The dynamic process and microscopic mechanism of extraordinary terahertz transmission through perforated superconducting films
نویسندگان
چکیده
Superconductor is a compelling plasmonic medium at terahertz frequencies owing to its intrinsic low Ohmic loss and good tuning property. However, the microscopic physics of the interaction between terahertz wave and superconducting plasmonic structures is still unknown. In this paper, we conducted experiments of the enhanced terahertz transmission through a series of superconducting NbN subwavelength hole arrays, and employed microscopic hybrid wave model in theoretical analysis of the role of hybrid waves in the enhanced transmission. The theoretical calculation provided a good match of experimental data. In particular, we obtained the following results. When the width of the holes is far below wavelength, the enhanced transmission is mainly caused by localized resonance around individual holes. On the contrary, when the holes are large, hybrid waves scattered by the array of holes dominate the extraordinary transmission. The surface plasmon polaritions are proved to be launched on the surface of superconducting film and the excitation efficiency increases when the temperature approaches critical temperature and the working frequency goes near energy gap frequency. This work will enrich our knowledge on the microscopic physics of extraordinary optical transmission at terahertz frequencies and contribute to developing terahertz plasmonic devices.
منابع مشابه
Experimental Studies of Wave Transmission through Single Perforated Sheets and Upright Perforated Wave Filters
متن کامل
Kinetic inductance and penetration depth of thin superconducting films measured by THz-pulse spectroscopy.
We measure the transmission of THz pulses through thin films of YBa2Cu3O7−δ at temperatures between 10 K and 300 K. The pulses possess a usable bandwidth extending from ∼0.1 – 1.5 THz (3.3 cm – 50 cm). Below Tc we observe pulse reshaping caused by the kinetic inductance of the superconducting charge carriers. From transmission data, we extract values of the London penetration depth, as a functi...
متن کاملC-axis Josephson Plasma Resonance Observed in Tl2Ba2CaCu2O8 Superconducting Thin Films using Terahertz Time-Domain Spectroscopy
We have unambiguously observed the c-axis Josephson Plasma Resonance (JPR) in high-Tc cuprate Tl2Ba2CaCu2O8 superconducting thin films employing terahertz time-domain spectroscopy in transmission as a function of temperature in zero magnetic field. These are the first measurements of the JPR temperature dependence of a high-Tc material in transmission. With increasing temperature, the JPR shift...
متن کاملResonant terahertz transmission in subwavelength metallic hole arrays of sub-skin-depth thickness.
We study surface-plasmon-enhanced terahertz transmission through subwavelength metallic hole arrays of sub-skin-depth thickness. Dynamic evolution of surface-plasmon resonance in terms of array thickness is characterized by use of terahertz time-domain spectroscopy in the frequency range 0.1-4.5 THz. A critical thickness of lead array film is observed, above which surface-plasmon coupling of te...
متن کاملOptical conductivity of iron-based superconductors.
The new family of unconventional iron-based superconductors discovered in 2006 immediately relieved their copper-based high-temperature predecessors as the most actively studied superconducting compounds in the world. The experimental and theoretical effort made in order to unravel the mechanism of superconductivity in these materials has been overwhelming. Although our understanding of their m...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره 5 شماره
صفحات -
تاریخ انتشار 2015