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SPR (Surface Plasmon Resonance) Portable Chemical Sensing Instruments

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karmac
6 diapositives · 214 Views · Jan 03, 2020

This project led by Graduate Research Assistant Mike Warren focuses on developing Surface Plasmon Resonance (SPR) portable chemical sensing instruments. The target systems include side and top views with features such as chemically sensitive coatings, gold interface layers, and waveguides. Collaboration with Arizona State University aims to enhance chemically sensitive coatings and waveguide technologies. Short-term goals involve demonstrating integrated optical computing for environment compensation, while long-term goals aim to integrate the SPR optical train onto a micromachined platform and develop a dual probe system for tracking reference and sensing environments simultaneously. The project emphasizes advantages like low cost, low power consumption, and robustness to varying background levels.

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  1. SPR (Surface Plasmon Resonance)Portable Chemical Sensing Instruments Graduate Research Assistant: Mike Warren, mwarren@u.washington.edu Funding Source: Subcontract to Arizona State University National Science Foundation Grant Karl Booksh, Department of Chemistry and BioChemistry (PI) 9/00-2/02

  2. SPR (Surface Plasmon Resonance)Portable Chemical Sensing Instruments Target System: Side View Polychromatic Light Chemically sensitive coating Gold Interface layer Waveguide Dielectric Color Filter Photodiode (includes integrated optical computing) Inlet Port Outlet Port Silicon Substrate Collaboration with Karl Booksh, Department of Chemistry, Arizona State University

  3. Chemically sensitive coating Waveguide Gold Interface layer SPR (Surface Plasmon Resonance)Portable Chemical Sensing Instruments Target System: Top View Analog Photodiode Outputs time Digital Alarm Outputs

  4. SPR (Surface Plasmon Resonance)Portable Chemical Sensing Instruments • Research Goals: Short Term (First 18 months) • Demonstrate Integrated Optical Computing for compensating any arbitrary reference environment • Reduce output from photodetectors (directly) to the difference between the reference and present environment • Extract two points from SPR array between which lies the minimum in the spectrum • Use massively parallel, analog circuits to compute, in real-time the true minimum between these selected points • Proof-of-concept: compute (reference-independent) concentration directly from photodetectors and analog circuits in real-time using “non-integrated” SPR system

  5. SPR (Surface Plasmon Resonance)Portable Chemical Sensing Instruments • Research Goals: Long Term (Years 2-4) • Integrate SPR optical train onto a micromachined platform • Develop dual probe system to track reference envionrment (bulk refractive index) and sensing environment (analyte-dependent refractive index) simulatenously • Characterize resolution of minimum detection scheme (concentration limits) • Demonstrate effective integration of optical train, photodetectors, and processing circuits onto a single chip.

  6. LED Source Coated SPR Probe (Analyte Specific) Uncoated SPR Probe (Reference) Photodiode array (with integrated optical computing for reference compensation) Virtual Point Array (minimum detection) 1 . . . . . n 1 . . . . . n SPR (Surface Plasmon Resonance)Portable Chemical Sensing Instruments Optical Train Sensors Signal Stream Silicon/Analog Circuits • Advantages of this Approach • Low-Cost • Low-Power • Small Space Requirements • Low Imager Resolution Requirements • Image Processing optimized to chemical • Sensing application • Automated Calibration • Robustness to varying “background” levels Optical Fiber Analyte concentration