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Related Concept Videos

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 Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Parallel Resonance01:23

Parallel Resonance

The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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...

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Related Experiment Video

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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

Engineering resonances in infrared metamaterials.

Boubacar Kanté1, André de Lustrac, Jean-Michel Lourtioz

  • 1Institut d'Electronique Fondamentale, Univ. Paris-Sud, UMR 8622, CNRS, Orsay, France.

Optics Express
|June 12, 2008
PubMed
Summary

Altering split ring resonator geometry in metamaterials predictably tunes their infrared response. This research offers design insights for creating negative index materials on silicon substrates.

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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

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Area of Science:

  • Metamaterials science
  • Nanophotonics
  • Infrared spectroscopy

Background:

  • Metamaterials achieve negative refractive index through engineered resonances, enabling negative permittivity and permeability.
  • Split ring resonators (SRRs) are key components in metamaterial design for manipulating electromagnetic waves.

Purpose of the Study:

  • To experimentally and numerically analyze the infrared response of metamaterials with varying SRR geometries.
  • To investigate the impact of SRR geometric tuning on the spectral properties of metamaterials.
  • To explore coupling effects between SRRs and continuous nanowires.

Main Methods:

  • Fabrication of metamaterials comprising continuous nanowires and SRRs on low-doped silicon.
  • Experimental measurement of infrared response (20-200 THz) for varying SRR geometries and field polarizations.
  • Numerical simulations to validate experimental findings and analyze coupling effects.

Main Results:

  • Geometric transformation of SRRs predictably shifts the metamaterial's frequency response.
  • Tuning SRRs towards cut wire structures leads to predictable spectral changes.
  • Coupling effects between SRRs and nanowires were analyzed for different spacings.

Conclusions:

  • SRR geometry is a critical factor in controlling metamaterial infrared response.
  • The study provides a predictable method for designing negative index metamaterials on silicon.
  • Understanding SRR-nanowire coupling is essential for optimizing metamaterial performance.