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High-order exceptional points in optomechanics.

H Jing1, Ş K Özdemir2, H Lü3

  • 1Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, China. jinghui73@gmail.com.

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Summary
This summary is machine-generated.

We demonstrate enhanced mechanical cooling in coupled optical resonators by utilizing high-order exceptional points. This method facilitates low-power cooling of micromechanical devices near gain-loss balance.

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Area of Science:

  • Optics and Photonics
  • Quantum Mechanics
  • Mechanical Engineering

Background:

  • Coupled optical resonators with passive (lossy) and active (gain) components are crucial for advanced optical systems.
  • Mechanical cooling is essential for precise control and operation of micromechanical devices.
  • Exceptional points (EPs) in non-Hermitian systems offer unique properties but typically focus on the lowest order.

Purpose of the Study:

  • To investigate mechanical cooling in coupled active-passive optical resonators.
  • To explore the impact of a red-detuned driving laser on the system's supermode structure.
  • To demonstrate the enhancement of mechanical damping and stiffness using high-order exceptional points.

Main Methods:

  • Theoretical study of coupled optical resonators with gain and loss.
  • Analysis of the supermode structure under red-detuned laser driving.
  • Investigation of mechanical damping and spring stiffness near gain-loss balance.
  • Exploration of high-order exceptional points.

Main Results:

  • A red-detuned driving laser radically alters the supermode structure.
  • Genuine high-order exceptional points emerge in the coupled system.
  • Significant enhancement of mechanical damping and spring stiffness is observed.
  • Low-power mechanical cooling is achieved near the gain-loss balance point.

Conclusions:

  • High-order exceptional points in coupled active-passive optical resonators enable efficient mechanical cooling.
  • This work extends the application of exceptional points beyond the lowest order for steering micromechanical devices.
  • The findings open new avenues for low-power control and manipulation of micro- and nanomechanical systems.