Vol 6, No 4 (2015) > Electrical, Electronics and Computer Engineering >

Optimizing Coupling Region as Sensing Area in Optical Ring Resonator Sensor Applications

Purnomo Sidi Priambodo, Sasono Rahardjo, Gunawan Witjaksono, Djoko Hartanto


Abstract: Optical Ring Resonators (ORR), whether based on fiber optics or an optical micro ring on
substrate structures have been studied and explored extensively to be used for
optical sensor applications. The outstanding advantage of optical ring
resonator structure is its spectral
response shape change due to the variations of the refractive index of the surrounding medium, medium
loss due to absorption and scattering, and coupling loss between waveguides in the optical ring structure. The
change of spectral response due to the variations of optical medium on the
optical ring structure is a phenomenon that can be used to sense the optical
property change of physical or biological materials. Some developments of Waveguide (WG) ORR
sensors are in progress mostly for bio-sensor applications, since it is free from Electromagnetic
Interference (EMI) and is non-physically destructive. In this paper, we
discuss our research in developing optical bio-sensor in the form of a WG
optical ring resonator. The focus of the research
is optimizing the coupling region as sensing area to obtain the optimal
coupling coefficient for the most sensitive sense. The results show that the
variations of coupling coefficient is not linear with respect to the resonant
peak output, such that we are able to locate the most sensitive coupling
coefficient to sense.
Keywords: Optical bio-sensor; Optical Coupling; Optical Ring Resonator; Resonance; Spectral Response

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