A fast response suspended core fiber optical gas sensor configuration using side-opening hole and micro-holes array
structure on the thin layers is proposed. The side-opening-hole structure enables a fast filling speed of gases into the
opening-up-hole region, while the micro-holes array on the thin layers ensures that gases could further diffuse into
the other holes columns quickly. Meanwhile, its sensitivity could be tripled in contrast to the previous structures.
Simulation results show that a diffusion limited response time of 12 s could be realized and thus move a step further
toward real-time sensing applications.
A fast response tilted fiber Bragg grating fluid refractometer using an exposed-hole microstructured optical fiber is
proposed and analyzed. The theoretical and simulation results show that a sensitivity of 5.40×10<sup>-5</sup> r.i.u within a diffusion
limited response time of 6 s could be achieved. This exposed-hole configuration can be used to construct a fluid
refractometer for achieving a fast response, high sensitive distributed detection.
Since the advent of slot optical waveguides by Lipson, normally SOI based slot optical waveguides have been under consideration. It
has been found that glass based slot optical waveguide structures, where refractive index contrast ratio is comparatively less can also
play important role in forming complex nano size optical devices. We have made use of power confined inside low index slot region
for a double slot structure, where central high index slab is acting as a cantilever. Novel optomechanical sensor has been proposed
based on variation in power confined inside low index slot region due to the movement of central high index slab under the action of
external force (temperature, pressure, humidity, etc.)
Slot waveguide structure gained attention due to high confinement of power inside low index slot region. The high efield
confinement is dependent upon various geometrical parameters. A double slot structure where two low index slots
of hard material in high index cladding of compressible material is proposed. Power confinement factor dependency
upon distance between low index slots has been numerically computed. Sufficient numerical results obtained lead to the
proposal of opto-mechanical sensor based upon proposed double slot structure.