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IR Spectrum01:19

IR Spectrum

1.9K
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%...
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Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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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.
Different compounds display unique properties due to their...
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IR Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

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When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with...
965
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

1.8K
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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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.4K
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...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

8.2K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
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Black phosphorus-based anisotropic absorption structure in the mid-infrared.

Tingting Liu, Xiaoyun Jiang, Chaobiao Zhou

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    Black phosphorus (BP), a 2D material, enables perfect light absorption in mid-infrared devices. Its unique anisotropic properties allow for highly polarization-selective and tunable optical functionalities.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Condensed Matter Physics

    Background:

    • Black phosphorus (BP) is an emerging two-dimensional (2D) material with unique optical properties.
    • BP shows promise for applications in optical and photonic devices.

    Purpose of the Study:

    • To propose and numerically demonstrate a simple structure for perfect light absorption in the mid-infrared using BP.
    • To investigate the polarization-dependent absorption characteristics and tunability of the proposed structure.

    Main Methods:

    • A structure with a monolayer BP sandwiched between low index contrast polymer and dielectric materials was numerically simulated.
    • The critical coupling of guided resonances was used to achieve perfect absorption.
    • The effects of electron doping, geometrical parameters, and incident angles on absorption were analyzed.

    Main Results:

    • The proposed structure achieved 99.9% absorption for TM polarization and 3.2% for TE polarization at the same mid-infrared wavelength, demonstrating critical coupling.
    • High polarization-dependent absorption was attributed to the in-plane anisotropy of BP.
    • Absorption characteristics were found to be flexibly tunable by adjusting electron doping, geometry, and incident angles.
    • Perfect absorption was also achieved with multilayer BP structures.

    Conclusions:

    • The developed BP-based structure offers high-efficiency, polarization-selective, and tunable light absorption in the mid-infrared.
    • The structure's advantages include remarkable anisotropy, flexible tunability, and ease of fabrication.
    • This work presents promising prospects for designing advanced optical devices like polarizers, modulators, and photodetectors.