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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...
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...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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,...

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Multispectral microbolometers for the midinfrared.

Thomas Maier1, Hubert Brueckl

  • 1AIT Austrian Institute of Technology, Nano Systems, 1220 Vienna, Austria. thomas.maier@ait.ac.at

Optics Letters
|November 18, 2010
PubMed
Summary
This summary is machine-generated.

Researchers investigated microbolometers with metamaterial absorbers, tuning sensitivity from 2.9 to 7.7 μm. Metallic shielding improved thermal response times for faster detector performance.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Microbolometers are crucial for infrared detection.
  • Metamaterials offer unique light-absorbing properties.
  • Controlling spectral responsivity and dynamic behavior is key for advanced applications.

Purpose of the Study:

  • To investigate the spectral responsivity of microbolometers integrated with absorbing metamaterials.
  • To analyze the dynamic behavior and thermal response of these devices.
  • To explore wavelength tuning capabilities through absorber element design.

Main Methods:

  • Fabrication of microbolometers with integrated absorbing metamaterial elements.
  • Characterization of spectral responsivity by varying lateral absorber dimensions.
  • Analysis of dynamic behavior, including thermal response times, with and without metallic shielding.

Main Results:

  • Achieved wavelength tuning of maximum sensitivity between 2.9 and 7.7 μm.
  • Observed peak optical absorptions up to 88% in the metamaterial absorbers.
  • Demonstrated that a continuous metallic shielding layer enhances thermal isolation, leading to faster response times.

Conclusions:

  • Integrated metamaterials provide effective wavelength tailoring for microbolometer spectral responsivity.
  • Metamaterial absorbers achieve high peak absorption across a tunable infrared spectrum.
  • Metallic shielding is a viable strategy to improve the dynamic performance of microbolometers.