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Seminar Announcement: Marian Marciniak

posted Sep 10, 2013, 7:20 AM by Stefano Varas   [ updated Oct 4, 2013, 1:08 AM ]

Monday, 09 September 2013, 10:30 a.m.
Sala Grande Palazzina C via alla Cascata 56/C

Optical slot waveguide microring resonator with liquid crystal filling as optical sensor - optimization guidelines

Marian Marciniak
National Institute of Telecommunications, Szachowa 1, 00-894 Warsaw, Poland

In last years waveguide microring resonators on the base of multiple-slot waveguides have been proposed for sensing applications. It has been shown that such microrings tolerate a larger fabrication errors than single-slot ones. A slot waveguide consists of two strips of a high index material separated by a subwavelength low-index (slot) region. By exploiting the electric field discontinuity at the interface between high-index-contrast materials, high optical intensity can be obtained in the slot low-index region. The slot in such waveguide can be filled by a liquid crystal sensitive to a defined parameter, thus increasing the sensor sensitivity.
Recently, we have analyzed the guided mode transformation in slot and double-slot curved waveguides under variation of their structure (slot width, slot separation, bend radius, etc.) and investigate the sensitivity of single and double-slot microrings with liquid crystal (LC) filling to temperature changes [1].
In this seminar, the dependence of transverse field distribution and effective indices of the two orthogonally polarized modes in slot and double-slot waveguides on waveguide parameters (slot width, slot separation) and bend will be discussed. The sensor sensitivity is strongly related to the mode field distribution in waveguide cross-section, especially to the amplitude of the evanescent wave inside the medium where the sensitive substance is present. Optimization guidelines for microring resonator on the base of such waveguides used as a temperature sensor will be reported.

[1] I. Goncharenko, M. Marciniak, ICTON 2013, Invited Paper Tu.A5.3

Keywords: microring resonator, slot waveguide, optical sensor, liquid crystal, resonant frequency, method of lines.

The seminar will be completed by introducing shortly:
- International Conference on Transparent Optical Networks ICTON organization scheme
- European Cooperation in Science and Technology COST application rules

Stefano Varas,
Sep 10, 2013, 7:22 AM