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Related Concept Videos

Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that stretch at a...
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...
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR spectroscopy,...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Interferometric tunability of absorption.

Vittorio Giovannetti, Seth Lloyd, Lorenzo Maccone

    Optics Express
    |June 17, 2009
    PubMed
    Summary
    This summary is machine-generated.

    We developed an interferometric method to control light absorption in objects. This technique allows for targeted irradiation or precise measurement of material transmissivity using a consistent light source.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Controlling light-matter interactions is crucial in various scientific fields.
    • Accurate measurement of material properties like transmissivity is often challenging.

    Purpose of the Study:

    • To introduce a novel interferometric setup for tunable radiation absorption.
    • To enable selective irradiation of object portions based on transmissivity.
    • To facilitate accurate transmissivity estimation from absorption data.

    Main Methods:

    • Utilizing an interferometric configuration with a fixed light source.
    • Modulating the optical path difference to control energy absorption.
    • Correlating absorption levels with material transmissivity.

    Main Results:

    • Demonstrated tunability of absorbed radiation by an object.
    • Showcased the ability to selectively irradiate specific object regions.
    • Validated the accurate estimation of transmissivities from absorption measurements.

    Conclusions:

    • The proposed interferometric setup offers precise control over light absorption.
    • This method provides a versatile tool for both selective irradiation and accurate material characterization.