Properties of Large Core Polymer Optical Bend Waveguides

Abstract

We report about properties of large core plastic planar optical bend waveguides. The dimensions of the waveguides were to be compatible with the commonly used plastic optical fiber with diameter 750 µm and the bend radii of the waveguides varied from 30 to 1 mm. The waveguides were made by engraving of a U-groove by using CNC machining into poly(methyl methacrylate) substrate; the waveguide core layers were made of Norland Optical Adhesive UV photopolymer. We experimentally confirmed that fabricated bends may have the total bend losses A for radii 30 mm 4.1 dB/cm at 850 nm, 4.8 dB/cm at 650 nm and 5.63 dB/cm at 532 nm. These bend waveguides are viable for short reach visible and infrared optical communication with easy and low cost installations.

Performance Assessment of Novel Transparent Insulation Materials for Integrated Storage Collectors

“…The transmittance of Bio-PC is comparable to that of PMMA or CA, yielding a refractive index of 1.49, as supported by [12], consistent with the provided datasheet [13]. The solar reflectance stood at approximately 8%, confirming negligible solar absorption.…”

Transparent, low-autofluorescence microECoG device for simultaneous Ca2+imaging and cortical electrophysiologyin vivo

“…Parylene HT shows transparency greater than 90% between 400-980 nm that is remarkably higher than that of polyimide [67] or PET [68], slightly higher than that of Parylene C and similar to that of SU-8 substrates [69] and PDMS [70]. As the principle of twophoton imaging is real-time collection of changes in fluorescence (emitted by fluorescent protein which is interacted with a Ca 2+ -binding protein), therefore relatively low autofluorescence of the polymer substrate is also desired to avoid the disturbing background noise.…”

Fabrication and Characterization of PDMS Waveguides for Flexible Optrodes

“…For bending radii >4 mm, the additional loss amounted to less than −1 dB and to less than −2 dB for a bending radius of 3 mm. The theoretical bending loss (Figure 5C, dashed line) [ 26 ] has been derived from a model which had already proven to match experimental data well. [ 22,27 ]…”