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Sensors 2009, 9(6), 4751-4765; doi:10.3390/s90604751
Review

Optical Slot-Waveguide Based Biochemical Sensors

Instituto de Sistemas Optoelectrónicos y Microtecnología (ISOM), ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
Received: 27 May 2009 / Revised: 9 June 2009 / Accepted: 15 June 2009 / Published: 16 June 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain)
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Abstract

Slot-waveguides allow light to be guided and strongly confined inside a nanometer-scale region of low refractive index. Thus stronger light-analyte interaction can be obtained as compared to that achievable by a conventional waveguide, in which the propagating beam is confined to the high-refractive-index core of the waveguide. In addition, slot-waveguides can be fabricated by employing CMOS compatible materials and technology, enabling miniaturization, integration with electronic, photonic and fluidic components in a chip, and mass production. These advantages have made the use of slot-waveguides for highly sensitive biochemical optical integrated sensors an emerging field. In this paper, recent achievements in slot-waveguide based biochemical sensing will be reviewed. These include slot-waveguide ring resonator based refractometric label-free biosensors, label-based optical sensing, and nano-opto-mechanical sensors.
Keywords: integrated optics; slot-waveguides; optical sensors; biosensors integrated optics; slot-waveguides; optical sensors; biosensors
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Barrios, C.A. Optical Slot-Waveguide Based Biochemical Sensors. Sensors 2009, 9, 4751-4765.

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