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UV–Vis Spectrometers01:14

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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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Atomic Emission Spectroscopy: Instrumentation01:22

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Spectrophotometry: Introduction01:16

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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A Pearl Spectrometer.

Yunsang Kwak1, Sang Mok Park1, Zahyun Ku2

  • 1Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.

Nano Letters
|November 12, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel spectral information processing scheme using pearl-inspired light localization. This method enables efficient information recovery from incomplete measurements, overcoming limitations of traditional spectrometers.

Keywords:
Pearlscompressive samplingcomputational spectroscopylight localizationnacrespectral information recovery

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Signal Processing

Background:

  • Information recovery from incomplete measurements is crucial for classical and quantum signal processing.
  • Conventional methods using nanophotonics and light scattering face hardware limitations, requiring complex nanofabrication and bulky media.
  • Existing techniques for compressive sampling often rely on numerical processing.

Purpose of the Study:

  • To introduce a simple spectral information processing scheme using light transport through an Anderson-localized medium.
  • To leverage the properties of pearls (mother-of-pearl) for efficient spectral information extraction.
  • To develop a compact and thin form factor for spectral information processing.

Main Methods:

  • Utilizing light transport through an Anderson-localized medium as an entropy source for compressive sampling in the frequency domain.
  • Exploiting spatial and spectral intensity fluctuations from strong light localization in pearl-inspired nanostructures.
  • Employing a material-level hybridization of digital and physical properties for spectral processing.

Main Results:

  • Demonstrated a simple spectral information processing scheme.
  • Successfully extracted salient spectral information using pearl-inspired light localization.
  • Achieved spectral information processing with a compact and thin form factor.

Conclusions:

  • Pearl-inspired light localization in low-dimensional structures offers a novel approach to spectral information processing.
  • This method provides an alternative to conventional techniques by integrating digital and physical properties at the material level.
  • The developed scheme overcomes limitations associated with high-precision nanofabrications and bulky media.