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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...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...

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Related Experiment Video

Updated: Jun 22, 2026

Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Published on: March 20, 2015

Surface-Enhanced Infrared Spectroscopy Using Resonant Nanoantennas.

Frank Neubrech1,2, Christian Huck2, Ksenia Weber1

  • 14th Physics Institute and Research Center SCoPE, University of Stuttgart , Pfaffenwaldring 57, Stuttgart 70569, Germany.

Chemical Reviews
|March 31, 2017
PubMed
Summary

Surface-enhanced infrared spectroscopy (SEIRA) using resonant metal nanoantennas dramatically boosts sensitivity for analyzing tiny samples. This technique leverages plasmonic fields to enhance infrared absorption, enabling highly sensitive molecular identification.

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Last Updated: Jun 22, 2026

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Advances in Nanoscale Infrared Spectroscopy to Explore Multiphase Polymeric Systems
06:54

Advances in Nanoscale Infrared Spectroscopy to Explore Multiphase Polymeric Systems

Published on: June 23, 2023

Area of Science:

  • Nanophotonics and Plasmonics
  • Spectroscopy
  • Chemical Sensing

Background:

  • Infrared spectroscopy offers label-free molecular identification but struggles with low sensitivity for minute sample amounts due to weak absorption.
  • Low infrared absorption cross-sections limit the application of traditional infrared spectroscopy in sensing and trace material analysis.

Purpose of the Study:

  • To introduce and review the principles and applications of surface-enhanced infrared spectroscopy (SEIRA) utilizing resonant metal nanoantennas.
  • To explain the physics behind resonant SEIRA, focusing on plasmon excitation and electromagnetic field enhancement.
  • To discuss strategies for maximizing SEIRA enhancement and explore its diverse applications.

Main Methods:

  • Utilizing resonant metal nanoantennas to generate localized, intense electromagnetic fields through plasmon excitation.
  • Investigating the resonant coupling between molecular vibrations and antenna plasmonic excitations.
  • Analyzing nanostructure geometries, arrangements, and materials to optimize SEIRA enhancement.

Main Results:

  • Demonstrated orders-of-magnitude enhancement in infrared absorption for molecules within the nanoantenna's electromagnetic field.
  • Established a clear understanding of the physics governing resonant SEIRA, including coupling mechanisms and field spatial extent.
  • Identified key design parameters for nanostructures that maximize the SEIRA signal.

Conclusions:

  • Resonant SEIRA overcomes the sensitivity limitations of traditional infrared spectroscopy for analyzing small sample volumes.
  • The technique enables highly sensitive molecular detection and characterization through plasmon-enhanced infrared absorption.
  • Resonant SEIRA shows broad applicability in areas like protein detection, dynamic process monitoring, and hyperspectral chemical imaging.