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激光加热下石蜡复合斑点的增强热光开关特性

Enhanced Thermo-Optical Switching of Paraffin-Wax Composite Spots under Laser Heating.

作者信息

Said Asmaa, Salah Abeer, Fattah Gamal Abdel

机构信息

National Institute of Laser Enhanced Sciences, Cairo University, Cairo 12613, Egypt.

出版信息

Materials (Basel). 2017 May 12;10(5):525. doi: 10.3390/ma10050525.

DOI:10.3390/ma10050525
PMID:28772884
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5459078/
Abstract

Thermo-optical switches are of particular significance in communications networks where increasingly high switching speeds are required. Phase change materials (PCMs), in particular those based on paraffin wax, provide wealth of exciting applications with unusual thermally-induced switching properties, only limited by paraffin's rather low thermal conductivity. In this paper, the use of different carbon fillers as thermal conductivity enhancers for paraffin has been investigated, and a novel structure based on spot of paraffin wax as a thermo-optic switch is presented. Thermo-optical switching parameters are enhanced with the addition of graphite and graphene, due to the extreme thermal conductivity of the carbon fillers. Differential Scanning Calorimetry (DSC) and Scanning electron microscope (SEM) are performed on paraffin wax composites, and specific heat capacities are calculated based on DSC measurements. Thermo-optical switching based on transmission is measured as a function of the host concentration under conventional electric heating and laser heating of paraffin-carbon fillers composites. Further enhancements in thermo-optical switching parameters are studied under Nd:YAG laser heating. This novel structure can be used in future networks with huge bandwidth requirements and electric noise free remote aerial laser switching applications.

摘要

热光开关在对开关速度要求越来越高的通信网络中具有特别重要的意义。相变材料（PCM），尤其是基于石蜡的相变材料，具有丰富的令人兴奋的应用，其热诱导开关特性独特，只是受石蜡相当低的热导率限制。本文研究了使用不同的碳填料作为石蜡的热导率增强剂，并提出了一种基于石蜡点作为热光开关的新型结构。由于碳填料的极高热导率，添加石墨和石墨烯可提高热光开关参数。对石蜡复合材料进行了差示扫描量热法（DSC）和扫描电子显微镜（SEM）分析，并根据DSC测量结果计算了比热容。在石蜡 - 碳填料复合材料的传统电加热和激光加热下，测量基于透射的热光开关作为主体浓度的函数。研究了在Nd:YAG激光加热下热光开关参数的进一步增强。这种新型结构可用于未来对带宽要求极高且无电噪声的远程空中激光开关应用的网络中。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d386/5459078/ee20e619ee47/materials-10-00525-g012.jpg
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