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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

Published on: August 30, 2012

Terahertz aqueous photonics.

Qi Jin¹, E Yiwen¹, Xi-Cheng Zhang²

¹The Institute of Optics, University of Rochester, Rochester, NY, 14627, USA.

Frontiers of Optoelectronics

|January 13, 2023

Summary

This summary is machine-generated.

Researchers demonstrate liquid water as a novel terahertz (THz) source, overcoming strong absorption. Laser-induced plasma in thin water films efficiently generates THz waves, with enhanced output using two-color laser excitation.

Keywords:

laser-induced plasma liquid water terahertz (THz) wave generation

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Area of Science:

Physics
Optics
Materials Science

Background:

Developing efficient terahertz (THz) sources is crucial for diverse applications.
Liquid water, due to strong THz absorption, has not been explored as a THz source.
Previous THz generation methods utilized solids, gases, and plasmas.

Purpose of the Study:

To demonstrate liquid water as a viable terahertz (THz) source.
To investigate THz wave generation mechanisms in liquid water under laser excitation.
To enhance THz output and control using different excitation schemes.

Main Methods:

Utilized a thin water film subjected to intense laser excitation.
Proposed a laser-induced plasma formation with a ponderomotive force-induced dipole model.
Employed one-color and two-color laser excitation schemes, including phase control.

Main Results:

Liquid water films generated higher THz electric fields than air under identical conditions.
Optimized THz generation using sub-picosecond laser pulses (200-800 fs) for water, unlike air.
Two-color excitation enhanced THz electric fields by an order of magnitude, enabling coherent control.
A water line configuration improved THz wave coupling and detection, minimizing total internal reflection.

Conclusions:

Liquid water is a demonstrated source for terahertz (THz) wave generation.
Laser-induced plasma in water offers a novel pathway for THz emission.
Advanced laser techniques, like two-color excitation, significantly boost THz output and controllability.