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Related Concept Videos

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...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
IR Spectrum01:19

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0% (complete...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

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Published on: December 27, 2012

Infrared perfect absorber and its application as plasmonic sensor.

Na Liu1, Martin Mesch, Thomas Weiss

  • 14. Physikalisches Institut, Universitat Stuttgart, Stuttgart, Germany.

Nano Letters
|June 22, 2010
PubMed
Summary

Researchers developed a near-infrared perfect plasmonic absorber with 99% absorbance. This device enables robust refractive index sensing, maintaining performance in non-laboratory settings.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical Metamaterials

Background:

  • Localized surface plasmons (LSPs) are sensitive to changes in the surrounding refractive index, forming the basis of many optical sensors.
  • Conventional LSP sensors often suffer from performance degradation in non-ideal environments due to sensitivity to polarization and angle of incidence.
  • Perfect absorbers offer enhanced light-matter interaction, potentially improving sensor sensitivity and robustness.

Purpose of the Study:

  • To experimentally demonstrate a perfect plasmonic absorber operating at a wavelength of 1.6 micrometers.
  • To investigate the polarization-independent absorbance and angular performance of the fabricated perfect absorber.
  • To introduce and validate a novel sensing strategy utilizing the perfect absorber for refractive index sensing.

Main Methods:

  • Fabrication of a plasmonic nanostructure designed to exhibit near-perfect absorption at 1.6 micrometers.
  • Experimental characterization of the absorber's optical properties, including absorbance, polarization dependence, and angular response.
  • Integration of the perfect absorber into a sensing configuration for refractive index measurements.

Main Results:

  • Achieved a polarization-independent absorbance of 99% at normal incidence for the plasmonic absorber at 1.6 micrometers.
  • Demonstrated high absorbance (>99%) over a wide angular range of incidence (approximately +/-80 degrees).
  • Successfully utilized the perfect absorber as a plasmonic sensor, showing its capability for refractive index sensing.

Conclusions:

  • The developed perfect plasmonic absorber exhibits exceptional performance characteristics, including high absorbance and wide angular tolerance.
  • The proposed sensing strategy leverages the robust nature of the perfect absorber, offering a simple and reliable method for refractive index sensing.
  • This technology holds significant potential for practical sensing applications in diverse, non-laboratory environments.