Highly accurate optical material parameter determination with THz time-domain spectroscopy

Pupeza, Ioachim; Wilk, R.; Koch, Martin

doi:10.1364/oe.15.004335

Cited by 309 publications

(157 citation statements)

References 13 publications

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“…The complex transmission coefficient permitted us to calculate the frequency dependent dielectric function through inversion of the Fresnel equations. Etalons resulting from multiple reflections within the metamaterial were incorporated into the extraction algorithm 29,30 .…”

Section: Simulation and Experimentsmentioning

confidence: 99%

Single-layer terahertz metamaterials with bulk optical constants

et al. 2012

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We investigate the conditions under which single layer metamaterials may be described by bulk optical constants. Terahertz time domain spectroscopy is utilized to investigate two types of geometries, both with two different sizes of embedding dielectric -cubic and tetragonal unit cells. The tetragonal metamaterials are shown to yield layer dependent optical constants, whereas the cubic metamaterials yielded layer independent optical constants. We establish guidelines for when ǫ and µ can be used as material parameters for single layer metamaterials. Experimental results at terahertz frequencies are presented and supported by full wave three dimensional electromagnetic simulations.

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Section: Simulation and Experimentsmentioning

confidence: 99%

Single-layer terahertz metamaterials with bulk optical constants

et al. 2012

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“…The accuracy is also considerably restricted by the uncertainty in the actual value of the surface resistance of the conducting plates. Terahertz timedomain spectroscopy (THz TDS) [25,26] was also used for measuring the refractive index of materials from a few tens of GHz to several THz but is a complex and inconvenient method because two THz pulses need be propagated through a sample and because the isolation of the first pulse may not be possible in the cases of low refractive indexes and/or thin samples, and the accuracy of the method is restricted by the uncertainty of the measured signals.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement Method to Determine the Permittivity of Extra Thin Materials Using Resonant Metamaterials

Xu¹,

Yang²,

Huang³

et al. 2011

PIER

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Abstract-The permittivity of extra thin silk cloth is usually measured through some complex methods in the past. Here we propose a convenient and flexible method to measure the permittivity of extra thin silk cloth using resonant metamaterial structures. The metamaterial structures used here are symmetric split ring resonators (SRRs). The principle is that the resonant frequency of the SRRs is very sensitive to the permittivity of the surrounding medium. Therefore, the relative permittivity of an extra thin medium as silk cloth can be determined. Our experimental measurement shows that the relative permittivity of the silk cloth is 4.5. A piece of printing paper is also measured with a relative permeability of 1.4. The effectiveness of the method in determining the permittivity of a solid medium is very useful in future applications.

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“…(1) also defines the transmittance [39], where the periodicity of the FP effect is employed to achieve the effective optical thickness of the sample. The quasi-space is defined by the Fourier transform of an electro dynamical parameter y(ω n ) which could be the refractive index or the extinction coefficient.…”

Section: Thz Spectroscopymentioning

confidence: 99%

“…Several techniques [36][37][38][39][40] have been developed in order to extract ñ by computing the minimum difference between the moduli and the phases of H(ω) and T(ω):…”

mentioning

confidence: 99%

THz Measurement Systems

Angrisani¹,

Cavallo²,

Liccardo³

et al. 2016

New Trends and Developments in Metrology

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The terahertz (THz) frequency region is often defined as the last unexplored area of the electromagnetic spectrum. Over the past few years, the full access has been the objective of intense research efforts. Progress in this area has played an important role in opening up the possibility of using THz electromagnetic radiation (T-waves) in science and in realworld applications. T-waves are not perceptible by the human eye, are not ionizing, and have the ability to cross many non-conducting materials such as paper, fabrics, wood, plastic, and organic tissues. Moreover, the use of THz radiation allows non-destructive analysis of the materials under investigation both by study of their "fingerprint" via spectroscopic measurements and by high-resolution spatial imaging operations, exploiting the see-through capability of T-waves. Such technology can be applied in diverse areas, spanning from biology to chemical, pharmaceutical, environmental sciences, etc. In this chapter, we will present the typical architecture of measurement systems based on the THz technology, detailing what are the parameters that define their performance, the measurement methods, and the related errors and uncertainty, and focusing at the end on the use of time-domain spectroscopy for the evaluation of different material properties in this specific frequency region.

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Highly accurate optical material parameter determination with THz time-domain spectroscopy

Cited by 309 publications

References 13 publications

Single-layer terahertz metamaterials with bulk optical constants

Single-layer terahertz metamaterials with bulk optical constants

Experimental Measurement Method to Determine the Permittivity of Extra Thin Materials Using Resonant Metamaterials

THz Measurement Systems

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