In this work, a PDMS-packaged MCR with high quality factor has been
demonstrated. PDMS for packaging MCR was diluted with hexane so the MCR coil
could turn around easily. The quality factor was 5 x 105 and the performance could
maintain for 5 days. With high quality factor and a stable MCR structure,
PDMS-packaged MCR could serve as RI sensor with low detection limit. A 4-layer PMMA
structure was designed to support PDMS-packaged MCR and glucose solutions were
used for different RI. The experiment results showed the resonance dips shifted linearly
and the detection limit was 7 x 10-4. To increase the potential of practical applications,
long-term stability of MCR was further improved by protecting microfibers with UV
glue. In UV curing process, UV glue was covered with PE thin film to prevent oxygen
inhibition. The performance of MCR could maintain over a month without degradation.
Such MCRs with high quality factor and long-term stability might be useful in nonlinear
optics.
When an optical fiber is drawn into a microfiber, the nonlinear interaction occurs
in the narrow microfiber waist. Microfiber allows light to be funneled into a small area,
increasing its intensity and promoting nonlinear effect. Besides, a resonator with high
51
In 2015, Y. Wang et. al., presented an all optical control based on microfiber knot
resonator and graphene. The light-graphene interaction can be strongly enhanced via
the resonantly circulating light [52]. Therefore, PDMS-packaged MCRs have strong
nonlinearity and can provide a stable structure for nonlinear optics. Recently, the
combination of semiconductor materials with fiber optics has become one of the
emerging research topics. We have the ability to produce silicon-cored fibers with high
quality by vertical-drawing [53]. The nonlinear effect of silicon is stronger than silica.
We can fabricate PDMS-packaged MCR with microfiber drawn from silicon-cored
fiber. PDMS-packaged MCR combined with silicon-cored fiber would have strong
nonlinear effect and potential for nonlinear applications.
In addition to the nonlinear application, MCRs with high quality factor have the
potential to be good lasing element. In 2006, X. Jiang et. al., demonstrated a microfiber
laser formed by tightening a doped microfiber into a microfiber knot resonator [54].
With high quality factor and long-term stability, PDMS-packaged MCR could supply
good condition for lasing. We could draw the fiber with high gain doping into
microfiber and use the microfiber to fabricate PDMS-packaged MCR. The MCR based
laser is likely to be realized.
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