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Negative cavity photon spectral function in an optomechanical system with two parametrically-driven mechanical modes.
Optics Express
|November 29, 2023
Summary
Researchers demonstrate a novel optomechanical system achieving negative cavity photon spectral function (CPSF), equivalent to negative absorption. This breakthrough enables tunable optomechanical filters and optical transistors with enhanced control.
Area of Science:
- Quantum Optics
- Optomechanics
- Condensed Matter Physics
Background:
- Cavity photon spectral function (CPSF) typically describes absorption.
- Standard optomechanical systems do not exhibit negative CPSF.
- Negative CPSF is equivalent to negative absorption or optical gain.
Purpose of the Study:
- To propose an experimentally feasible optomechanical scheme for realizing negative CPSF.
- To investigate the conditions and controllability of negative CPSF.
- To explore potential applications in modified optomechanically induced transparency and tunable filters.
Main Methods:
- Utilizing an optomechanical system with two mechanical modes coupled to a cavity mode.
- Parametric driving via time-modulation of mechanical spring coefficients.
- Applying generalized linear response theory and cavity retarded Green's function formalism.
Main Results:
- Achieved a frequency-dependent effective cavity damping rate (ECDR) corresponding to negative CPSF in the red-detuned, weak-coupling regime.
- Negativity is realized by controlling cooperativities and modulation parameters while maintaining system stability.
- Demonstrated enhanced controllability over negative CPSF magnitude and bandwidth with two modulated mechanical modes compared to one.
Conclusions:
- The proposed scheme enables negative absorption (gain) in optomechanical systems, unattainable in standard setups.
- The engineered negativity facilitates a modified optomechanically induced transparency with signal amplification.
- This work paves the way for tunable optomechanical filters and optical transistors with switchable bandwidths.
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