This work is supported by National Natural Science Foundation of China (NSFC) (Project Nos. The refractive index and absorption coefficient of blue phase liquid crystals are investigated by terahertz time-domain spectroscopy system. When light passes through a medium, some part of it will always be attenuated. Four phases, including isotropic phase, BPII, BPI, and cholesteric phase are investigated. IP address: 43.229.77.178, on 25 Nov 2020 at 10:09:58, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. 3099067 It is known as damping constant, attenuation index, extinction coefficient, or (rather misleading) absorption constant. KQTD2015071710313656]. The refractive index (n) and extinction coefficient (k) are related to the interaction between a material and incident light, and are associated with refraction and absorption (respectively). To learn about our use of cookies and how you can manage your cookie settings, please see our Cookie Policy. For BPII and BPI, the measured absorption coefficients increase with the increase of frequency, with absorption peak appearing at 1.11 and 1.05 THz, respectively. 5 Howick Place | London | SW1P 1WG. Refractive Index and Absorption Coefficient, Sign in with your institutional credentials, Journal of Astronomical Telescopes, Instruments, and Systems, Journal of Micro/Nanolithography, MEMS, and MOEMS, Journal of Micro-Nanolithography, MEMS, and MOEMS. The influence of alloy broadening on the absorption edge was investigated by using a series of AlGaN alloy samples with a range of Al compositions. The velocity of propagation of a electromagnetic wave through a solid is given by the frequency-dependent complex refractive index N = n - ik where the real part, n is related to the velocity, and k, the extinction coefficient is related to the decay, or damping of the oscillation amplitude of the incident electric field. You have requested a machine translation of selected content from our databases. Add to cart, Registered in England & Wales No. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website. JCYJ20150601155130435], Shenzhen Overseas High-Level Talent Peacock Team [Project No. The refractive index and absorption coefficient of blue phase liquid crystals are investigated by terahertz time-domain spectroscopy system. The refractive index below the band gap was determined for the same series of samples. +1 888 902 0894(United States)+1 360 685 5580(International). Home > eBooks > Field Guide to Polarization > Refractive Index and Absorption Coefficient Translator Disclaimer You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. No potential conflict of interest was reported by the authors. These properties of BPLC provide useful information for BPLC-based terahertz components such as phase shifter, wave-plates and so on. Thin film material coatings on various substrates provide important functionalities for the microfabrication industry, and the n, k, as well as the thickness, t, of these thin film constituents must be measured and controlled to allow for repeatable manufacturing. In our experiment, in the frequency range of 0.2–1.2 THz, the refractive index of BPII and BPI is about 1.620 and 1.625, respectively. 61405088], Basic Research of Shenzhen Science and Technology Innovation Council [Project No. The refractive index has been measured by an ellipsometer at 546 nm, and the absorption coefficient has been determined from transmittance measured by a … 48 hours to view or download: Ãb¤R6+òÄ)àjŒ'N�`ñØ. The imaginary part k of the complex index of refraction thus describes rather directly the attenuation of electromagnetic waves in the material considered. The refractive index of liquid crystal sample is dependent on the temperature, which is related to the different phases. Four phases, including isotropic phase, BPII, BPI, and cholesteric phase are investigated. 30 days to view or download: KQTD2015071710313656). Register to receive personalised research and resources by email, Refractive index and absorption coefficient of blue phase liquid crystal in terahertz band, Department of Electrical & Electronic Engineering, Southern University of Science and Technology, Shenzhen, Guangdong, China, Center for Terahertz Waves, College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Nankai, Tianjin, China, /doi/full/10.1080/02678292.2016.1203461?needAccess=true. USD 51.00 61405088), Basic Research of Shenzhen Science and Technology Innovation Council (Project No. Create a new folder below. Downloaded from https://www.cambridge.org/core. The refractive index and absorption coefficient of amorphous Fe2O3-SiO2-CaO-Al2O3 slags have been determined at room temperature as functions of the basicity of [mass pct CaO]/[mass pct SiO2] and the Fe2O3 concentration. By closing this message, you are consenting to our use of cookies. They can be considered as the “fingerprint of the material". Abstract: A theoretical study has been carried out to evaluate key parameters of In x Ga 1-x As material at energies below the direct band edge. Add to cart, Issue Purchase Article Purchase You currently do not have any folders to save your paper to! Restore content access for purchases made as guest. This can be conveniently taken into account by defining a complex refractive index, We use cookies to improve your website experience. These JCYJ20150601155130435), Shenzhen Overseas High-Level Talent Peacock Team (Project No. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations. This work is supported by National Natural Science Foundation of China (NSFC) [Project Nos. Not for further distribution unless allowed by the License or with the express written permission of Cambridge University Press. Absorption and extinction coefficient theory. The optical absorption coefficient above the band gap was obtained for AlGaN having up to 38% Al composition. In general the refractive index is a complex variable, with the real part representing refraction (i.e. The spectral dependence of refractive index, absorption coefficient, and photoelastic constants are evaluated for the whole composition range in In x Ga 1-x As material on the basis of simplified models of the interband transitions. USD 794.00 Translations are not retained in our system.
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