Infrared and terahertz signal detection in a quantum Dot nanostructure

Asadpour, Seyyed Hossein; Golsanamlou, Zahra; Soleimani, H. Rahimpour

doi:10.1016/j.physe.2013.05.022

Cited by 51 publications

(16 citation statements)

References 21 publications

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“…[23] has been considered for studying the dynamical properties of refractive index and optical transient processes. The quantum dot dimension information for calculating the wave functions and eigenenergies are listed in Table I which results from Ref.…”

Section: Model and Equationsmentioning

confidence: 99%

“…The quantum dot dimension information for calculating the wave functions and eigenenergies are listed in Table I which results from Ref. [23]. It is emphasized that these properties result from solving the Schrödinger-Poisson equations selfconsistently for carrier in InGaN/GaN quantum dot's conduction band.…”

Section: Model and Equationsmentioning

confidence: 99%

“…Experimental observations of interference between three-photon and one-photon excitations, and phase control of light attenuation in a four-level atomic system have been reported [14]. Similar phenomena based on the quantum interference and coherence in semiconductor quantum wells (SQWs) and quantum dots (QDs) have also been extensively studied in recent years [15][16][17][18][19][20][21][22][23]. The theory of quantum coherence phenomena in SQDs was introduced by Chow et al on the basis of earlier studies [24][25][26].…”

Section: Introductionmentioning

confidence: 97%

“…Based our recent work [23], we propose a four-level InGaN/GaN quantum dot nanostructure model by solving the Schrödinger and Poisson equations self-consistently.…”

Section: Introductionmentioning

confidence: 99%

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Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure

et al. 2017

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In this paper, we investigated the transient electron population and the transient behaviour of the dispersion, absorption and refractive property of weak probe light in a four-level InGaN/GaN quantum dot nanostructure. In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, the Schrödinger and Poisson equations is solved selfconsistently for carriers (here electron) in quantum dot. Our findings show that the properties of transient processes can be dramatically affected by parameters such as intensity, detuning and relative phase of applied fields. Our proposed scheme provides a realistic model for transient control of refraction index properties in a quantum dot nanostructure. These results may have potential applications in high speed optical switch for quantum information technologies.

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Section: Model and Equationsmentioning

confidence: 99%

Section: Model and Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

“…Based our recent work [23], we propose a four-level InGaN/GaN quantum dot nanostructure model by solving the Schrödinger and Poisson equations self-consistently.…”

Section: Introductionmentioning

confidence: 99%

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Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure

et al. 2017

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“…17,18 However, in recent times, the material need for producing and detecting terahertz are becoming abundant and consequently work on the that spectroscopy is also booming. For example, nanostructures 19,20 such as quantum dots and dendrimers 21,22 have been used for the generation and detection of terahertz radiation. These nanostructures are significantly smaller in size than conventional sources of terahertz radiation and thus make terahertz devices compact and relatively low cost.…”

Section: Introductionmentioning

confidence: 99%

Terahertz spectroscopic studies of quantum dots–conjugated gold nanoparticles

Uddin¹,

Ghann²

2018

MSEIJ

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Composite structures of metal nanoparticles and semiconductor nanomaterials present unique properties that have made them candidates for various applications. The properties of these hybrid structures to a large extent depend on the design and specific material used in to produce them. Here, we present work on the synthesis and characterization of CdSeS/ZnS quantum-dot-gold nanoparticles hybrids (denoted as QD-GNP) and studies on their interaction with terahertz radiation. The prepared QD-GNPs were characterized using UV-vis spectroscopy (UV-vis), Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM), Fluorescence Spectrometry, and Photoluminescence Lifetime measurement. The wavelength of maximum absorption of the gold nanoparticles was 519 nm while that of the quantum dot was 609 nm. The peak absorption band of the hybrid solution was around 519 nm. Transmission electron microscopy imaging revealed the surface morphological features of the quantum dot and gold nanoparticle. Strong photoluminescence quenching was observed upon the conjugation of the quantum dots with gold nanoparticles. The observed difference in the lifetime of free quantum dot and the hybrid QD-GNP was an indication of the bonding between the quantum dot and gold nanoparticles. A biexponential decay was observed with a lifetime of 3.57 ns for bare quantum dots and 1.05 ns for QD-GNP as for the faster component and the slower component 15.09 ns and 8.30 ns QD AND QD-GNP, respectively. Unique features were observed on the terahertz spectra of the composite structures in comparison with that of the either the QD or the GNP.

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Theoretical Study of Polarized Optical Bistability Due to Rydberg State in a Four-Level Atomic System under External Magnetic Field

Javanmard

2021

Int J Theor Phys

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Infrared and terahertz signal detection in a quantum Dot nanostructure

Cited by 51 publications

References 21 publications

Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure

Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure

Terahertz spectroscopic studies of quantum dots–conjugated gold nanoparticles

Theoretical Study of Polarized Optical Bistability Due to Rydberg State in a Four-Level Atomic System under External Magnetic Field

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