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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Terahertz reflectarray as a polarizing beam splitter.

Tiaoming Niu, Withawat Withayachumnankul, Aditi Upadhyay

|July 1, 2014

Summary

This summary is machine-generated.

This study presents a terahertz reflectarray capable of polarization-dependent beam splitting. The device efficiently separates two polarization components of terahertz waves for advanced imaging and communication applications.

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Area of Science:

Electromagnetics
Optics
Terahertz Technology

Background:

Reflectarrays are advanced optical components used for beam manipulation.
Polarization-dependent devices are crucial for advanced sensing and communication systems.
Terahertz (THz) frequencies offer unique properties for imaging and spectroscopy.

Purpose of the Study:

To design and experimentally demonstrate a reflectarray for polarization-dependent beam splitting at 1 THz.
To achieve efficient separation of orthogonal polarization components of THz waves.
To validate the design through simulations and experimental measurements.

Main Methods:

Designed a reflectarray using interlaced triangular lattices of orthogonal strip dipoles.
Engineered localized phase shifts by varying dipole dimensions.
Simulated field distributions and fabricated a prototype for experimental verification.

Main Results:

The reflectarray successfully separated two polarization components towards ±30°.
Achieved high polarization purity with cross-polarization levels below -27 dB.
Experimental measurements validated the simulated performance.

Conclusions:

The designed terahertz reflectarray functions as an efficient polarizing beam splitter.
This technology can be applied to polarization-sensitive THz imaging.
Potential applications include emerging THz communication systems.