کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1546975 | 997627 | 2010 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Self-assembled quantum dots in a liquid-crystal-tunable microdisk resonator
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
GaAs-based semiconductor microdisks with high quality whispering gallery modes (Q>4000) have been fabricated. A layer of self-organized InAs quantum dots (QDs) served as a light source to feed the optical modes at room temperature. In order to achieve frequency tuning of the optical modes, the microdisk devices have been immersed in 4-cyano-4â²-pentylbiphenyl (5CB), a liquid crystal (LC) with a nematic phase below the clearing temperature of TCâ34âC. We have studied the device performance in the temperature range of T=20-50âC, in order to investigate the influence of the nematic-isotropic phase transition on the optical modes. Moreover, we have applied an AC electric field to the device, which leads in the nematic phase to a reorientation of the anisotropic dielectric tensor of the liquid crystal. This electrical anisotropy can be used to achieve electrical tunability of the optical modes. Using the finite-difference time domain (FDTD) technique with an anisotropic material model, we are able to describe the influence of the liquid crystal qualitatively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 42, Issue 10, September 2010, Pages 2552-2555
Journal: Physica E: Low-dimensional Systems and Nanostructures - Volume 42, Issue 10, September 2010, Pages 2552-2555
نویسندگان
Karoline A. Piegdon, Matthias Offer, Axel Lorke, Martin Urbanski, Andreas Hoischen, Heinz-S. Kitzerow, Stefan Declair, Jens Förstner, Torsten Meier, Dirk Reuter, Andreas D. Wieck, Cedrik Meier,