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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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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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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Topological-insulator-based terahertz modulator.

X B Wang1, L Cheng1, Y Wu2

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.

Scientific Reports
|October 19, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed an electronically-tunable terahertz modulator using a topological insulator. This device achieves ~62% modulation depth across a wide frequency range at room temperature, offering new possibilities for terahertz technology.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • Topological insulators are quantum materials with unique bulk and surface electronic properties.
  • Their narrow band gaps make them suitable for terahertz optoelectronics.
  • Existing terahertz modulators often lack tunability or operate efficiently only at specific frequencies.

Purpose of the Study:

  • To demonstrate an electronically-tunable terahertz intensity modulator.
  • To investigate the modulation performance of a specific topological insulator, Bi1.5Sb0.5Te1.8Se1.2.
  • To explore the potential of topological insulators in advanced terahertz applications.

Main Methods:

  • Fabrication of a terahertz intensity modulator using a Bi1.5Sb0.5Te1.8Se1.2 single crystal.
  • Experimental characterization of modulation depth and frequency response under varying bias currents and temperatures.
  • Analysis of the underlying physical mechanisms responsible for terahertz modulation.

Main Results:

  • Achieved a relative frequency-independent modulation depth of approximately 62% from 0.3 to 1.4 THz at room temperature.
  • Demonstrated enhanced modulation at low temperatures in the low current regime.
  • Identified thermally-activated carrier absorption in semiconducting bulk states as the primary mechanism for modulation.

Conclusions:

  • The study successfully demonstrates a novel, electronically-tunable terahertz intensity modulator based on a topological insulator.
  • The device exhibits significant modulation depth over a broad terahertz frequency range, highlighting its practical potential.
  • Topological insulators offer a promising platform for developing next-generation terahertz technologies.