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Related Concept Videos

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...
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...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
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...

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

Published on: July 8, 2013

Mid-infrared designer metals.

S Law1, D C Adams, A M Taylor

  • 1Department of Electrical and Computer Engineering, University of Illinois Urbana Champaign, Urbana, Illinois 61801, USA. slaw2@illinois.edu

Optics Express
|June 21, 2012
PubMed
Summary
This summary is machine-generated.

Highly-doped semiconductor epilayers show promise for mid-infrared plasmonic devices. Researchers fabricated and tested subwavelength disks, observing localized plasmonic resonances tunable across the mid-infrared spectrum.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Semiconductor epilayers are crucial for advanced optical applications.
  • Mid-infrared (MIR) plasmonics offers unique opportunities for sensing and spectroscopy.
  • Controlling material properties is key to designing effective plasmonic devices.

Purpose of the Study:

  • To investigate highly-doped indium arsenide (InAs) epilayers as building blocks for MIR plasmonic structures.
  • To demonstrate the tunability of plasma frequency in InAs epilayers for MIR applications.
  • To fabricate and characterize subwavelength InAs disks for localized plasmonic resonances.

Main Methods:

  • Growth of highly-doped InAs epilayers using molecular beam epitaxy (MBE).
  • Characterization via Hall measurements and various optical techniques.
  • Fabrication of subwavelength disks and comparison of experimental results with numerical simulations and a quasistatic dipole model.

Main Results:

  • Demonstrated controlled plasma frequency across a broad range of MIR frequencies in InAs epilayers.
  • Successfully fabricated subwavelength InAs disks exhibiting localized plasmonic resonances.
  • Achieved good agreement between experimental observations, numerical simulations, and theoretical models.

Conclusions:

  • Highly-doped InAs epilayers are viable building blocks for MIR plasmonic devices.
  • The plasma frequency of these epilayers can be precisely tuned for MIR applications.
  • Fabricated InAs disks show promise for creating tunable MIR plasmonic structures.