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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Photo-designed terahertz devices.

Takanori Okada¹, Koichiro Tanaka

¹Pioneering Research Unit for Next Generation, Kyoto University, Kyoto 615-8520, Japan. t.okada@kupru.iae.kyoto-u.ac.jp

Scientific Reports

|February 23, 2012

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Researchers developed photo-designed terahertz devices for real-time frequency modulation of electromagnetic waves. These devices utilize a laser-induced conductive structure on silicon, enabling tunable modulation without complex fabrication.

Area of Science:

Photonics and Materials Science
Optoelectronics and Wave Manipulation

Background:

Artificial materials like photonic crystals and metamaterials are key for manipulating electromagnetic waves.
Terahertz (THz) frequency devices are crucial for various applications, with artificial metallic periodic structures showing promise.

Purpose of the Study:

To demonstrate the fabrication of novel photo-designed terahertz devices.
To achieve real-time, wide-range frequency modulation of terahertz electromagnetic waves.

Main Methods:

Fabrication of devices using a photo-induced, planar periodic-conductive structure.
Irradiation of a silicon surface with a spatially modulated, femtosecond optical pulsed laser.
Tuning modulation frequency via structural periodicity and assessing excitation power effects.

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Main Results:

Successful fabrication of photo-designed terahertz devices capable of real-time frequency modulation.
Demonstrated tunability of modulation frequency by structural periodicity.
Confirmed minimal impact of optical pump pulse excitation power on modulation frequency.

Conclusions:

The developed photo-design approach offers a pathway to create all-optical compact operating devices.
These findings could lead to the development of optical integrated circuits without traditional materials fabrication.
The technology enables efficient manipulation of terahertz electromagnetic waves.