Terahertz Response of ZnS/Ge and ZnO/Ge Nanostructured Composites

Sadeghi, Hossein; Zolanvar, A.; Ranjgar, A.; Norouzi, R.

doi:10.1007/s11468-013-9628-5

Cited by 9 publications

(5 citation statements)

References 22 publications

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“…Reports about composite films and their potential applications have attracted attentions in the past few years, such as tunable plasmonic metamaterials, nonlinear devices and mostly, modulated electrode component [ 25–31 ]. Those theoretical and experimental results focused on visible [ 28,29 ], deep infrared [ 30 ], and terahertz [ 31 ] ranges. Consequently, here we propose an ITO-based binary composite films, by simply comprising small amount of Ag and substantial ITO.…”

Section: Introductionmentioning

confidence: 99%

Tunable near-infrared epsilon-near-zero and plasmonic properties of Ag-ITO co-sputtered composite films

Chen

Wang

et al. 2018

Science and Technology of Advanced Materials

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Series of co-sputtered silver-indium tin oxide (Ag-ITO) films are systematically fabricated. By tuning the atomic ratio of silver, composite films are manifested to have different microstructures with limited silver amount (<3 at.%). Two stages for film morphology changing are proposed to describe different status and growth mechanisms. The introduction of silver improves the preferred orientations of In2O3 component significantly. Remarkably, dielectric permittivity of Ag-ITO films is highly adjustable, allowing the cross-over wavelengths λ c to be changed by more than 300 nm through rapid post-annealing, and thus resulting in tunable epsilon-near-zero and plasmonic properties in the near-infrared region. Lower imaginary permittivity compared with pure metal films, as well as larger tunability in λ c than pure ITO films suggest the potentiality of Ag-ITO films as substituted near-infrared plasmonic materials. Extended Maxwell-Garnett model is applied for effective medium approximation and the red-shifting of epsilon-near-zero region with the increase of silver content is well-fitted. Angle-variable prism coupling is carried out to reveal the surface plasmon polariton features of our films at optical communication wavelength. Broad dips in reflectance curves around 52–56° correspond to the SPP in Ag-ITO films.

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Section: Introductionmentioning

confidence: 99%

Tunable near-infrared epsilon-near-zero and plasmonic properties of Ag-ITO co-sputtered composite films

Chen

Wang

et al. 2018

Science and Technology of Advanced Materials

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“…In this paper, ZnS/Ag/ZnS sandwich structures were chosen as the transparent conductive system. ZnS, as an important semiconductor compound of the II-VI group was selected due to its high refractive index, wide band gap of 3.7 eV at room temperature and a relatively large exciton binding energy (approximately 40 meV) [6][7][8][9]. In the case of silver, the inter band transitions are in the UV range [10].…”

Section: Introductionmentioning

confidence: 99%

Optical properties of ZnS/Ag/ZnS transparent conductive sandwich structures investigated by spectroscopic ellipsometry

Zolanvari

Norouzi

Sadeghi

2015

J Mater Sci: Mater Electron

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Transparent and conductive ZnS (32 nm)/Ag (16 nm)/ZnS (32 nm) (ZAZ) sandwich structures are deposited on BK7 substrates by vacuum thermal evaporation. Transparent conductive films have unique characteristics such as low resistivity, high optical transmittance in the visible region and high absorption in the ultraviolet regions. The structure of the films is determined by in situ HT-XRD method. The optical properties of the films are ascertained by UV-VIS spectrophotometer. The refractive index n and the extinction coefficient k are extracted from the results of spectroscopic ellipsometry measurements by utilizing the Cauchy model, the refractive index and effective dielectric function are determined.

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“…For example, Sungjee Kim et al have synthesized both Type-I as well as Type-II quantum dot (QD) structures and observed good quantum yield enhancement in Type-I structures (20%), and shrinkage in Type-II structures (4%). 4 In this direction, a variety of heteronanostructures including InAs/InP, 5 InAs/CdSe, 6 CdSe/CdS, 7,8 CdSe/CdS/Zn 0.5 Cd 0.5 S/ZnS, 9 Si/ZnO, [10][11][12] Si/SiGe, 13,14 GaAs/ GaP, 15,16 TiO 2 /SnO 2 , 17,18 ZnO/Ge, [19][20][21] and CdSe/Si 22 structures have been synthesized by using multidisciplinary methods, and their interesting physical and chemical properties were explored. On the other hand, a few groups have also fabricated PV devices using various heteronanostructures and noticed considerable light conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

ZnO/ITO core/shell nanostructure electrodes for future prototype solar cell devices

Devika

Reddy

2015

RSC Adv.

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Terahertz Response of ZnS/Ge and ZnO/Ge Nanostructured Composites

Cited by 9 publications

References 22 publications

Tunable near-infrared epsilon-near-zero and plasmonic properties of Ag-ITO co-sputtered composite films

Tunable near-infrared epsilon-near-zero and plasmonic properties of Ag-ITO co-sputtered composite films

Optical properties of ZnS/Ag/ZnS transparent conductive sandwich structures investigated by spectroscopic ellipsometry

ZnO/ITO core/shell nanostructure electrodes for future prototype solar cell devices

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