Abstract
We demonstrate a novel silicon-on-insulator dual-microring resonator
for sensing application. Numerical analysis shows that the Q factor of dual-microring
resonator is three orders of magnitude higher than that of conventional single-ring
resonator with lossless waveguide and thereby as a sensor, the resolution
and minimum level of detection is enhanced greatly. For the resonance peak
of inner ring, a Q value of $1.07
\times 10^{7}$ is achieved theoretically in weak coupling
conditions while the sensing area is kept below 50$\,\times\,$50 $\mu$m$^{2}$. Detection limit of refractive index
change of $3.85 \times 10^{-6}$ can be achieved for bulk refractive index sensing. Moreover, by
enlarging bending radius of the outer ring, Q factor can be further improved.
The analytical description of output spectrum response is derived. In addition,
for low propagation loss waveguide, critical coupling condition of two rings
and bus waveguides is obtained and it's essential for sensor device optimization.
© 2011 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription