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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not...
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Open Resonator Electric Spaser.

Bobo Liu1, Weiren Zhu2, Sarath D Gunapala3

  • 1Advanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University , Clayton, Victoria 3800, Australia.

ACS Nano
|November 1, 2017
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate a novel electric spaser using an open resonator design. This breakthrough in nanoscale optics utilizes an all-carbon platform for potential integration into nanocircuits and photodynamic therapy.

Keywords:
Coulomb blockadecarbon nanotubegrapheneplasmonspaser

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Area of Science:

  • Optics and Photonics
  • Quantum Electrodynamics
  • Nanotechnology

Background:

  • The plasmonic laser (spaser) concept overcomes diffraction limits for nanoscale lasers.
  • Existing spaser designs rely on closed resonators, limiting miniaturization and integration.
  • Developing open-resonator spasers is crucial for advancing nanophotonics.

Purpose of the Study:

  • To theoretically demonstrate an electric spaser utilizing an open resonator.
  • To explore the feasibility of spaser designs with weak feedback in the quantum limit.
  • To propose an all-carbon platform for spaser fabrication.

Main Methods:

  • Cavity quantum electrodynamics analysis.
  • Theoretical modeling of carbon nanotube quantum dots as gain elements.
  • Simulation of graphene nanoribbons as open resonators.

Main Results:

  • Demonstrated the possibility of an electric spaser with an open resonator.
  • Observed Coulomb blockade in carbon nanotube quantum dots.
  • Characterized surface plasmon polariton field distribution with quantum electrodynamics features in graphene nanoribbons.

Conclusions:

  • An all-carbon platform enables the theoretical design of electric spasers with open resonators.
  • This work paves the way for integrating spasers into nanocircuits.
  • The findings support potential applications in photodynamic therapy.