Volume 9, Issue 1 (International Journal of Optics and Photonics (IJOP) Vol 9, No 1, Winter-Spring 2015)                   IJOP 2015, 9(1): 19-26 | Back to browse issues page

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Ghobadi R, Gholizadeh S, Mazaheri M. Weak Force Measurement in Bistable Optomechanical System. IJOP 2015; 9 (1) :19-26
URL: http://ijop.ir/article-1-190-en.html
Weak Force Measurement in Bistable Optomechanical System
Roohollah Ghobadi1 , Samira Gholizadeh2 , Mojtaba Mazaheri *3
1- University of Calgary
2- University of Mazahndaran
3- Hamedan /university of Technology
Abstract:   (6610 Views)
One of the main milestones in the study of opto-mechanical system is to increase the sensitivity of weak forces measurement up to the standard quantum limit. We have studied the detection of weak force under a bistable condition in red detuned regime. In this case, dynamics of the system behaves asymptotically similar to stationary state and applying external force affects phase and fluctuation of the cavity field. Using the signal to noise ratio, we have found the sensitivity of the system to external force. The system show the maximum sensitivity in the region where bistability approaches zero. We also studied the destructive effects of thermal noise on the sensitivity. Our approach is based on the covariance matrix formalism which can be solved by first Lyapunov theorem.
Keywords: Bistable region, cavity opto-mechanics, force measurement, quantum Langevin equation, red detuned regime.
Full-Text [PDF 270 kb]   (4208 Downloads)    
Type of Study: Research | Subject: Special
Received: 2014/11/17 | Revised: 2015/06/2 | Accepted: 2015/01/19 | Published: 2015/06/2
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