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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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...
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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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Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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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

Self-protecting semiconductor optical limiters.

D J Hagan1, E W Van Stryland, M J Soileau

  • 1Center for Research in Electro-Optics and Lasers, University of Central Florida, Orlando, Florida 32816-0001, USA.

Optics Letters
|September 12, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a new optical limiter using zinc selenide (ZnSe) that protects sensitive materials from high-energy laser pulses. This passive device effectively limits optical power, safeguarding equipment from damage.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Semiconductor Physics

Background:

  • Optical power limiting is crucial for protecting sensitive equipment from high-intensity laser radiation.
  • Passive optical limiters offer a damage-free solution for laser safety applications.

Purpose of the Study:

  • To characterize passive picosecond optical-power-limiting devices in thick semiconductor samples.
  • To investigate the self-action mechanisms responsible for optical limiting in ZnSe.
  • To develop scaling relations for designing optimized optical limiter devices.

Main Methods:

  • Utilized tightly focused picosecond (30-psec) laser pulses at 532-nm wavelength.
  • Employed thick zinc selenide (ZnSe) semiconductor samples.
  • Analyzed nonlinear optical phenomena including two-photon absorption and free-carrier self-defocusing.

Main Results:

  • Observed effective optical power limiting in ZnSe due to internal self-action.
  • Identified two-photon absorption and free-carrier self-defocusing as key limiting mechanisms.
  • Established simple scaling relations linking limiting energy and dynamic range to geometry and sample dimensions.
  • Designed and demonstrated a monolithic optical limiter with a dynamic range exceeding 10^4.

Conclusions:

  • Passive optical power limiters in semiconductors can effectively protect bulk material from optical damage.
  • The developed scaling relations enable the design of optimized optical limiters with low limiting energy and high dynamic range.
  • The monolithic device demonstrates practical application for laser protection with high performance.