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

¹Alireza BAHRAMPOUR, ²Azam GHOLAMPOUR AZHIR, ³Razie TAGHIABADI, ⁴Kazem RAHIMI YAZDI

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

Tel.:+989380337665

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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