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Vol. 120, Issue 9, September 2010, pp.152-161




Sensitivity Enhancement of Biochemical Sensors Based on Er+3 Doped Microsphere Coupled to an External Mirror



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

Tel.: +982166164527,

2International Center of Science & High technology & Environmental Sciences, Kerman, Iran

Tel.: +982144513909

3Ferdosi University of Mashhad, Mashhad, Iran


4Sharif University of Technology

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



Received: 28 August 2010   /Accepted: 14 September 2010   /Published: 27 September 2010


Abstract: In this paper we proposed an active optical sensor designed based on the Er+3-doped microsphere coupled to an external mirror. The microsphere-mirror coupling causes the degeneracy splitting of the resonance frequencies. Each of resonance frequencies splits in to two different resonance frequencies .The coupling coefficient changes as a result of altering the refractive index of surrounding medium. So, the presence of bio/chemical analytes can be detected by measuring the change of laser output power, laser frequency or the difference between frequencies of the red and blue shifted modes. In the presence of mirror at least one order of magnitude sensitivity enhancement is obtained relative to the active microsphere biochemical sensors.


Keywords: Biosensor, Erbium, External feedback, Microsphere


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