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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

813
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...
813
IR Absorption Frequency: Hybridization01:21

IR Absorption Frequency: Hybridization

645
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...
645
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

953
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
953

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Related Experiment Video

Updated: Jun 16, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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A Highly Sensitive Graphene-Based Terahertz Perfect Absorber Featuring Five Tunable Absorption Peaks.

Hongyu Ma1, Pengcheng Shi1, Zao Yi1,2

  • 1Joint Laboratory for Extreme Conditions Matter Properties, Key Laboratory of Manufacturing Process Testing Technology of Ministry of Education, State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China.

Materials (Basel, Switzerland)
|June 13, 2025
PubMed
Summary

We developed a tunable graphene absorber with five absorption peaks and high efficiency. This narrow-band perfect absorber demonstrates excellent sensitivity for potential applications in sensors and photoelectric devices.

Keywords:
THzgraphenehighly sensitivenarrow bandperfect absorber in multi-bandtunable absorber

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Area of Science:

  • Photonics and Plasmonics
  • Materials Science
  • Terahertz Technology

Background:

  • Graphene's unique properties make it a promising material for optical absorbers.
  • Developing tunable, multi-band absorbers with high sensitivity is crucial for advanced applications.
  • Existing absorbers often lack the desired combination of multiple absorption peaks and high sensitivity.

Purpose of the Study:

  • To design and demonstrate a novel narrow-band perfect graphene absorber.
  • To achieve excellent tunability across multiple frequency bands.
  • To investigate the absorber's potential for high-sensitivity sensing applications.

Main Methods:

  • Fabrication of a multi-layered structure with a square graphene ring and square cutout, a SiO2 dielectric layer, and a gold substrate.
  • Numerical simulations to analyze absorption spectra and identify resonance frequencies.
  • Parametric studies varying graphene properties (relaxation time, Fermi level) and refractive index to demonstrate tunability and calculate sensitivity.

Main Results:

  • Achieved five perfect absorption peaks at 6.08, 7.29, 9.35, 11.55, and 13.04 THz with efficiencies up to 99.99%.
  • Demonstrated excellent tunability by adjusting graphene's Fermi level and relaxation time.
  • Calculated a high sensitivity of 4508.75 GHz/RIU, outperforming previous research.

Conclusions:

  • The proposed graphene absorber offers superior performance with multiple absorption peaks and high efficiency.
  • The structure exhibits remarkable tunability, making it adaptable for various applications.
  • High sensitivity indicates significant potential for use in advanced sensors and photoelectric devices.