Optical Properties of Solids over a Wide Frequency Range

Dresselhaus, M. S.; Dresselhaus, G.; Cronin, Stephen B.; Filho, A. G. Souza

doi:10.1007/978-3-662-55922-2_19

Cited by 31 publications

(49 citation statements)

References 2 publications

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“…On the other hand, experimental estimation of dielectric constant from the optical dielectric function on imaginary part ( ε 2 ) is easily achieved using refractive index and extinction coefficient in the calculation as shown in the following relationship [ 78 , 281 , 282 , 283 , 284 , 285 , 286 ]:

where K and n are the extinction coefficient and refractive index, respectively. Previously, it has been proved that there are interband transitions from the appearance of the new peaks in the optical dielectric loss ( ɛ i ) spectra [ 291 , 292 , 293 , 294 , 295 , 296 ]. Then, the band gap energy can be determined from the intersection of the optical dielectric loss linear part with the axis of the photon energy in the spectra.…”

Section: Optical Parametersmentioning

confidence: 99%

“…Herein, it is of great importance that electron excitation from the valence band to the empty conduction band resulting from photon absorption is called interband transition. The mechanism involves absorption of photons, creating excited states and leaving holes behind is explained on the basis of quantum mechanical perspective [ 296 ]. It is also stated from quantum mechanics (microscopic) that a strong relationship between the electronic states and the optical loss parameter exists depending on whether they are filled and unfilled in solids.…”

Section: Optical Parametersmentioning

confidence: 99%

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A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

et al. 2020

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Polymer electrolytes and composites have prevailed in the high performance and mobile marketplace during recent years. Polymer-based solid electrolytes possess the benefits of low flammability, excellent flexibility, good thermal stability, as well as higher safety. Several researchers have paid attention to the optical properties of polymer electrolytes and their composites. In the present review paper, first, the characteristics, fundamentals, advantages and principles of various types of polymer electrolytes were discussed. Afterward, the characteristics and performance of various polymer hosts on the basis of specific essential and newly published works were described. New developments in various approaches to investigate the optical properties of polymer electrolytes were emphasized. The last part of the review devoted to the optical band gap study using two methods: Tauc’s model and optical dielectric loss parameter. Based on recently published literature sufficient quantum mechanical backgrounds were provided to support the applicability of the optical dielectric loss parameter for the band gap study. In this review paper, it was demonstrated that both Tauc’s model and optical dielectric loss should be studied to specify the type of electron transition and estimate the optical band gap accurately. Other parameters such as absorption coefficient, refractive index and optical dielectric constant were also explored.

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Section: Optical Parametersmentioning

confidence: 99%

Section: Optical Parametersmentioning

confidence: 99%

A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

et al. 2020

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“…But decreases with temperatures in electron trap region. The Auger excess electrons lifetimes is constant over the whole regions and increases for room temperature to 600 K then decreases above [8]. The Auger excess electrons lifetimes shows similar distribution to the radiative hole lifetime varies entire the whole regions.…”

Section: The Temperature Dependence Of Radiative and Auger Lifetimesmentioning

confidence: 64%

“…The localized centers hence act as acceptor levels. Therefore, the region is in C ED state and we can call this region acceptor region [8].…”

Section: 1the Temperature Dependence Of Trapping Effectsmentioning

confidence: 99%

The Study of the effects of Free Carriers Trap on the Recombination Mechanism through the Localized States

Fole¹

2019

JNSR

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In this study, the effects of free carriers trap on the recombination mechanism through the localized states in gallium antimonide (GaSb) is investigated through the simulation of excess carrier traps corresponding to the nonradiative recombination mechanism. Fist, the trapping effects (the ratio of the concentration of trapped carriers to the corresponding concentration of free carriers) is described as a function localized state energy at room and different temperatures inside the sample. Then, the radiative, Auger and Shockley-Read-Hall recombination mechanisms are compute using the relations describing the lifetimes of the excess majority and minority carriers in the band gap of semiconductor(GaSb). Finally, the temperature dependence of the radiative, Auger and Shockley-Read-Hall excess carrier lifetimes in the localized regions are investigated by considering the variation of localized energy positions. Since trap is indirectly related to the temperature, the description of the trapping effect as functions of localized state energies is found to be the important. The analysis of the results also shows that, the under localized regions are divided in to five based on the interaction of localized state energy with the conduction band energy or the valance band energy and decreases with temperature. The trap in shallow levels (donor and acceptor regions) tends to zero and deep levels are dominated at high temperature. The Auger lifetime is dominated than the other (radiative and Shockley-Read-Hall) lifetimes for the sample semiconductor (GaSb). The temperature affects both majority and minority carriers trap and their lifetimes in the three recombination mechanisms as functions of the localized state energies and the Auger lifetime is dominated in the semiconductor gallium antimonide sample.

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“…The indium antimonide (InSb) is selected for the semiconductor material because it possesses a large electron density and narrow energy gap. The permittivity of InSb ( ε InSb ) is described by the Drude model [ 29 ]

where

and

are the vacuum permittivity and high-frequency permittivity, respectively, ω is the angular frequency, γ is the damping constant, e is the electron charge, m eff is the effective mass of a free carrier and N is the intrinsic carrier density, which can be written as [ 30 ]

where T and K B are the operating temperature and Boltzmann constant, respectively. In the following discussions, the parameters of the Drude model for InSb are set as

= 15.68, γ = 0.1p THz and m eff = 0.015 m e (where m e is the mass of electron).…”

Section: Basic Considerationsmentioning

confidence: 99%

Bragg-Mirror-Assisted High-Contrast Plasmonic Interferometers: Concept and Potential in Terahertz Sensing

Han

et al. 2020

Nanomaterials

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A Bragg-mirror-assisted terahertz (THz) high-contrast and broadband plasmonic interferometer is proposed and theoretically investigated for potential sensing applications. The central microslit couples the incident THz wave into unidirectional surface plasmon polaritons (SPPs) waves travelling to the bilateral Bragg gratings, where they are totally reflected over a wide wavelength range back towards the microslit. The properties of interference between the SPPs waves and transmitted THz wave are highly dependent on the surrounding material, offering a flexible approach for the realization of refractive index (RI) detection. The systematic study reveals that the proposed interferometric sensor possesses wavelength sensitivity as high as 167 μm RIU−1 (RIU: RI unit). More importantly, based on the intensity interrogation method, an ultrahigh Figure-of-Merit (FoM) of 18,750% RIU−1, surpassing that of previous plasmonic sensors, is obtained due to the high-contrast of interference pattern. The results also demonstrated that the proposed sensors are also quite robust against the oblique illumination. It is foreseen the proposed configuration may open up new horizons in developing THz plasmonic sensing platforms and next-generation integrated THz circuits.

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Optical Properties of Solids over a Wide Frequency Range

Cited by 31 publications

References 2 publications

A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

A Comprehensive Review on Optical Properties of Polymer Electrolytes and Composites

The Study of the effects of Free Carriers Trap on the Recombination Mechanism through the Localized States

Bragg-Mirror-Assisted High-Contrast Plasmonic Interferometers: Concept and Potential in Terahertz Sensing

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