Huge confinement of light over micro and nano structures is finding various applications in the field of
photonics. In this letter the results obtained over two different kinds of confined structures viz., (i) Metallo-Dielectric
colloidal structures (MDCS), obtained by immobilization of metallic gold (Au) nanoparticles on the dielectric silica
network of inverse silica opal matrix and (ii) Rare-earth activated silica-hafnia film coated silica microresonator is
presented in detail. The structural, optical and spectroscopic assessments of these systems are giving an evidence to have
applications in the field of sensing and lasing.
Preliminary results on MDCS used as surface enhanced Raman scattering (SERS) substrate shows an evidence
that an increase of the Raman signal with respect to that observed for other metallic and dielectric structures.
We report the angle dependent transmission spectral characteristics of 331 nm diameter polystyrene (PS) photonic
crystals (PhCs) with large band gap depth and steeper band edges which allow one to identify different Bragg planes
promptly. The spectral characteristics recorded in the clock-wise (CW) and anti clock-wise (ACW) directions follow the
LK and LU paths in the first Brillouin zone (FBZ) of the face centered cubic (fcc) structure. We obtained 25% of the
band gap depth for (220) plane in the LK path, which is the highest value reported till now to the best of our knowledge.
Interestingly we observed that (200) plane features for lower angles and (111) plane features for higher angles in the LU
path while in the LK path the dips follow the (111) plane fit completely from lower angles to higher angle of incidence
and the possible reasons are discussed.
We report the synthesis of polystyrene (PS) nanospheres through emulsion polymerization and fabrication of
three dimensional PS photonic crystals (PhCs) with good crystalline quality using vertical deposition method. The
reflection and transmission spectral characteristics of the PhCs fabricated from the pure and dye doped PS
nanospheres are compared.