Finite-difference time-domain analysis of time-resolved terahertz spectroscopy experiments

Larsen, Casper; Cooke, David G.; Jepsen, Peter Uhd

doi:10.1364/josab.28.001308

Cited by 24 publications

(13 citation statements)

References 20 publications

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“…Analysis of ultrafast dynamics experiments with sub-picosecond resolution has been proposed within the frame of finite-difference time-domain calculations. [73,74] www.advopticalmat.de…”

Section: General Considerationsmentioning

confidence: 99%

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Kužel

Němec

2019

Advanced Optical Materials

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Transport of charges is a fundamental process in many high-tech applications including photovoltaic or optoelectronic devices, but also in more ordinary components such as unsophisticated wires and other circuitry. The development of nanotechnologies resulted in the fabrication of highly complex materials consisting of a large variety of nanosized elements, which inevitably involve a multitude of charge transport processes occurring on various time-and length-scales. Figure 1 summarizes the most common nanoelements with high application potential.For example, the electrodes employed in Grätzel solar cells [1] are composed of percolated networks of a huge number of metal oxide nanoparticles (top-left panel in Figure 1). Colloidal nanocrystals form the basis for thin film electronics and flexible electronic devices. [2] The synthetic approaches control their composition, size and electronic structure (energy levels, density of states within the bands and in the bandgap) and the charge-carrier transport. [2,3] Nanowires and nanotubes made of conventional semiconductors are quasi 1D systems combining Terahertz spectroscopy has been used for almost two decades for investigations of nanomaterials, including nanocrystals, nanoparticles, nanowires, nanotubes or 2D crystals. Its great importance stems from the fact that it is a noncontact method and, owing to its high frequency and broadband character, it is capable of characterizing charge transport properties within individual nano-objects but also among them. In addition, probing of photoinitiated ultrafast charge dynamics is possible thanks to the sub-picosecond time resolution. Despite this unprecedented potential, the interpretation of the measured terahertz conductivity spectra in many materials is still intensively debated. Herein is presented a review of the experiments performed on nanostructures of conventional semiconductors and on carbon nanomaterials (graphene and carbon nanotubes) during the past decade. The state of the art of the theoretical formalism is provided and discussed, including the intrinsic response, as well as the role of inherent heterogeneity and of the experimental conditions.

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“…Analysis of ultrafast dynamics experiments with sub-picosecond resolution has been proposed within the frame of finite-difference time-domain calculations. [73,74] www.advopticalmat.de…”

Section: General Considerationsmentioning

confidence: 99%

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Kužel

Němec

2019

Advanced Optical Materials

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“…E ref ðtÞ is the THz pulse at negative p . Scanning the THz pulse generation delay line with respect to a fixed pump and sampling beam, we project the THz waveforms such that each point of the measured waveform has experienced an identical p [20,25]. Figure 1(a) shows the Fourier amplitude spectrum of E ref ðtÞ shown in Fig.…”

mentioning

confidence: 99%

Direct Observation of Sub-100 fs Mobile Charge Generation in a Polymer-Fullerene Film

2012

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“…This limit corresponds to a delta-function A(t) ∼ δ(t − t p ) (type II pulse) or derivative of a delta-function A(t) ∼ δ (t−t p ) (type I pulse) of the vector potential. This limit is particularly interesting as from the delta-distribution A(t) pulse in principal the results for a general form of A(t) can be generated, and the variable time delay tricks 25,26,33 can in effect reveal the response associated with the very narrow pulse limit.…”

Section: A Short Probe-pulsesmentioning

confidence: 99%

Nonequilibrium optical conductivity: General theory and application to transient phases

et al. 2017

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A non-equilibrium theory of optical conductivity of dirty-limit superconductors and commensurate charge density wave is presented. We discuss the current response to different experimentally relevant light-field probe pulses and show that a single frequency definition of the optical conductivity σ(ω) ≡ j(ω)/E(ω) is difficult to interpret out of the adiabatic limit. We identify characteristic time domain signatures distinguishing between superconducting, normal metal and charge density wave states. We also suggest a route to directly address the instantaneous superfluid stiffness of a superconductor by shaping the probe light field.

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Finite-difference time-domain analysis of time-resolved terahertz spectroscopy experiments

Cited by 24 publications

References 20 publications

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Direct Observation of Sub-100 fs Mobile Charge Generation in a Polymer-Fullerene Film

Nonequilibrium optical conductivity: General theory and application to transient phases

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