  The photonic modes mediated absorption dynamics at femtosecond time scales
along with the control of spontaneous emission tunability are investigated
all-dielectric optical microcavity having BaTiO3 (BTO) as defect layer. The
cavity-enhanced transient absorption reveals the dominant excited state
absorption (ESA) of both photonic and electronic modes due to strong
third-order optical nonlinearity influence. Photoluminescence of BTO is found
to be guided and tuned by the photonic cavity mode. Such active photonic
structures can be envisaged as a potential candidate in nonlinear optics and
photonic device applications.
