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Nonlinear optical processes in liqui...

Zhao, Shuo.

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Nonlinear optical processes in liquid crystals and applications in optical switching.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nonlinear optical processes in liquid crystals and applications in optical switching./
作者:	Zhao, Shuo.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
面頁冊數:	138 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-07(E), Section: B.
Contained By:	Dissertation Abstracts International77-07B(E).
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10026165
ISBN:	9781339522494

Nonlinear optical processes in liquid crystals and applications in optical switching.
Zhao, Shuo.

Nonlinear optical processes in liquid crystals and applications in optical switching. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 138 p.

Source: Dissertation Abstracts International, Volume: 77-07(E), Section: B.

Thesis (Ph.D.)--The Pennsylvania State University, 2015.

This dissertation research completes the exploration and development of the theoretical framework for collective liquid crystalline optical nonlinearities capable of response speeds in the microseconds---nanoseconds scale, which is more than 1000 times faster than the conventional liquid crystal (LC) response speed. Also explored in this dissertation are utilizations of these new discoveries to achieve all-optical switching.

ISBN: 9781339522494Subjects--Topical Terms:

649834
Electrical engineering.

Nonlinear optical processes in liquid crystals and applications in optical switching.
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245 1 0 $a Nonlinear optical processes in liquid crystals and applications in optical switching.
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300 $a 138 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-07(E), Section: B.
500 $a Adviser: Iam Choon Khoo.
502 $a Thesis (Ph.D.)--The Pennsylvania State University, 2015.
520 $a This dissertation research completes the exploration and development of the theoretical framework for collective liquid crystalline optical nonlinearities capable of response speeds in the microseconds---nanoseconds scale, which is more than 1000 times faster than the conventional liquid crystal (LC) response speed. Also explored in this dissertation are utilizations of these new discoveries to achieve all-optical switching.
520 $a This work demonstrates all-optical switching using nonlinear orientational and thermal effects, respectively, in pure and dye-doped twisted nematic liquid crystal (TNLC) cells set between crossed polarizers. In the former case, the flow of liquid crystal molecules is generated by Maxwell stress and thereby exerts a torque on the liquid crystal. The resulting reorientation changes the effective birefringence of the liquid crystal, affecting the overall transmission. In dye-doped twisted nematics, the absorption of dye enhances laser heating in the liquid crystal, which leads to reduction of the order parameter and the corresponding macroscopic birefringence, finally making the transmission drop to zero. Following the sequences of these processes, detailed modeling for collective responses of liquid crystal and the time evolution of transmissions under short laser pulses are presented.
520 $a Besides theoretical description and modeling, we demonstrate the nonlinear optical switching experimentally. The switching threshold and time are consistent with the simulation results. While dye-doped liquid crystals have a low threshold for nonlinear switching, pure twisted nematics possess high transparency in the entire visible and nearinfrared spectrum. These findings are believed to advance the current arsenal of highperformance materials for integration/use in advanced optical systems designed for sensor protection; laser hardening; and other beam/image switching, sensing, and processing operations.
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