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Title: Slow light Mach-Zehnder interferometer as label-free biosensor with scalable sensitivity

Journal Article · · Optics Letters
DOI:https://doi.org/10.1364/OL.41.000753· OSTI ID:1237162
 [1];  [1];  [2];  [2];  [1]
  1. Vanderbilt Univ., Nashville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Our design, fabrication, and characterization of a label-free Mach–Zehnder interferometer (MZI) optical biosensor that incorporates a highly dispersive one-dimensional (1D) photonic crystal in one arm are presented. The sensitivity of this slow light MZI-based sensor scales with the length of the slow light photonic crystal region. The numerically simulated sensitivity of a MZI sensor with a 16 μm long slow light region is 115,000 rad/RIU-cm, which is sevenfold higher than traditional MZI biosensors with millimeter-length sensing regions. Moreover, the experimental bulk refractive index detection sensitivity of 84,000 rad/RIU-cm is realized and nucleic acid detection is also demonstrated.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1237162
Journal Information:
Optics Letters, Vol. 41, Issue 4; ISSN 0146-9592
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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Slow light enhanced bio sensing properties of silicon sensors journal October 2019
Human heart failure biomarker immunosensor based on excessively tilted fiber gratings journal December 2016
High sensitivity and label-free oligonucleotides detection using photonic bandgap sensing structures biofunctionalized with molecular beacon probes journal January 2018
Improving the detection limit for on-chip photonic sensors based on subwavelength grating racetrack resonators journal January 2017
Optimizing band-edge slow light in silicon-on-insulator waveguide gratings journal January 2018
Fundamental limit of detection of photonic biosensors with coherent phase read-out journal January 2019
Coexistence of air and dielectric modes in single nanocavity journal January 2019
Modal interferometric refractive index sensing in microstructured exposed core fibres journal January 2019
Dispersion engineering and thermo-optic tuning in mid-infrared photonic crystal slow light waveguides on silicon-on-insulator journal January 2018
Integrated Optical Mach-Zehnder Interferometer Based on Organic-Inorganic Hybrids for Photonics-on-a-Chip Biosensing Applications journal March 2018
Silicon Photonic Biosensors Using Label-Free Detection journal October 2018
Automated Chemical Sensing Unit Integration for Parallel Optical Interrogation journal February 2019
Silicon Photonic Biosensors Using Label-Free Detection text January 2019
Modal interferometric refractive index sensing in microstructured exposed core fibres text January 2019