Non-Drude like behaviour of metals in the terahertz spectral range

Pandey, Shashank; Gupta, Barun; Chanana, Ashish; Nahata, Ajay

doi:10.1080/23746149.2016.1165079

Cited by 30 publications

(32 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…plasmonic, electromagnetic wave propagation than what is the case under normal incidence transmission. Discrepancies with regard to constitutive parameters affecting normal incidence and longitudinal measurements have been previously reported in metals [55]. Furthermore, a broadening of the EOT peaks could also in part be contributing to a further experimental enhancement in Q-factor of adjacent resonant dips.…”

Section: (A) Captures the Effect Of Intra-band Transitions Excited Bymentioning

confidence: 84%

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd₃As₂

et al. 2019

Self Cite

View full text Add to dashboard Cite

Three-dimensional (3D) semimetals have been predicted and demonstrated to have a wide variety of interesting properties associated with its linear energy dispersion. In analogy to twodimensional (2D) Dirac semimetals, such as graphene, Cd3As2, a 3D semimetal, has shown ultrahigh mobility, large Fermi velocity, and has been hypothesized to support plasmons at terahertz frequencies. In this work, we demonstrate synthesis of high-quality large-area Cd3As2 thin-films through thermal evaporation as well as the experimental realization of plasmonic structures consisting of periodic arrays of Cd3As2 stripes. These arrays exhibit sharp resonances at terahertz frequencies with associated quality-factors (Q) as high as ~ 3.7. Such spectrally-narrow resonances can be understood on the basis of a large kinetic-inductance, resulting from a long momentum scattering time, which in our films can approach ~1 ps at room-temperature.Moreover, we demonstrate an ultrafast tunable response through excitation of photo-induced 2 carriers in optical pump / terahertz probe experiments. Our results evidence that the intrinsic 3D nature of Cd3As2 provides for a very robust platform for terahertz plasmonic applications. Overall, our observations pave a way for the development of myriad terahertz (opto) electronic devices based on Cd3As2 and other 3D Dirac semimetals, benefiting from strong coupling of terahertz radiation, ultrafast transient response, magneto-plasmon properties, etc. Moreover, the long momentum scattering time, thus large kinetic inductance in Cd3As2, also holds enormous potential for the re-design of passive elements such as inductors and hence can have a profound impact in the field of RF integrated circuits.

show abstract

Section: (A) Captures the Effect Of Intra-band Transitions Excited Bymentioning

confidence: 84%

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd₃As₂

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Therefore, it does not seem that the experimentally observed reduction of by 2-3 orders of magnitude as compared to the Drude theory can be caused by radiation losses of SW energy as suggested in Ref. [9,10]. Nevertheless, we note that the actual correlation function of a rough surface may significantly differ from the Gaussian one of Eq.…”

Section: Discussionmentioning

confidence: 49%

“…(62), is strongly affected by the surface roughness. On the contrary, experimental data [9,10] supports the conclusion that in the terahertz range of frequencies conforms the classical Drude theory which does not take into account the effect of surface roughness.…”

Section: Discussionmentioning

confidence: 70%

“…In our opinion, it is feasible that the above mentioned experimental results might be attributed to the effect of enhanced ohmic losses in thin metal films as it is also discussed in Ref. [9,10].…”

Section: Discussionmentioning

confidence: 76%

“…To compare our results with experimental data summarized in Refs. [9,10], one needs to compute vertical and horizontal scale-lengths of a surface wave.…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Dispersion relation of a surface wave at a rough metal-air interface

Kotelnikov¹,

Stupakov²

2016

Phys. Rev. A

View full text Add to dashboard Cite

We derived a dispersion relation of a surface wave at a rough metal-air interface. In contrast to previous publications, we assumed that an intrinsic surface impedance due to a finite electric conductivity of the metal can be of the same order as the roughness-induced impedance. We then applied our results to the analysis of a long-standing problem of the discrepancy between the experimental data on the propagation of surface waves in the terahertz range of frequencies and the classical Drude theory.

show abstract

Bistable Physical Geometries for Terahertz Plasmonic Structures Using Shape Memory Alloys

Gupta

Pandey

Zhang

et al. 2017

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

Shape memory alloy foils that are appropriately patterned are cycled between two different metal foil geometries resulting in two different terahertz (THz) plasmonic responses. This is accomplished by using patterned foils of a nickel-titanium alloy (Nitinol) that switches between the martensite phase below 31° C, yielding one physical geometry, and the austenite phase, when the foil is heated above 51° C, yielding a second physical geometry. In order to enable this reproducible switching, the sample is initially put through a two-way training procedure, through which the two different This article is protected by copyright. All rights reserved. 2 desired physical geometries are imprinted. Specifically, the metal foils are trained to switch between a sinusoidal corrugation, either one-dimensional (1D) or two-dimensional (2D), at close to room temperature and a flat metal sheet above the austenite phase transition temperature. The foils are found to switch reproducibly between geometries over at least 100 thermal cycles. Using THz timedomain spectroscopy, the transmission properties of the foils are measured as a function of incident polarization and foil geometry. The changes in spectrum are explained qualitatively and through numerical simulation.

show abstract

Non-Drude like behaviour of metals in the terahertz spectral range

Cited by 30 publications

References 65 publications

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd₃As₂

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd₃As₂

Dispersion relation of a surface wave at a rough metal-air interface

Bistable Physical Geometries for Terahertz Plasmonic Structures Using Shape Memory Alloys

Contact Info

Product

Resources

About

Non-Drude like behaviour of metals in the terahertz spectral range

Cited by 30 publications

References 65 publications

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd3As2

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd3As2

Dispersion relation of a surface wave at a rough metal-air interface

Bistable Physical Geometries for Terahertz Plasmonic Structures Using Shape Memory Alloys

Contact Info

Product

Resources

About

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd₃As₂

Manifestation of Kinetic Inductance in Terahertz Plasmon Resonances in Thin-Film Cd₃As₂