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IR Spectrometers01:25

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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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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.
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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.
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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.
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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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.
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Spectrally Tunable Ultrafast Long Wave Infrared Detection at Room Temperature.

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This study introduces an efficient room-temperature graphene detector for longwave infrared (LWIR) light. It offers high performance and tunable spectral detection, overcoming limitations of current uncooled LWIR technologies.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Room-temperature longwave infrared (LWIR) detectors are desirable for cost and operational advantages over cooled systems.
  • Current uncooled LWIR detectors, like microbolometers, suffer from low sensitivity, slow response, and limited spectral tunability.

Purpose of the Study:

  • To develop an efficient, room-temperature LWIR detector using graphene.
  • To enhance detector performance, including sensitivity and response time.
  • To achieve dynamic spectral tunability in the LWIR band.

Main Methods:

  • Utilizing patterned graphene with Dirac plasmons coupled to an optical cavity to enhance light absorption.
  • Employing the Seebeck effect for photovoltage conversion in an asymmetric carrier generation environment.
  • Implementing electrostatic gating for dynamic spectral tuning within the 8-12 μm LWIR range.

Main Results:

  • Demonstrated a graphene-based LWIR detector with high detectivity and fast response time.
  • Achieved enhanced light absorption through plasmonic effects and optical cavities.
  • Successfully demonstrated dynamic spectral tunability via electrostatic gating.

Conclusions:

  • The proposed graphene-based platform offers a promising new generation of uncooled LWIR photodetectors.
  • This technology enables high-performance, spectrally tunable LWIR detection at room temperature.
  • Potential applications span molecular sensing, medical diagnostics, military, security, and space exploration.