Manufacturing arbitrarily-shaped active waveguides with liquid crystal cladding

Caño García, Manuel and Delgado, Rodrigo and Zuo, Tianyi and Geday, Morten Andreas and Quintana Arregui, Patxi Xabier and Otón Sánchez, José Manuel (2015). Manufacturing arbitrarily-shaped active waveguides with liquid crystal cladding. In: "16th Topical Meeting on the Optics of Liquid Crystals (OLC'2015)", 13/09/2015 - 18/09/2015, Sopot, Poland. pp. 1-2.

Description

Title: Manufacturing arbitrarily-shaped active waveguides with liquid crystal cladding
Author/s:
  • Caño García, Manuel
  • Delgado, Rodrigo
  • Zuo, Tianyi
  • Geday, Morten Andreas
  • Quintana Arregui, Patxi Xabier
  • Otón Sánchez, José Manuel
Item Type: Presentation at Congress or Conference (Article)
Event Title: 16th Topical Meeting on the Optics of Liquid Crystals (OLC'2015)
Event Dates: 13/09/2015 - 18/09/2015
Event Location: Sopot, Poland
Title of Book: 16th Topical Meeting on the Optics of Liquid Crystals (OLC'2015)
Date: 2015
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Many photonic devices are based on waveguides (WG) whose optical properties can be externally modified. These active WGs are usually obtained with electrooptic materials in either the propagating film (core) or the substrate (cladding). In the second case, the WG tunability is based on the interaction of the active material with the evanescent field of the propagating beam.Liquid crystals (LCs) are an excellent choice as electrooptic active materials since they feature high birefringence, low switching voltage, and relatively simple manufacturing. In this work, we have explored alternative ways to prepare WGs of arbitrary shapes avoiding photolithographic steps. To do this, we have employed a UV laser unit (Spectra Physics)attached to an xyzCNC system mounted on an optical bench. The laser power is 300mW, the spot size can be reduced slightly below 1 µm, and the electromechanicalpositioning is well below that number.Different photoresinshave been evaluated for curing time and uniformity; the results have been compared to equivalent WGs realized by standard photolithographic procedures. Best results have been obtained with several kinds of NOA adhesives (Norland Products Inc.) and SU8 (Microchem). NOA81 optical adhesive has been employed by several groups for the preparation ofmicrochannels [1] and microfluidic systems[2]. In our case, several NOAs having different refractive indices have been tested in order to optimize light coupling and guiding. The adhesive is spinnedonto a substrate, and a number of segmented WGs are written with the laser system. The laser power is attenuated 20 dB. Then the laser spot is swept a number of times (from 1 to 900) on every segment. It has been found that, for example, the optimum number of sweeps for NOA81 is 30-70 times (center of the figure) under these conditions. The WG dimensions obtained with this procedure are about 7 µm high and 12 µm wide.

Funding Projects

TypeCodeAcronymLeaderTitle
Madrid Regional GovernmentSINFOTON S2013/MIT-2790)UnspecifiedUnspecifiedUnspecified
Government of SpainEC2013-47342-C2UnspecifiedUnspecifiedUnspecified

More information

Item ID: 38269
DC Identifier: http://oa.upm.es/38269/
OAI Identifier: oai:oa.upm.es:38269
Deposited by: Memoria Investigacion
Deposited on: 31 Oct 2016 19:51
Last Modified: 31 Oct 2016 19:51
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