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IR Spectrometers01:25

IR Spectrometers

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...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...

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Related Experiment Video

Updated: May 13, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Birefringent reflectarray metasurface for beam engineering in infrared.

Mohsen Farmahini-Farahani1, Hossein Mosallaei

  • 1Department of Electrical and Computer Engineering, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA. farahani@ece.neu.edu

Optics Letters
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

This study demonstrates an infrared reflectarray metasurface that splits light into two polarized reflections. This engineered metasurface offers versatile applications in optical devices by manipulating light polarization.

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Last Updated: May 13, 2026

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Area of Science:

  • Optics and Photonics
  • Metamaterials Science

Background:

  • Metasurfaces offer precise control over light wavefronts.
  • Engineered birefringence is crucial for advanced optical components.

Purpose of the Study:

  • To demonstrate an infrared reflectarray metasurface with engineered birefringent behavior.
  • To achieve simultaneous manipulation of two orthogonal polarizations.

Main Methods:

  • Composed of rectangular metallic patch nanoantennas on a dielectric layer.
  • Nanoantennas are designed to locally control the phase of incoming light.
  • Tailoring reflection phase for desired wavefront transformation.

Main Results:

  • The reflectarray reradiates incident light into two orthogonal, linearly polarized reflections.
  • Simultaneous control over phase fronts for both polarizations is achieved.
  • Demonstrated engineered birefringent behavior in the metasurface.

Conclusions:

  • The proposed nanoantenna metasurface enables dual-polarization control.
  • Potential applications include birefringent modulators, waveplates, polarizers, and splitters.
  • Highlights the capability of metasurfaces for complex optical functionalities.