Kharat, Haridas J. Kakde, Kishor P. Shirale, Dhammanand J. Gade, Vikas K. Gaikwad, Pradeep D. Savale, Padmakar A. Shirsat, Mahendra D.
Verschenen in:
Fiber & integrated optics
Paginering:
Jaargang 25 (2006) nr. 6 pagina's 411-422
Jaar:
2006-12-01
Inhoud:
Evanescent wave configuration has been extensively used in the development of fiber-optic sensor for different biomedical applications. In the present investigation we have theoretically proposed the designing of single-mode and multimode optical fiber sensing probes, which can be prepared by removing a few centimeters of cladding near the distal end of the step index optical fiber. In this theoretical study, we found that the removal of cladding causes V-number mismatching and this has led to the loss of signal acquisition from the sensing region. Therefore, to minimize these losses we have proposed to reduce the radius by step etch and tapering technique. It was found that step etching and tapering enhances the strength and penetration depth of the evanescent wave significantly.