Effect of Boundary Condition and Periodical Extension on Transmission Characteristics of Terahertz Filters with Periodical Hole Array Structure Fabricated on Aluminum Slab

Terahertz (THz) filters based on extraordinary optical transmission from periodical hole array structures fabricated on aluminum slab have been experimentally investigated by using THz time-domain spectroscopy. The incident THz pulses with frequency from 0.1 to 2.7 THz could be partly filtered, and the central peak was at ∼0.26. The high frequency signal could be observed to decrease, especially for the frequency above ∼1 THz. Moreover, the transmission peak from small-size sample with less hole arrays shifts to high frequency at ∼0.53 THz due to both the effects of boundary condition and insufficient periodical extension. Furthermore, finite element method with surface plasmon polariton theory is employed to analyze this extraordinary optical transmission and filter phenomena.

[1]  G. Kitaeva.  Terahertz generation by means of optical lasers , 2008 .

[2]  A. Rogalski.  Infrared detectors: status and trends , 2003 .

[3]  H. Raether.  Surface Plasmons on Smooth and Rough Surfaces and on Gratings , 1988 .

[4]  Yuri Svirko,et al.  Numerical phase correction method for terahertz time-domain reflection spectroscopy , 2004 .

[5]  J. Pendry,et al.  Mimicking Surface Plasmons with Structured Surfaces , 2004, Science.

[6]  S. Hunsche,et al.  Detectors and sources for ultrabroadband electro-optic sampling: Experiment and theory , 1999 .

[7]  H. Lezec,et al.  Effects of hole depth on enhanced light transmission through subwavelength hole arrays , 2002 .

[8]  J. P. Woerdman,et al.  Fano-type interpretation of red shifts and red tails in hole array transmission spectra , 2003, physics/0401054.

[9]  Makoto Kuwata-Gonokami,et al.  Power dissipation spectra and terahertz intervalley transfer gain in bulk GaAs under high electric fields , 2008 .

[10]  Xi-Cheng Zhang,et al.  Free-space electro-optics sampling of mid-infrared pulses , 1997 .

[11]  Guo Peng,et al.  Magnetically Tunable Terahertz Switch and Band-Pass Filter , 2008 .

[12]  Andrew J Gatesman,et al.  Wet-etch optimization of free-standing terahertz frequency-selective structures. , 2003, Optics letters.

[13]  Thomas W. Ebbesen,et al.  Crucial role of metal surface in enhanced transmission through subwavelength apertures , 2000 .

[14]  T. Ebbesen,et al.  Light in tiny holes , 2007, Nature.

[15]  Shi Wei,et al.  Terahertz Radiation from Large Aperture Bulk Semi-insulating GaAs Photoconductive Dipole Antenna , 2004 .

[16]  Time-Resolved Terahertz Spectroscopy with Free-Space Electro-Optic Sampling , 2004 .

[17]  Jagdeep Shah,et al.  Femtosecond Charge Transport in Polar Semiconductors , 1999 .

[18]  X. Zhang,et al.  7 terahertz broadband GaP electro-optic sensor , 1997 .

[19]  P. Planken,et al.  Measurement and calculation of the orientation dependence of terahertz pulse detection in ZnTe , 2001 .

[20]  W. Barnes,et al.  Surface plasmon subwavelength optics , 2003, Nature.

[21]  H. Lezec,et al.  Extraordinary optical transmission through sub-wavelength hole arrays , 1998, Nature.

[22]  J. Federici,et al.  THz imaging and sensing for security applications—explosives, weapons and drugs , 2005 .