Design of achromatic terahertz quarter wave plate by simulated annealing algorithm
Design of achromatic terahertz quarter wave plate by simulated annealing algorithm
- Author(s): Guobin Ren and Pengcheng Zhang
- DOI: 10.1049/cp.2011.1077
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- Author(s): Guobin Ren and Pengcheng Zhang Source: International Conference on Advanced Infocomm Technology 2011 (ICAIT 2011), 2011 page ()
- Conference: International Conference on Advanced Infocomm Technology 2011 (ICAIT 2011)
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- DOI: 10.1049/cp.2011.1077
- ISBN: 978-1-84919-473-0
- Location: Wuhan, China
- Conference date: 11-14 July 2011
- Format: PDF
Achromatic THz wave plates are a prerequisite for THz polarization operation, especially in THz time domain spectroscopy techniques. We demonstrated in this paper the design of quartz achromatic THz quarter wave plate by simulated annealing algorithm. The phase retardation, retardation detuning, thickness and absorption loss for a quartz quarter wave plate that are combined by up to 8 quartz plates are discussed. It is shown that as the number of the combined quartz plates increasing, a remarkable retardation stability over an ultrabroadband frequency range (0.2-3 THz) could be achieved. It is found that there should be a compromise between the retardation detuning and absorption loss of THz wave plate. For a practical THz achromatic quarter wave plate operated from 0.2 THz to 3 THz, the optimized quartz plate number is about five. (3 pages)
Inspec keywords: terahertz materials; optical retarders; simulated annealing; light absorption; quartz
Subjects: Optical materials; Optimisation techniques; Microwave materials and structures
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