Next Article in Journal
Assessing Herbivore Foraging Behavior with GPS Collars in a Semiarid Grassland
Next Article in Special Issue
Photonic Crystal Structures with Tunable Structure Color as Colorimetric Sensors
Previous Article in Journal
A Zirconium Dioxide Ammonia Microsensor Integrated with a Readout Circuit Manufactured Using the 0.18 μm CMOS Process
Previous Article in Special Issue
Reconfigurable, Defect-Free, Ultrahigh-Q Photonic Crystal Microcavities for Sensing
Article Menu

Export Article

Open AccessReview
Sensors 2013, 13(3), 3675-3710;

Slotted Photonic Crystal Sensors

SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, Scotland KY16 9SS, UK
Author to whom correspondence should be addressed.
Received: 5 January 2013 / Revised: 27 February 2013 / Accepted: 8 March 2013 / Published: 15 March 2013
(This article belongs to the Special Issue Photonic Crystal Sensors)
Full-Text   |   PDF [1509 KB, uploaded 21 June 2014]


Optical biosensors are increasingly being considered for lab-on-a-chip applications due to their benefits such as small size, biocompatibility, passive behaviour and lack of the need for fluorescent labels. The light guiding mechanisms used by many of them results in poor overlap of the optical field with the target molecules, reducing the maximum sensitivity achievable. This review article presents a new platform for optical biosensors, namely slotted photonic crystals, which provide higher sensitivities due to their ability to confine, spatially and temporally, the optical mode peak within the analyte itself. Loss measurements showed values comparable to standard photonic crystals, confirming their ability to be used in real devices. A novel resonant coupler was designed, simulated, and experimentally tested, and was found to perform better than other solutions within the literature. Combining with cavities, microfluidics and biological functionalization allowed proof-of-principle demonstrations of protein binding to be carried out. Higher sensitivities were observed in smaller structures than possible with most competing devices reported in the literature. This body of work presents slotted photonic crystals as a realistic platform for complete on-chip biosensing; addressing key design, performance and application issues, whilst also opening up exciting new ideas for future study. View Full-Text
Keywords: slotted photonic crystal; biosensor; photonic crystal; slot waveguide; microfluidics; label free slotted photonic crystal; biosensor; photonic crystal; slot waveguide; microfluidics; label free
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

MDPI and ACS Style

Scullion, M.G.; Krauss, T.F.; Di Falco, A. Slotted Photonic Crystal Sensors. Sensors 2013, 13, 3675-3710.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top