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Related Concept Videos

Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Terahertz superconducting plasmonic hole array.

Zhen Tian1, Ranjan Singh, Jiaguang Han

  • 1Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, China.

Optics Letters
|November 3, 2010
PubMed
Summary
This summary is machine-generated.

We developed a superconductor array with thermal control for tunable terahertz transmission using surface plasmon polaritons. This breakthrough enables advanced low-loss amplitude modulation and terahertz devices.

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Area of Science:

  • Condensed Matter Physics
  • Nanophotonics
  • Terahertz Science

Background:

  • Surface plasmon polaritons (SPPs) are electromagnetic waves propagating at the interface of a conductor and a dielectric.
  • Controlling SPP excitation and propagation is crucial for developing advanced optical devices.
  • Superconductors offer unique electromagnetic properties that can be exploited for plasmonic applications.

Purpose of the Study:

  • To demonstrate active thermal control over resonant transmission in a superconductor array of subwavelength holes.
  • To investigate the excitation and transition of surface plasmon polariton modes in a superconducting plasmonic crystal.
  • To explore potential applications of this tunable superconducting plasmonic system in terahertz devices.

Main Methods:

  • Fabrication of a subwavelength hole array on a high-temperature yttrium barium copper oxide superconductor using lithography.
  • Characterization of the fabricated array using terahertz time-domain spectroscopy.
  • Application of active thermal control to modulate the resonant transmission properties.

Main Results:

  • Observation of thermally controlled resonant transmission through the superconductor array.
  • Demonstration of a clear transition from virtual to real excitation of surface plasmon modes.
  • Confirmation of the tunable nature of the superconducting plasmonic crystal.

Conclusions:

  • The developed superconductor array offers active thermal control over SPP-induced resonant transmission.
  • This technology enables the design of low-loss, large dynamic-range amplitude modulators.
  • Potential applications include novel surface-plasmon-based terahertz devices with enhanced performance.