Novel devices with photosensitive elements
Novel devices with photosensitive elements
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具有感光元件的新颖装置
DOI：
10.1117/12.2515807
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Gleeson H
中科院分区：
文献类型：
--
作者：
Gleeson H
具有光敏元件的液晶(LC)器件在创造独特的光致光学器件方面有着令人难以置信的前景。基于偶氮苯的材料在特定波长的光照射下会发生反式顺式异构化，这种材料的使用在LC研究中得到了牢固的确立。反式构象是拉长的棒状，类似于LC介元，而顺式构象更接近球形(弯曲)，破坏了LC顺序。当这些材料被掺杂到液晶材料中时，它们能够产生光致响应，因此它们在光开关光学和器件中的应用是不可否认的。在本研究中，利用光诱导有序修正而不是光诱导重定向来制造一种全光可切换激光保护装置。当用连续、低功率(0.5 mW)、激光威胁(λ=40 5 nm)照射偶氮掺杂的液晶体系时，触发了Transcis光致异构化过程。这导致了跨顺共形形状的变化，降低了LC有序性，并导致系统从LC向列相(在交叉偏振器之间传输)切换到各向同性液体相(在交叉偏振器之间遮挡/暗)。对偶氮掺杂液晶材料的光学性质进行了表征，并详细研究了偶氮掺杂浓度、系统温度和激光威胁强度对响应时间的影响。
Liquid Crystal (LC) devices with photosensitive elements have incredible scope for creating unique photo-induced optical devices. The use of azobenzene based materials, which undergo a trans-cis isomerisation when irradiated with light of a specific wavelength, is firmly established in LC research. The trans conformation is an elongated rod-like shape, similar to LC mesogens, whilst the cis conformation is closer to a spherical (bent) shape, disrupting to the LC order. When these materials are doped into LC materials they are able to produce light induced responses, and therefore their application to photo-switchable optics and devices is undeniable. In this research paper the light induced order modification, rather than light induced reorientation, is utilized to produce an all-optical switchable laser protection device. Upon irradiation of an azo-doped LC system with a continuous, low power (0.5 mW), laser threat (λ=405 nm) the transcis photoisomerisation process is triggered. This results in the trans-cis conformal shape change, lowering of the LC order, and causing the system to switch from the LC nematic phase (transmitting between crossed polarisers) to the isotropic liquid phase (blocking/dark between crossed polarisers). The optical properties of the azo-doped LC materials have been characterized and the response time dependence on azo-dopant concentration, system temperature, and laser threat intensity is thoroughly investigated.
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影响因子：
3.8
作者：
Ethan I. L. Jull;H. Gleeson
通讯作者：
Ethan I. L. Jull;H. Gleeson
含有向列偶氮苯掺杂剂的胆甾型液晶混合物中激光诱导的同心色域
影响因子：
2.2
作者：
S. Serak;E. O. Arikainen;H. Gleeson;V. Grozhik;J. Guillou;N. Usova
通讯作者：
N. Usova
使用液晶 Lyot 滤光片进行自动激光检测和滤光
影响因子：
2.7
作者：
S. Rees;J. Staromlynska
通讯作者：
J. Staromlynska
影响因子：
1.3
作者：
Schwarz, Bastian;Ritt, Gunnar;Eberle, Bernd
通讯作者：
Eberle, Bernd
军事职业中的激光眼损伤。
DOI：
--
发表时间：
2003
期刊：
Aviation, space, and environmental medicine
影响因子：
--
作者：
Harris,MarkD;Lincoln,AndrewE;Amoroso,PaulJ;Stuck,Bruce;Sliney,David
通讯作者：
Sliney,David