Characterization of Terahertz Emission from High Resistivity Fe-doped Bulk Ga0.69In0.31As Based Photoconducting Antennas

Sengupta, Suranjana

doi:10.1007/978-1-4419-8198-1

Cited by 4 publications

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“…These spectral bandwidths are comparable to the values measured for the InP PC THz emitters. The emitted THz electric field amplitude is estimated according to 44 …”

Section: Resultsmentioning

confidence: 99%

Photoconductive terahertz generation from textured semiconductor materials

Collier

Stirling

Hristovski

et al. 2016

Sci Rep

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Photoconductive (PC) terahertz (THz) emitters are often limited by ohmic loss and Joule heating—as these effects can lead to thermal runaway and premature device breakdown. To address this, the proposed work introduces PC THz emitters based on textured InP materials. The enhanced surface recombination and decreased charge-carrier lifetimes of the textured InP materials reduce residual photocurrents, following the picosecond THz waveform generation, and this diminishes Joule heating in the emitters. A non-textured InP material is used as a baseline for studies of fine- and coarse-textured InP materials. Ultrafast pump-probe and THz setups are used to measure the charge-carrier lifetimes and THz response/photocurrent consumption of the respective materials and emitters. It is found that similar temporal and spectral characteristics can be achieved with the THz emitters, but the level of photocurrent consumption (yielding Joule heating) is greatly reduced in the textured materials.

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“…These spectral bandwidths are comparable to the values measured for the InP PC THz emitters. The emitted THz electric field amplitude is estimated according to 44 …”

Section: Resultsmentioning

confidence: 99%

Photoconductive terahertz generation from textured semiconductor materials

Collier

Stirling

Hristovski

et al. 2016

Sci Rep

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“…The design in the normal bulk material and the microwave region shows intrinsic impedance losses 41 .Physics of bulk material depends on the carrier dynamics for example Fe doped in bulk GaInAs 42 .Carrier lifetime should be ultrashort in these materials for possible photoconductive switching. It is found that Fe doped GaInAs is highly resistive and has sub picoseconds carrier lifetime 42 . Permittivity and permeability can be controlled by static E and H field consecutively in Ferroelectric bulk material 43 .…”

Section: Comparison Of Modelling Graphene Antenna With Normal Bulk Materials Antennamentioning

confidence: 99%

THz Generation using Nonlinear Optics: Mathematical Analysis and Design of THz antennas

Khulbe¹,

Tripathy²,

Parthasarathy

2018

AEM

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In this paper, a mathematical model is designed for THz generation from a nonlinear random medium. Using nonlinear optics and Maxwell’s equations a set of nonlinear wave equations are derived to give scattered electromagnetic fields from an inhomogeneous medium. First, the analysis is done with second order nonlinearity. Its scattering parameters are calculated for THz radiation. Secondly, third order nonlinearity is described in terms of the coupling of Scalar and vector field components of nonlinear wave equations. The coupling of waves results in soliton generation. Multiple nonlinear interaction in the medium also gives wide bandwidth. Speed and high bandwidth is a demand of future networks. Hence a mathematical proof is implemented for THz antennas using SHG (Second harmonic generation) and THG (Third harmonic generation) materials. These antennas are designed and simulated using GaAs as a SHG material, and Graphene with SiO2 substrate as a THG material. GaAs is used as a substrate, which radiates at 524.8 GHz giving a high bandwidth of 25 GHz. Similarly, Graphene patch antenna with SiO2 substrate radiates in THz region at 3.5THz giving very high bandwidth of 2.5THz.

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“…THz pulses are also generated through optical rectification, a nonlinear optical process based on degenerate difference frequency mixing [30]. Both methods require an ultrafast (~100 fs) optical laser source to drive the processes.…”

Section: Generation and Detection Of Thz Pulsesmentioning

confidence: 99%

Terahertz spectroscopy of nitric oxide for emissions monitoring in bioenergy systems

Mohamed¹

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II tc aAtsb AThe aim of this thesis is to study pollutants that are emitted from combustion systems using Terahertz time domain spectroscopy (THz-TDS). In particular, this thesis will focus on Nitric Oxide (NO), which is present in flue gases and contributes to air pollution. It is also interesting from a Physics perspective because it contains an unpaired electron in the valence shell, which leads to a complicated energy level structure, and interesting Physics.In this thesis, we aim to answer the question: "what is the detection limit of NO, using THz-TDS, and is it suitable for industrial emissions monitoring?" It is therefore necessary to look at detection limits, which in turn requires conducting THz spectroscopy at different gas pressures.A gas-cell containing NO is used in a THz-TDS set-up, where the temporal and spectral response of a THz pulse propagating through a gas sample of NO molecules is probed. A theoretical model for the interaction between the THz radiation and NO is developed, taking into account the complicated molecular structure of NO. A direct comparison is then made between the experimental data and our theoretical model. The good agreement between theory and experiment allows us to project the limits of detection for NO sensing that is possible with commercially available THz systems today, and the potential for the technology to be used in harsh environments is discussed. III List of papers1-"Terahertz spectroscopy of wood and combustion gas," M. Reid, T. Inagaki, S.

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Characterization of Terahertz Emission from High Resistivity Fe-doped Bulk Ga0.69In0.31As Based Photoconducting Antennas

Cited by 4 publications

References 0 publications

Photoconductive terahertz generation from textured semiconductor materials

Photoconductive terahertz generation from textured semiconductor materials

THz Generation using Nonlinear Optics: Mathematical Analysis and Design of THz antennas

Terahertz spectroscopy of nitric oxide for emissions monitoring in bioenergy systems

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