Long-range surface plasmon Y-junctions for referenced biosensing
Document Type
Article
Publication Date
1-1-2015
Abstract
Long-range surface plasmon Y-junctions are demonstrated as sensors for the detection of bulk refractive index changes in solution and for protein binding. Using a fully-cladded Au stripe waveguide as a reference channel, common drift and noise in the system can be eliminated, relaxing the need for precise optical alignments. The performance of the structure is discussed theoretically, then bulk sensing is carried out experimentally with five solutions of different refractive indices, and protein sensing is demonstrated through physisorption of bovine serum albumin on a carboxyl-terminated Au stripe. The Y-junction biosensor demonstrated a very good ability to perform drift and noise suppression for fast and accurate biosensing.
Keywords
Biochemistry, Body fluids, Fiber optic sensors, Proteins, Refractive index
Divisions
fac_eng
Publication Title
Optics Express
Volume
23
Issue
24
Publisher
Optical Society of America