Vertical-Cavity Surface-Emitting Laser With Cholesteric Liquid Crystal Overlay

被引：7
|
作者：
Panajotov, Krassimir [1 ,2 ]
Dems, Maciej [3 ]
Belmonte, Carlos [1 ]
Thienpont, Hugo [1 ]
Xie, Yi [4 ]
Beeckman, Jeroen [4 ]
Neyts, Kristiaan [4 ]
机构：
[1] Vrije Univ Brussel, Dept Appl Phys & Photon B PHOT TONA, Brussels Photon Team, B-1050 Brussels, Belgium
[2] Inst Solid State Phys, BU-1784 Sofia, Bulgaria
[3] Lodz Univ Technol, Inst Phys, PL-90924 Lodz, Poland
[4] Univ Ghent, Dept Elect & Informat Syst, B-9000 Ghent, Belgium
来源：
JOURNAL OF LIGHTWAVE TECHNOLOGY | 2014年 / 32卷 / 01期
关键词：
Cholesteric liquid crystals (CLCs); light polarization; liquid crystals (LCs); vertical-cavity surface-emitting lasers (VCSELs); POLARIZATION PROPERTIES; STOP BAND; MODULATION; MODES; VCSEL;
D O I：
10.1109/JLT.2013.2288996
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We study theoretically the spectral and polarization threshold characteristics of vertical-cavity surface-emitting lasers with an overlay of cholesteric liquid crystal (CLC-VCSELs). Due to the existence of CLC band gap for circularly polarized (CP) light the polarization state of the resonant modes in the compound system evolves from linear (LP) inside the VCSEL to elliptical and circular (CP) inside the CLC. As a result, the output mirror reflectivity is increased and CLC-VCSEL threshold gain is decreased. We elucidate the transition from LP to CP state of the generated light by studying the role of the CLC thickness and the top distributed Bragg reflector reflectivity. This transition takes place for 5-6 mu m thick CLC and is not gradual but happens in an oscillatory fashion. When the CLC thickness is fixed and the VCSEL top mirror reflectivity is decreased a profound gradual red shift of the resonant mode wavelength and increase of threshold gain are observed.
引用
收藏
页码：20 / 26
页数：7
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