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Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
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Nonlinear response from optical bound states in the continuum.

Evgeny N Bulgakov1,2, Dmitrii N Maksimov3,4,5

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Area of Science:

  • Nonlinear optics
  • Condensed matter physics
  • Electromagnetism

Background:

  • Optical bound states in the continuum (BICs) offer unique light-matter interaction possibilities.
  • Nonlinear effects are crucial for advanced optical devices but complex to model.
  • Periodic structures provide a versatile platform for controlling light propagation.

Purpose of the Study:

  • To investigate nonlinear effects in light scattering by periodic structures with BICs.
  • To understand the mechanism of optical bistability arising from resonant BIC enhancement.
  • To develop a simplified analytical model for nonlinear phenomena in such systems.

Main Methods:

  • Coupled mode theory to model the resonant mode associated with BICs.
  • Derivation of a nonlinear equation for the resonant mode amplitude.
  • Comparison of analytical solutions with full-wave solutions of Maxwell's equations.
  • Analysis of bistability onset by treating the system as a driven nonlinear oscillator.

Main Results:

  • Resonant enhancement of the scattered field near BICs triggers optical bistability.
  • The derived nonlinear equation accurately predicts bistable solutions, matching full-wave simulations.
  • The coupled mode approach simplifies the analysis of nonlinear Maxwell's equations.
  • Bistability can be controlled by varying incident wave parameters.

Conclusions:

  • Nonlinear effects in BICs provide a pathway to optical bistability.
  • The coupled mode approach offers a powerful and simplified tool for analyzing nonlinear optical phenomena.
  • This work facilitates the engineering of optical responses using BICs for novel device applications.