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IR Absorption Frequency: Hybridization

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...

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Updated: Aug 23, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Published on: December 27, 2012

Dynamically electrical/thermal-tunable perfect absorber for a high-performance terahertz modulation.

Dongwen Zeng, Shu Zong, Guiqiang Liu

|October 27, 2022

Summary

This summary is machine-generated.

We developed a tunable terahertz absorber using graphene and vanadium dioxide (VO2) resonators. This device offers dynamic control over wideband absorption, enabling applications in advanced THz technologies.

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Area of Science:

Physics
Materials Science
Electrical Engineering

Background:

Terahertz (THz) wave applications require efficient absorption mechanisms.
Existing THz absorbers often lack dynamic tunability and wideband operation.
Hybrid structures offer potential for novel electromagnetic responses.

Purpose of the Study:

To design and demonstrate a high-performance, dynamically tunable perfect absorber for terahertz waves.
To investigate the manipulation of resonant properties for wideband and dual-band absorption.
To explore multifunctional applications of the proposed absorber platform.

Main Methods:

Utilizing a hybrid structure of graphene and vanadium dioxide (VO2) resonators.
Employing electrical and thermal tuning of VO2 conductivity and graphene Fermi level.
Applying impedance matching theory to analyze wideband absorption.
Analyzing chiral characteristics for circular dichroic response.

Main Results:

Achieved a wide-frequency terahertz perfect absorber operating from 1.594 THz to 3.272 THz.
Demonstrated dynamic absorption control from 0% to 99.98% by adjusting VO2 conductivity.
Showcased the transition from wideband to dual-band absorption by tuning graphene's Fermi level.
Observed circular dichroic response in the helical structure under circularly polarized light excitation.

Conclusions:

The proposed hybrid graphene-VO2 absorber provides a versatile platform for manipulating terahertz waves.
Dynamic tunability and multifunctional capabilities are achieved through external stimuli.
This work paves the way for developing advanced terahertz devices such as switches, modulators, and imaging systems.