Hybrid VCSEL: liquid crystal systems

K. Panajotov; Y. Xie; J. Beeckman; K. Neyts; M. Dems; C. Belmonte; H. Thienpont

doi:10.1117/12.2079032

4 March 2015 Hybrid VCSEL: liquid crystal systems

K. Panajotov, Y. Xie, J. Beeckman, K. Neyts, M. Dems, C. Belmonte, H. Thienpont

Proceedings Volume 9381, Vertical-Cavity Surface-Emitting Lasers XIX; 93810P (2015) https://doi.org/10.1117/12.2079032
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We study theoretically and experimentally spectral and polarization characteristics of hybrid systems of VCSELs integrated within liquid crystal (LC) cells. Three cases are considered: Nematic or cholesteric LC on top of VCSEL, coupled-cavity system with the second cavity next to the VCSEL’s one filled in with nematic LC and a system with a nematic LC inside the VCSEL cavity. For the case of nematic liquid crystal - VCSEL coupled cavity system we demonstrate selection between two orthogonal directions of linear polarization of the fundamental mode by changing the LC length or by electro-optical tuning of the LC director. For the case of cholesteric liquid crystal-VCSEL system we demonstrate lasing on circularly polarized (CP) modes due to the LC band gap for CP light. The transition from nematic to isotropic phase of the LC when increasing temperature leads to a drastic change of the polarization of the generated light from left-handed circular to linear polarization. Finally, we investigate the possibility of efficient wavelength tuning by utilizing electrooptical effect in nematic LC layer integrated next to the active region in a VCSEL cavity.

Citation Download Citation

K. Panajotov, Y. Xie, J. Beeckman, K. Neyts, M. Dems, C. Belmonte, and H. Thienpont "Hybrid VCSEL: liquid crystal systems", Proc. SPIE 9381, Vertical-Cavity Surface-Emitting Lasers XIX, 93810P (4 March 2015); https://doi.org/10.1117/12.2079032

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KEYWORDS

Liquid crystals

Vertical cavity surface emitting lasers

Polarization

Electro optics

Glasses

Dielectric polarization

Switching

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