Employing a dual polarisation microring to determine refractive index and thickness of a thin polymer layer

Author

Hoste, J.-W. ; De Geest, Bruno G. ; Bienstman, Peter

Author_Institution

IMEC, Ghent Univ., Ghent, Belgium

fYear

2014

fDate

6-10 July 2014

Firstpage

1

Lastpage

4

Abstract

Dual polarisation biosensing is a novel optical technique that focuses on retrieving structural information from a bound or adsorbed layer of molecules, by using a silicon-on-insulator (SOI) microring. Both density and thickness of the layer can be monitored simultaneously. Due to a self-calibrating protocol that is quickly performed at the start of every experiment, a high accuracy can be obtained. In this paper, we determine the thickness and refractive index of a thin layer of polyethyleneimine (PEI), which adsorbs to the silicon surface of the microring. This results in a layer with a thickness of 1.158 and a refractive index of 1.453 RIU.

Keywords

adsorption; biosensors; elemental semiconductors; micro-optomechanical devices; micromechanical resonators; microsensors; optical sensors; polymer films; refractive index; silicon; Si; adsorbed layer; bound layer; dual polarisation biosensing; dual polarisation microring; optical technique; refractive index; self-calibrating protocol; silicon surface; silicon-on-insulator microring; structural information; thin polyethyleneimine layer; thin polymer layer; Biomedical optical imaging; Couplings; Optical polarization; Optical refraction; Optical resonators; Refractive index; Silicon; biological sensing; optical resonators; polymers;

fLanguage

English

Publisher

ieee

Conference_Titel

Transparent Optical Networks (ICTON), 2014 16th International Conference on

Conference_Location

Graz

Type

conf

DOI

10.1109/ICTON.2014.6876294

Filename

6876294