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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 Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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 C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
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...
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and refractory oxide ion...
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in the 3500–3100 cm−1 range. Even though both O−H and N−H bonds vibrate at a similar...

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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

Published on: December 18, 2015

Far infrared interference filters.

S P Varma, K D Möller

    Applied Optics
    |January 15, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Copper capacitive meshes were fabricated on plastic film for far-infrared low-pass filters. Their spectral properties were analyzed, demonstrating effective application in grating spectrometers for filtering specific far-infrared wavelengths.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Spectroscopy

    Background:

    • Far-infrared (FIR) spectroscopy requires precise filtering to isolate specific spectral regions.
    • Capacitive meshes offer a tunable method for creating optical filters.
    • Previous research has explored mesh filters, but optimization for FIR applications is ongoing.

    Purpose of the Study:

    • To fabricate and characterize capacitive copper meshes for use as low-pass filters in the far-infrared spectral region.
    • To investigate the influence of mesh constants and filter configurations (two, four, and eight meshes) on filter performance.
    • To evaluate the applicability of these mesh filters within a grating spectrometer setup.

    Main Methods:

    • Fabrication of capacitive meshes using copper layers deposited on 2.5-micrometer plastic film.
    • Characterization of mesh properties with varying mesh constants (g).
    • Performance evaluation of two, four, and eight-mesh filter combinations using a grating spectrometer in the 160 cm⁻¹ to 10 cm⁻¹ spectral range.

    Main Results:

    • Successfully prepared capacitive meshes with controllable properties.
    • Demonstrated the low-pass filtering behavior of the meshes in the far-infrared spectrum.
    • Showcased the effectiveness of multi-mesh configurations (two, four, eight) in refining filter characteristics.

    Conclusions:

    • Copper capacitive meshes on plastic film are effective components for far-infrared low-pass filters.
    • The performance of these filters can be tuned by adjusting mesh constants and the number of meshes.
    • These filters are suitable for integration into grating spectrometers for advanced far-infrared analysis.