Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2009 Jun 16;9(6):4751–4765. doi: 10.3390/s90604751

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

Figure 8. — Schematic top view of a directional coupler formed by slot-waveguides. Variation of the refractive index in the sensing region alters both P₁ and P₂ output powers. κ_d is the coupling coefficient between the slot-waveguides.