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Published on: March 23, 2017
Resonant terahertz transmissions through metal hole array on silicon substrate
Xiao Xiao1, Wu Jinbo, Yuki Sasagawa
1Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Optics Express
|October 14, 2010
Summary
We observed resonant terahertz transmission peaks using a metal film with a periodic hole array and dielectric substrate. This interaction allows for tunable frequencies, potentially useful for terahertz (THz) bio-sensing applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Applied Physics
Background:
- Periodic structures in metal films can exhibit unique electromagnetic properties.
- Waveguide modes in dielectric materials can interact with surface plasmons or other resonant phenomena.
- Terahertz (THz) spectroscopy is a valuable tool for material characterization and sensing.
Purpose of the Study:
- To investigate resonant terahertz transmission peaks in a specific sample configuration.
- To elucidate the underlying physical mechanism responsible for the observed resonant transmissions.
- To explore the potential of this system for tunable terahertz applications, such as bio-sensing.
Main Methods:
- Fabrication of metal films with perforated periodic hole arrays.
- Coating these perforated films with high dielectric substrates.
- Experimental measurement of terahertz transmission spectra.
- Numerical simulations using the Finite Difference Time Domain (FDTD) method.
Main Results:
- Observation of distinct resonant terahertz transmission peaks.
- Experimental data showed good agreement with FDTD simulations.
- The resonant transmissions were attributed to the interplay between dielectric waveguide modes and the periodic hole array.
- Demonstrated the possibility of inducing additional resonant transmissions via guided modes.
Conclusions:
- The interplay between dielectric waveguide modes and periodic hole arrays is responsible for resonant terahertz transmission.
- The proposed mechanism provides a pathway for tuning transmission peak frequencies.
- This tunable terahertz transmission offers potential for advanced applications in bio-sensing.
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