Nanophotonic biosensors within lab on chip optical systems

Daniel Hill*

*Corresponding author for this work

Research output: Chapter in Book/Published conference outputConference publication


For ring resonator based sensors, volumetric limits of detection (LoD) of 5×10-6 RIU and 8.3×10-6 RIU (refractive index units) for sensitivities of 246nm/RIU and 2169nm/RIU were reported from FP6 SABIO (at 1.31μm) and FP7 InTopSens (at 1.55μm) respectively. These compare well to the state of art of 7.6×10-7 RIU for a sensitivity of 163 nm/RIU, as does the porous alumina based membrane sensors in FP7 Positive with their LoD of 5×10-6 RIU. More interestingly for the membrane sensors, the standard deviation of their measured values was below 5% and their flow through design with lateral distances to the sensor surface less than a diffusion length permit fast response times, short assay times and the use of small sample volumes (< 100 μl). For protein binding recognition, within SABIO a surface LoD of 0.9 pg/mm2 for anti-BSA on a gluteraldehyde-covered surface was recorded, corresponding to a 125ng/ml anti-BSA solution, whilst in InTopSens 5pg/mm2 and 10ng/ml for biotin on a streptavidin coated surface was seen. For an assay of β-lactoglobulin - anti-P-lactoglobulin - anti-rabbit-IgG-streptavidin conjugated CdSe quantum dots the Positive sensors demonstrated a noise floor for individual measurements of 3.7ng/ml (25pM) for total assay times of under one hour.

Original languageEnglish
Title of host publicationPHOTOPTICS 2015 - 3rd International Conference on Photonics, Optics and Laser Technology, Proceedings
EditorsPaulo A. Ribeiro, Maria Raposo
Number of pages9
ISBN (Electronic)9789897580932
Publication statusPublished - 1 Jan 2015
Event3rd International Conference on Photonics, Optics and Laser Technology, PHOTOPTICS 2015 - Berlin, Germany
Duration: 12 Mar 201514 Mar 2015


Conference3rd International Conference on Photonics, Optics and Laser Technology, PHOTOPTICS 2015


  • Biosensing
  • Birefringence
  • Lab-on-chip
  • Nanophotonics
  • Porous silicon
  • Quantum dots
  • Ring resonators
  • Slot-waveguides


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