Chemical sensing with microbent optical fiber.
We propose and demonstrate the possibility of using a permanently microbent bare optical fiber for detecting chemical species. Two detection schemes, viz., a bright-field detection scheme (for the core modes), and a dark-field detection scheme (for the cladding modes) have been employed to produce a fiber-optic sensor. The sensor described here is sensitive enough to detect concentrations as low as nanomoles per liter of a chemical species, with a dynamic range of more than 6 orders of magnitude.
T L
TL
S
N A
NA
George
P
P
Sureshkumar
P
P
Radhakrishnan
C P
CP
Vallabhan
V P
VP
Nampoori