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

Bahrampour, Alireza; Azhir, Azam Gholampour; Taghiabadi, Razie; Yazdi, kazem Rahimi
September 2010
Sensors & Transducers (1726-5479);Sep2010, Vol. 120 Issue 9, p152
Academic Journal
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.


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