In this paper we present simulation of transmission / reflection spectra of polymeric rectangular and hexagonal
photonic crystals (PC) as well as the propagation of radiation in a hexagonal PC - based waveguide. The polymeric PC
are periodic structures consisting in square arrays of holes configured in suspended membranes of PMMA with different
diameters and pitch (100 nm diameter with 500 nm, respectively 800 nm pitch; 200 nm diameter with 500 nm pitch; 400
nm diameter with 700 nm pitch).
For fabrication, we propose the bi-layer EBL technique based on simultaneous patterning of a bottom
sacrificial layer (LOR 5A - Microchem Corporation) and a positive electron resist (PMMA of different molecular
weights). Characterization of nanostructures was performed using SEM imaging and AFM measurements .
Poly (vinyl alcohol) [PVA] is a photo-induced cross-linking polymer, water-soluble,
biocompatible, used in holography, nonlinear optics, as tissue engineering scaffolds and as polymer
matrices for enzymes immobilization. PVA has been investigated for use as binder polymer in optical
waveguides for sensor applications. The Y-shaped waveguides is composed of a buffer layer (lower
refractive index) - SiO<sub>2</sub>, a core layer (higher refractive index) - PVA doped for the refractive index and
sensibility increasing and a cladding layer (lower refractive index) - an other polymer. The light
propagation in doped PVA waveguides represents the sensing element of the sensor. The preliminary
results suggest that doped PVA polymers are promising for optical (bio)chemical sensors; the processes
used to make them, represent environmentally friendly technology.