrafast spin-lasers operating at record frequencies exceeding those possible in traditional semiconductor lasers and with ample expected impact in disparate disciplines (e.g. datacomms, spectroscopy).

Journal: Optics Letters (Vol. 42, Issue 8, pp. 1628-1631, 2017)

Paper published in Applied Physics Letters

Our article “Control of emitted light polarization in a 1310 nm dilute nitride spin-vertical cavity surface emitting laser subject to circularly polarized optical injection“ has been published in Applied Physics Letters (American Institute of Physics). The article can be accesed in the following link or through the Applied Physics Letters’ website.

Paper details:
Title: Control of emitted light polarization in a 1310 nm dilute nitride spin-vertical cavity surface emitting laser subject to circularly polarized optical injection
Authors: S. S. Alharthi, A. Hurtado, R. K. Al Seyab, V.-M. Korpijarvi, M. Guina, I. D. Henning and M. J. Adams
Abstract: We experimentally demonstrate the control of the light polarization emitted by a 1310 nm dilute nitride spin-Vertical Cavity Surface Emitting Laser (VCSEL) at room temperature. This is achieved by means of a combination of polarized optical pumping and polarized optical injection. Without external injection, the polarization of the optical pump controls that of the spin-VCSEL. However, the addition of the externally injected signal polarized with either left- (LCP) or right-circular polarization (RCP) is able to control the polarization of the spin-VCSEL switching it at will to left- or right-circular polarization. A numerical model has been developed showing a very high degree of agreement with the experimental findings.

Works presented at CLEO Conference, San Jose, CA, 8-13 June 2014

The following works have been recently presented at the Conference on Lasers and Electrooptics, CLEO 2014, held in San Jose (USA) from the 8th to the 13th of June 2014:

ABSTRACT ID: SW1G.3
TITLE: Gallium Nitride Nanotube Lasers
AUTHORS: Changyi Li¹, Antonio Hurtado², Jeremy B. Wright^{1, 3}, Huiwen Xu¹, Sheng Liu^{3, 4}, Ting S. Luk^{3, 4}, Igal Brener^{3, 4}, Steven R. Brueck¹, George T. Wang³
INSTITUTIONS: 1. Center for High Technology Materials, University of New Mexico, Albuquerque, NM, USA. 2. School of Computer Science and Electronic Engineering, University of Essex, Colchester, UK. 3. Sandia National Laboratories, Albuquerque, NM, USA. 4. Center for Integrated Nanotechnology, Sandia National Laboratories, Albuquerque, NM, USA.
ABSTRACT: Lasing is demonstrated from gallium nitride nanotubes fabricated using a two-step top-down technique. By optically pumping, we observed characteristics of lasing: a clear threshold, a narrow spectral, and guided emission from the nanotubes.

 

ABSTRACT FINAL ID: SF1G.7
TITLE: Control of the Emitted Polarization in a 1310 nm spin-VCSEL Subject to Circularly Polarized Optical Injection
AUTHORS: Sami Alharthi¹, Antonio Hurtado¹, Ville-Markus Korpijärvi², Mircea Guina², Ian Hening¹, Michael Adams¹
INSTITUTIONS: 1. Computer Science and Electronic Engineering, University of Essex, Colchester, United Kingdom. 2. Optoelectronics Research Centre (ORC), Tampere University of Technology, Tampere, Finland.
ABSTRACT: We report the first optical injection experiment on a dilute nitride 1300 nm spin-VCSEL at room temperature. Effective control of the polarization of the light emitted by the spin-VCSEL is theoretically predicted and experimentally demonstrated.