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Inductance: Single-Phase And Three-Phase Line01:28

Inductance: Single-Phase And Three-Phase Line

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Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
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Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
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Related Experiment Video

Updated: Feb 12, 2026

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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Single-Nanoparticle Plasmon-Driven Phase Engineering of Two-Dimensional MoTe2.

Qingsong Tao1, Shuangyue Li1, Zijing Wu1

  • 1School of Physics and Optoelectronic Engineering, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China.

Nano Letters
|February 10, 2026
PubMed
Summary

We developed a plasmon-driven method using gold nanoparticles to control phase transitions in 2D materials like MoTe2. This enables all-optical nanoscale engineering for advanced sensing and nanophotonics applications.

Keywords:
Exciton ActivationLocalized Surface PlasmonMolybdenum DitelluridePhase TransitionTwo-Dimensional Materials

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • All-optical control of material phases at the nanoscale is crucial for reconfigurable nanophotonic and sensing platforms.
  • Few-layer transition metal dichalcogenides (TMDs) exhibit distinct properties based on their crystalline phase.

Purpose of the Study:

  • To present a plasmon-driven strategy for all-optical writing and reading of localized phase transitions in few-layer Molybdenum Ditelluride (MoTe2).
  • To demonstrate the use of individual gold nanoparticles (Au NPs) as dual-function nanoantennas for phase engineering and optical readout.
  • To explore the application of this phase transition control in nanoscale thermal sensing and reconfigurable heterostructures.

Main Methods:

  • Utilizing individual Au NPs as nanoantennas to concentrate laser excitation via localized surface plasmon resonances (LSPRs).
  • Driving the 2H→1T' phase transition in few-layer MoTe2 using hot carriers and local heating generated by plasmonic excitation.
  • Employing dark-field scattering spectroscopy for in situ optical readout of the phase transition, observing characteristic spectral shifts.
  • Confirming the 1T' phase formation using Raman spectroscopy.
  • Fabricating and characterizing vertical heterostructures (e.g., Au/MoTe2/MoS2) to study plasmon-induced band alignment reconfiguration.

Main Results:

  • Achieved a plasmon-driven 2H→1T' phase transition in few-layer MoTe2 with a threshold power reduced by nearly an order of magnitude.
  • Demonstrated in situ optical readout of the phase transition via characteristic redshift-then-blueshift behavior in dark-field scattering spectra.
  • Confirmed the temperature-dependent scattering response of the Au NP/1T'-MoTe2 system, enabling nanoscale optical thermal sensing.
  • Showcased reconfiguration of band alignment in an Au/MoTe2/MoS2 heterostructure, switching from a photoluminescence-quenched OFF state to a trion-dominated ON state via plasmon-induced phase conversion.

Conclusions:

  • Established a general route for all-optical, nanoscale phase engineering of 2D materials.
  • Highlighted the potential for active thermal and excitonic control in nanophotonic devices through controlled phase transitions.
  • Demonstrated the dual functionality of Au NPs as nanoantennas for both inducing and reading out nanoscale phase changes.