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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements

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Frequency-agile THz-wave generation and detection system using nonlinear frequency conversion at room temperature.

Ruixiang Guo¹, Tomofumi Ikar'i, Jun Zhang

¹RIKEN Advanced Science Institute, 519-1399 Aramaki Aoba, Aoba-ku, Sendai 980-0845, Japan. rguo@i2r.a-star.edu.com

|August 20, 2010

Summary

A new system generates tunable terahertz (THz) waves for spectroscopy. This frequency-agile THz parametric oscillator and coherent detection system operates at room temperature and enables advanced THz spectral imaging.

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Area of Science:

Physics
Optics
Spectroscopy

Background:

Terahertz (THz) wave generation and detection are crucial for various scientific applications.
Developing compact, tunable, and room-temperature THz systems remains a significant challenge.

Purpose of the Study:

To establish a frequency-agile terahertz (THz) parametric oscillator and coherent detection system.
To demonstrate a room-temperature THz spectrometer with potential for real-time spectral imaging.

Main Methods:

Utilizing a surface-emitting THz parametric oscillator for narrow-linewidth, nanosecond pulsed THz radiation.
Employing frequency up-conversion in MgO:LiNbO(3) crystal for coherent THz detection.
Implementing a special optical design with a variable-angle mirror and 1:1 telescope for fast frequency tuning and achromatic detection.

Main Results:

Demonstration of a frequency-agile THz-wave parametric generation and coherent detection system.
Achieved fast frequency tuning and automatic achromatic THz-wave detection.
Established a room-temperature THz spectrometer.

Conclusions:

The developed system offers a versatile platform for THz spectroscopy.
The system's design facilitates potential development into a real-time two-dimensional THz spectral imaging system.
This advancement contributes to the field of THz technology for scientific research.