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Microbial Biosensors01:17

Microbial Biosensors

Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...

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Related Experiment Video

Updated: Jun 8, 2026

Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
10:59

Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors

Published on: February 10, 2014

Metal phosphate planar waveguides for biosensors.

A N Sloper, M T Flanagan

    Applied Optics
    |October 12, 2010
    PubMed
    Summary

    Metal phosphate films fabricated via spin-coating offer a cost-effective solution for biosensor waveguides. Researchers identified optimal compositions and processing parameters for tunable optical and physical properties, enabling versatile applications.

    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optical Engineering

    Background:

    • Development of advanced materials for biosensing applications is crucial.
    • Metal phosphate films offer potential for optical waveguide fabrication.
    • Existing fabrication methods may be costly or limited in scope.

    Purpose of the Study:

    • To develop an inexpensive method for fabricating hard, impermeable metal phosphate films.
    • To identify films suitable for monomode waveguides in biosensors.
    • To characterize the optical and chemical properties of these films.

    Main Methods:

    • Utilized spin-coating and low-temperature curing for film deposition.
    • Investigated films composed of Fe, Al, Ga, In, Cr, and V.
    • Analyzed optical properties (refractive index) and chemical properties.

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    Last Updated: Jun 8, 2026

    Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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  • Controlled film thickness (50-1200 nm) via spin speed and deposition temperature.
  • Demonstrated patterning using photolithography and embossing.

    • Main Results:

    • Achieved inexpensive fabrication of glassy metal phosphate films.
    • Controlled refractive index in the range of 1.49-1.78 by adjusting film composition.
    • Precisely controlled film thickness between 50-1200 nm.
    • Successfully patterned films using photolithography and embossing.
    • Demonstrated input coupling via an 833-nm pitch embossed grating.

    Conclusions:

    • Spin-coating and low-temperature curing provide an effective, low-cost route to metal phosphate films.
    • These films exhibit tunable optical and physical properties suitable for biosensor waveguides.
    • The demonstrated patterning capabilities open avenues for integrated optical biosensor devices.