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Related Concept Videos

Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Published on: January 7, 2019

Semiconductor-doped liquid-core optical fiber.

Ali Hreibi1, Frédéric Gérôme, Jean-Louis Auguste

  • 1XLIM-UMR 6172 Université de Limoges/CNRS, 123 avenue Albert Thomas, 87060 Limoges Cedex, France.

Optics Letters
|May 5, 2011
PubMed
Summary
This summary is machine-generated.

Researchers created a semiconductor liquid-core optical fiber using lead-selenium (PbSe) nanoparticles. This novel fiber enables visible-to-infrared light conversion and guided propagation, paving the way for new optical devices.

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Conventional optical fibers often rely on rare-earth ion doping for specific wavelength applications.
  • Developing new materials for optical fibers is crucial for expanding their functional capabilities.
  • Liquid-core optical fibers offer unique properties for light manipulation and integration of active components.

Purpose of the Study:

  • To demonstrate a novel semiconductor liquid-core optical fiber.
  • To achieve visible-to-infrared light conversion using nanoparticles within an optical fiber.
  • To investigate the guided propagation and spectral properties of such a device.

Main Methods:

  • Fabrication of a liquid-core optical fiber by filling a capillary waveguide with lead-selenium (PbSe) nanoparticles suspended in toluene.
  • Excitation of the nanoparticles using continuous optical power at 532 nm.
  • Observation and analysis of infrared emission guided by the fiber core via total internal reflection.

Main Results:

  • Successful demonstration of infrared emission from PbSe nanoparticles within the optical fiber.
  • Observation of guided propagation of the emitted infrared light through the fiber core.
  • A linear redshift of the emission peak (~0.32 nm/cm) was measured due to guided propagation and absorption effects.

Conclusions:

  • A functional semiconductor liquid-core optical fiber capable of visible-to-infrared conversion has been developed.
  • The guided propagation enhances light-matter interactions, leading to spectral shifts.
  • This technology offers a pathway for creating active fiber devices operating at wavelengths beyond conventional rare-earth doping limitations.