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VCSELs with nematic and cholesteric liquid crystal overlays

(2013) Proceedings of SPIE. 8639. p.86390A-1-86390A-8
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Abstract
We study theoretically the spectral and polarization threshold characteristics of Vertical-Cavity Surface-Emitting Lasers with nematic and cholesteric liquid crystal overlay: LC-VCSELs. In the first case, we demonstrate the possibility of selecting between two orthogonal directions of linear polarization (LP) of the fundamental mode (x or y LP) by choosing appropriate NLC length and to achieve strong polarization discrimination: threshold gain difference as large as several times the threshold gain. We also demonstrate an active control of light polarization by electro-optically tuning the LC director and show that either polarization switching between x and y LP modes or continuous change of the LP direction is possible. For cholesteric LC-VCSEL we show that it becomes a coupled system with different spectral, threshold and polarization characteristics than the ones of the stand-alone VCSEL. Due to the existence of a band gap for circularly polarized light in the liquid crystal, lasing occurs in almost circularly polarized modes at the LC side.
Keywords
BAND, electro-optic effect, Vertical-Cavity Surface-Emitting Lasers, polarization, nematic and cholesteric liquid crystals, POLARIZATION PROPERTIES, OPTICAL FEEDBACK, SHORT EXTERNAL-CAVITY, SURFACE-EMITTING LASERS, EDGE, SUBJECT

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MLA
Panajotov, Krassimir, et al. “VCSELs with Nematic and Cholesteric Liquid Crystal Overlays.” Proceedings of SPIE, edited by KD Choquette and JK Guenter, vol. 8639, SPIE, 2013, pp. 86390A-1-86390A – 8, doi:10.1117/12.2003937.
APA
Panajotov, K., Dems, M., Belmonte, C., Thienpont, H., Xie, Y., Beeckman, J., & Neyts, K. (2013). VCSELs with nematic and cholesteric liquid crystal overlays. In K. Choquette & J. Guenter (Eds.), Proceedings of SPIE (Vol. 8639, pp. 86390A-1-86390A – 8). San Francisco, CA, USA: SPIE. https://doi.org/10.1117/12.2003937
Chicago author-date
Panajotov, Krassimir, Maciej Dems, Carlos Belmonte, Hugo Thienpont, Yi Xie, Jeroen Beeckman, and Kristiaan Neyts. 2013. “VCSELs with Nematic and Cholesteric Liquid Crystal Overlays.” In Proceedings of SPIE, edited by KD Choquette and JK Guenter, 8639:86390A-1-86390A – 8. SPIE. https://doi.org/10.1117/12.2003937.
Chicago author-date (all authors)
Panajotov, Krassimir, Maciej Dems, Carlos Belmonte, Hugo Thienpont, Yi Xie, Jeroen Beeckman, and Kristiaan Neyts. 2013. “VCSELs with Nematic and Cholesteric Liquid Crystal Overlays.” In Proceedings of SPIE, ed by. KD Choquette and JK Guenter, 8639:86390A-1-86390A–8. SPIE. doi:10.1117/12.2003937.
Vancouver
1.
Panajotov K, Dems M, Belmonte C, Thienpont H, Xie Y, Beeckman J, et al. VCSELs with nematic and cholesteric liquid crystal overlays. In: Choquette K, Guenter J, editors. Proceedings of SPIE. SPIE; 2013. p. 86390A-1-86390A – 8.
IEEE
[1]
K. Panajotov et al., “VCSELs with nematic and cholesteric liquid crystal overlays,” in Proceedings of SPIE, San Francisco, CA, USA, 2013, vol. 8639, pp. 86390A-1-86390A–8.
@inproceedings{3177433,
  abstract     = {We study theoretically the spectral and polarization threshold characteristics of Vertical-Cavity Surface-Emitting Lasers with nematic and cholesteric liquid crystal overlay: LC-VCSELs. In the first case, we demonstrate the possibility of selecting between two orthogonal directions of linear polarization (LP) of the fundamental mode (x or y LP) by choosing appropriate NLC length and to achieve strong polarization discrimination: threshold gain difference as large as several times the threshold gain. We also demonstrate an active control of light polarization by electro-optically tuning the LC director and show that either polarization switching between x and y LP modes or continuous change of the LP direction is possible. For cholesteric LC-VCSEL we show that it becomes a coupled system with different spectral, threshold and polarization characteristics than the ones of the stand-alone VCSEL. Due to the existence of a band gap for circularly polarized light in the liquid crystal, lasing occurs in almost circularly polarized modes at the LC side.},
  articleno    = {86390A},
  author       = {Panajotov, Krassimir and Dems, Maciej and Belmonte, Carlos and Thienpont, Hugo and Xie, Yi and Beeckman, Jeroen and Neyts, Kristiaan},
  booktitle    = {Proceedings of SPIE},
  editor       = {Choquette, KD and Guenter, JK},
  isbn         = {9780819494085},
  issn         = {0277-786X},
  keywords     = {BAND,electro-optic effect,Vertical-Cavity Surface-Emitting Lasers,polarization,nematic and cholesteric liquid crystals,POLARIZATION PROPERTIES,OPTICAL FEEDBACK,SHORT EXTERNAL-CAVITY,SURFACE-EMITTING LASERS,EDGE,SUBJECT},
  language     = {eng},
  location     = {San Francisco, CA, USA},
  pages        = {86390A:86390A-1--86390A:86390A-8},
  publisher    = {SPIE},
  title        = {VCSELs with nematic and cholesteric liquid crystal overlays},
  url          = {http://dx.doi.org/10.1117/12.2003937},
  volume       = {8639},
  year         = {2013},
}

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