Optical parameters (refractive index, dispersion energy, optical gap) of polymethylmethacrylate (PMMA) layers prepared by spin coating and modified by electric field have been studied. Refractive index was measured using a refractometer, internal structure was investigated as a structural parameter (Ed) within the One Oscillator Model. Optical gap width (Egopt) was assessed using Tauc Approximation from UV-Vis spectra. Surface morphology and roughness was investigated using an AFM. The electric field imposed during preparation of layers increases their refractive index. The highest increase in n (Δn = 0.042) was found for the thinnest PMMA layer (70 nm). Oriented layers have produced higher Egopt than non-oriented ones for all studied values of thickness. The electrical field applied at preparation of the oriented layer will not change its surface morphology and roughness.

Thickness dependence of refractive index and optical gap of PMMA layers prepared under electrical field

We prepared micron and submicron polymethylmethacrylate (PMMA) layers by the spin-coating method. We investigated the possibility to orientate polymer dipoles in electric field in the glass transition area (T
 g) and the fluid temperature of PMMA with the aim to increase its refractive index (n) after the layer is cooled below T
 g. We have studied the effect of electric field (up to 12 kV cm−1) on change of surface morphology of the layer, dependence of n and contact angle (surface wettability) on the field and dependence of layers orientation on orientation of electric field. The surface morphology was examined using atomic force microscopy (AFM), contact angles were measured by goniometer, film thickness was measured by profilometer, refractive index of films was determined using refractometer. The change of refractive index as dependent on the PMMA layer orientation in electric field depends on temperature and electric field. The highest change in n was found for electric field 11 kV cm−1. The change in contact angle (wettability) on surface of an orientated PMMA layer confirms the dipoles orientation in electric field unambiguously. The orientation of layers causes a “slight” change in their morphology and a “slight” increase of surface roughness only for one direction of field effect. Change in colour for oriented layers does not depend on orientation of electric field.

Refractive index of polymethylmethacrylate oriented by fluid temperature under electrical field

We report about design and construction of the bidirectional transceiver TRx module for subscriber part of the passive
optical network PON for a fiber to the home FTTH topology. The TRx module consists of a epoxy novolak resin
polymer planar lightwave circuit (PLC) hybrid integration technology with volume holographic grating triplex filter
VHGT, surface-illuminated photodetectors and spot-size converted Fabry-Perot laser diode in SMD package. The
hybrid PLC has composed from a two parts-polymer optical waveguide including VHGT filter section and
a optoelectronic microwave section. The both parts are placed on the composite substrate.

Design and construction of a VHGT-attached WDM-type triplex transceiver module using polymer PLC hybrid integration technology

We report about design and construction of the bidirectional transceiver module for subscriber part of the passive optical network PON for a fiber to the home FTTH topology. The TRx module consists of a epoxy novolak resin polymer planar lightwave circuit PLC hybrid integration technology with volume holographic grating triplex filter VHGT, surface-illuminated photodetectors and spot-size converted Fabry-Perot laser diode in SMD package. The hybrid PLC has composed from a two parts - polymer optical waveguide and VHGT filter section and a optoelectronic microwave section. The both parts are placed on the composite substrate.

Design and Construction of a VHGT-Attached WDM - Type Triplex Transceiver Module Using Polymer PLC Hybrid Integration Technology

We report about more detail design and constructions of the WDM triplex optical receive part of the triplex transceiver module for subscribe part passive optical network PON-FTTH. The triplex optical receiver module consists of a epoxy novolak resin polymer or a microoptic planar lightwave circuit (PLC) made by hybrid integration technology with volume holographic grating triplex filter VHGT and surface-illuminated photodetectors in SMD package. The hybrid PLC has composed from two parts - a microoptical or polymer planar optical waveguide including VHGT filter section and an optoelectronic microwave section. The both parts are placed on the composite substrate.

V. Švorčík

Papers

Polymethylmethacrylate optical waveguides prepared in electrical field