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Aperiodic nano-waveguides (nWVGs) offer superior heat conduction control compared to periodic structures. Maximum disorder in nWVGs leads to minimum thermal conductance, enabling better nanoscale thermal management.

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Area of Science:

  • Nanoscale science and engineering
  • Condensed matter physics
  • Materials science

Background:

  • Aperiodic nano-waveguides (nWVGs) and superlattices (SLs) are more efficient at limiting phonon transmission and heat conduction than periodic structures.
  • These structures can mitigate parasitic heat conduction, crucial for nanoscale heat management and energy conversion.

Purpose of the Study:

  • To investigate optimal aperiodicity in width-modulated nWVGs for maximum disorder.
  • To confirm the physics principle that maximum disorder minimizes thermal conductance in such systems.

Main Methods:

  • Development of a feasible optimization problem by reducing complexity.
  • Application of efficient Bayesian optimization techniques.
  • Quantification of disorder by the number of non-identical modulation units.

Main Results:

  • Optimal aperiodicity in width-modulated nWVGs was found to correspond to maximum disorder.
  • Results confirmed the physics rule that minimum thermal conductance is achieved with the most disordered arrays.
  • The degree of disorder was effectively quantified.

Conclusions:

  • Geometrical aperiodicity can be designed to control transmission properties in metamaterials.
  • This study provides a route for designing aperiodic structures for enhanced thermal management at the nanoscale.