Low-loss terahertz artificial dielectric birefringent quarter-wave plates

Saha, S.C., Ma, Y., Grant, J.P. , Khalid, A. and Cumming, D.R.S. (2010) Low-loss terahertz artificial dielectric birefringent quarter-wave plates. IEEE Photonics Technology Letters, 22(2), pp. 79-81. (doi: 10.1109/LPT.2009.2036242)

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We have developed anisotropically etched low-loss artificial dielectric birefringent quarter-wave plates (QWPs) for use at 1.5 and 2.8 THz. The grating period for both QWPs is 20 m. We etched 46- and 30-m-deep gratings to obtain a phase retardance between transverse-magnetic and transverse-electric polarization propagating through the QWPs at 1.5 and 2.8 THz, respectively. A SU8 antireflection coating is used to further improve the transmission coefficient by up to 21%. The measured results from Fourier transform infrared spectroscopy show a good agreement with designed specifications

Item Type:Articles
Keywords:Absorption, birefringence, devices, dielectric polarization, engineering, fabrication, gratings, physics, quantum cascade laser, spectroscopy, submillimeter wavelengths, submillimeter-wave devices, terahertz, THz, time-domain spectroscopy, transmission
Glasgow Author(s) Enlighten ID:Saha, Dr Shimul and Ma, Mr Yong and Cumming, Professor David and Khalid, Dr Ata-Ul-Habib and Grant, Dr James
Authors: Saha, S.C., Ma, Y., Grant, J.P., Khalid, A., and Cumming, D.R.S.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Photonics Technology Letters

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