Nanoscale Plasmonic Interferometers for Multispectral, High-Throughput Biochemical Sensing. Nano Letters. 12(2):602-609.. 2012.
|Title||Nanoscale Plasmonic Interferometers for Multispectral, High-Throughput Biochemical Sensing|
|Publication Type||Journal Article|
|Year of Publication||2012|
|Authors||Feng J, Siu VS, Roelke A, Mehta V, Rhieu SY, Palmore TGR, Pacifici D|
|Pagination||602 - 609|
|Keywords||; biosensor, focused ion beam (FIB) millin, glucose sensor, nanogrooves, nanoslits, Plasmonic interferometers, surface plasmon polariton (SPP)|
In this work, we report the design, fabrication, and characterization of novel biochemical sensors consisting of nanoscale grooves and slits milled in a metal film to form two-arm, three-beam, planar plasmonic interferometers. By integrating thousands of plasmonic interferometers per square millimeter with a microfluidic system, we demonstrate a sensor able to detect physiological concentrations of glucose in water over a broad wavelength range (400–800 nm). A wavelength sensitivity between 370 and 630 nm/RIU (RIU, refractive index units), a relative intensity change between 103 and 106 %/RIU, and a resolution of 3 × 10–7 in refractive index change were experimentally measured using typical sensing volumes as low as 20 fL. These results show that multispectral plasmonic interferometry is a promising approach for the development of high-throughput, real-time, and extremely compact biochemical sensors.
|Short Title||Nano Lett.|