Self-referenced measurements of the dielectric properties of metals using terahertz time-domain spectroscopy via the excitation of surface plasmon-polaritons

Chanana

et al. 2016

Advances in Physics: X

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Section: Plasmonic Measurements At Odds With Predictionssupporting

confidence: 51%

Section: Plasmonic Measurements At Odds With Predictionsmentioning

confidence: 80%

Section: Plasmonic Measurements At Odds With Predictionsmentioning

confidence: 96%

Section: Optical Constants Of Metalsmentioning

confidence: 99%

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

Chanana

et al. 2016

Advances in Physics: X

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“…The fact that the two spectra are nearly identical is consistent with the fact that high conductivities of conventional metals, including that of the Ag ink, in the THz regime corresponds to propagation lengths that are much larger than the spatial extent of the array. [ 21 ] There are several prominent resonances visible in the spectrum. As we have previously shown, it is the dips on the high frequency side of each resonance that are fi xed, for a given periodicity, and that correspond to the k-space representation of the geometry.…”

Section: Full Paper Full Paper Full Papermentioning

confidence: 99%

Terahertz Plasmonic Structures Based on Spatially Varying Conductivities

Advanced Optical Materials

Guruswamy

et al. 2014

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frequencies, the most common metals used for such structures are Au and Ag, since most other metals exhibit unacceptably high losses. As one moves to longer wavelengths, a broader range of materials has been shown to support relatively low loss propagation of surface plasmon-polaritons (SPPs), including not only all conventional metals [ 10 ] and superconductors, [ 11 ] but also more exotic metals such as doped semiconductors, [ 12,13 ] graphene, [ 7,8 ] conducting polymers [ 14 ] and liquid metals. [ 9 ] In the terahertz (THz) spectral range, for example, all conventional metals exhibit very large conductivities, corresponding to long propagation lengths, while many exotic metals exhibit lower conductivities, corresponding to higher propagation losses and therefore shorter propagation lengths.In an effort to expand the parameter space for the development of new and unique plasmonic device capabilities, it would be benefi cial to be able to pattern multiple plasmonic materials, with different conductivities, as an example, within a single two-dimensional (2D) structured fi lm. Such patterning would enable an additional level of control over the propagation properties of optical radiation. A variety of different deposition and patterning techniques exist to create the requisite pattern. Among these, the use of conventional microfabrication techniques involving vacuum deposition of the plasmonic material and a subsequent etching or lift-off step to create the fi nal device is the most common. Using this approach, creating a pattern with multiple materials is certainly possible using conventional microfabrication techniques, although each material would typically require the addition of multiple deposition and patterning steps. Thus, such an approach would usually be limited to the inclusion of only a few different materials or material variations. An alternate approach that is promising requires the use of an inkjet printer. Such printers have shown great success in printing antennas, [ 15 ] organic electronics, [ 16 ] thin fi lm transistors [ 17 ] and metamaterials. [ 18,19 ] This is often accomplished using sophisticated MEMS-based printers, which allow for the fabrication of high resolution patterns. However, such printers also typically allow for only one type of ink to be printed at a time.In this letter, we report the demonstration of THz plasmonic structures in which the conductivity of the metallic fi lm can be spatially varied widely using low cost, commercially available Terahertz plasmonic structures are demonstrated in which the conductivity of the metallic fi lm is varied spatially in order to further enhance the response. Using a commercially available inkjet printer, in which one cartridge is fi lled with conductive silver ink and a second cartridge is fi lled with resistive carbon ink, computer generated drawings of plasmonic structures are printed in which the individual printed dots can have differing amounts of the two inks, thereby creating a spatial variation in the conductivity. The silver ink...

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Bistable Physical Geometries for Terahertz Plasmonic Structures Using Shape Memory Alloys

Advanced Optical Materials

Zhang

et al. 2017

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