We demonstrate a superconductor array of subwavelength holes with active thermal control over the resonant transmission induced by surface plasmon polaritons. The array was lithographically fabricated on a high-temperature yttrium barium copper oxide superconductor and characterized by terahertz time-domain spectroscopy. We observe a clear transition from a virtual excitation of the surface plasmon mode to a real surface plasmon mode. The highly controllable superconducting plasmonic crystals may find promising applications in the design of low-loss, large- dynamic-range amplitude modulation and surface-plasmon-based terahertz devices.
© 2010 Optical Society of America
Optics at Surfaces
Original Manuscript: July 30, 2010
Manuscript Accepted: September 10, 2010
Published: October 21, 2010
Zhen Tian, Ranjan Singh, Jiaguang Han, Jianqiang Gu, Qirong Xing, Judy Wu, and Weili Zhang, "Terahertz superconducting plasmonic hole array," Opt. Lett. 35, 3586-3588 (2010)