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Generating Electromagnetic Radiations

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...

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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 wavefronts measured using the Hartmann sensor principle.

M Cui¹, J N Hovenier, Y Ren

¹SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands. m.cui@tudelft.nl

|June 21, 2012

Summary

This summary is machine-generated.

We adapted the Hartmann wavefront sensor (HWS) for terahertz (THz) radiation, enabling wavefront characterization. This new THz HWS uses a hole array and pyro-electric detector to accurately measure THz wavefronts.

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Area of Science:

Physics
Optics
Electromagnetism

Background:

Wavefront characterization is crucial for understanding and manipulating electromagnetic radiation.
Traditional wavefront sensing methods are often limited in their applicability to specific frequency ranges, such as terahertz (THz) radiation.

Purpose of the Study:

To demonstrate the feasibility of applying the Hartmann wavefront sensor (HWS) principle for characterizing terahertz (THz) electromagnetic radiation.
To develop and validate a novel THz Hartmann wavefront sensor system.

Main Methods:

Utilized a far-infrared gas laser operating at 2.5 THz to generate THz radiation with controlled wavefronts.
Employed a metallic plate with an array of holes to create intensity spots from the incident THz beam.
Used a two-dimensional scanable pyro-electric detector to measure the positions of spot centroids and compared them to reference positions for wavefront reconstruction.

Main Results:

Successfully adapted the Hartmann wavefront sensor principle for THz electromagnetic radiation.
The developed THz Hartmann wavefront sensor accurately measured wavefronts generated by a 2.5 THz laser.
Reconstructed wavefronts showed good agreement with theoretical model expectations.

Conclusions:

The Hartmann wavefront sensor principle is a viable method for characterizing terahertz wavefronts.
This work establishes a new tool for THz metrology and optical system characterization in the terahertz domain.