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Vol. 135, Issue 12, December 2011, pp.134-145




A Novel Bio-Chemical Sensor Based on the Microsphere Raman Laser in the Presence of an External Non metallic Mirror


1Department of Physics Sharif University of Technology, Tehran, Iran

Tel.: +982166164527

2 International Center of Science & High Technology & Environmental Sciences (ICST), Kerman, Iran, Tel.: +982144513909

 E-mail: bahrampour@sharif.edu, azamgholampour2002@yahoo.com



Received: 25 September 2011   /Accepted: 16 December 2011   /Published: 28 December 2011

Handbook of Laboaratory Measurements book


Abstract: In the presence of an external nonmetallic mirror in adjacent of a microsphere resonator each of the resonance frequency of the microsphere is split into two different resonance frequencies. The new frequencies are symmetrical around the microsphere resonance frequency. The upper and lower frequencies are called blue and red shifted modes. Depending on the sign of the difference between the ratio of loss to the Raman gain at the blue and red shifted frequencies, one of these modes is stable and the other one is unstable. In this paper on the basis of this effect, two ultra sensitive biochemical sensor design based on the steady state and transient response is proposed. The sensitivity of the sensor based on the steady state regime of operation has its maximum value when the ratio of loss to the Raman gain of red shifted and blue shifted modes have the same value.


Keywords: Biosensor, Microsphere, Raman laser, Sensitivity


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