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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Nanowire heating by optical electromagnetic irradiation.

Paden B Roder1, Peter J Pauzauskie, E James Davis

  • 1Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 16, 2012
PubMed
Summary

Nanowire heating: Analytical models reveal morphology-dependent resonances significantly impact temperature rise in nanoscale structures. Silicon nanowires show uniform heating, unlike carbon, which exhibits higher, non-uniform temperatures.

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Area of Science:

  • Nanophotonics and Plasmonics
  • Heat Transfer in Nanomaterials
  • Optical Physics

Background:

  • Dissipative absorption of electromagnetic energy by 1D nanoscale structures is crucial for applications like photothermal theranostics, photovoltaics, and integrated photonics.
  • Understanding temperature distribution in these structures under optical frequencies is essential for device performance and efficiency.

Purpose of the Study:

  • To present closed-form analytical calculations for temperature rise in infinite circular cylinders (nanowires) under laser irradiation.
  • To compare analytical solutions with numerical simulations (FDTD) and Mie scattering theory.
  • To investigate the influence of material properties, porosity, and morphology-dependent resonances (MDRs) on temperature distribution.

Main Methods:

  • Developed closed-form analytical solutions for heat source calculations in nanowires.
  • Performed numerical finite-difference time domain (FDTD) simulations.
  • Compared analytical results with FDTD simulations and Mie scattering cross sections.
  • Analyzed the impact of material composition, porosity, and MDRs on temperature profiles.

Main Results:

  • Maximum temperature increase is influenced by composition, porosity, and MDRs, which cause significant local temperature spikes at specific diameters.
  • Silicon nanowires exhibit highly uniform internal temperatures (1 part in 10^6) during electromagnetic heating, even with fluctuating electric fields.
  • Highly absorbing materials like carbon show higher, non-uniform temperatures, and do not exhibit MDRs.

Conclusions:

  • MDRs play a critical role in the thermal response of nanowires, leading to localized heating effects.
  • Material properties and morphology significantly dictate the temperature distribution and uniformity in optically heated nanowires.
  • The findings are relevant for optimizing nanoscale devices in various optical applications.