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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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This study demonstrates rapid, large-area fabrication of plasmonic metamaterials using laser interference lithography (LIL) for ultrasensitive biosensing. The cost-effective, reusable nanoantennas enable simplified, real-time analysis of biological systems.

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Area of Science:

  • Nanotechnology
  • Biomedical Engineering
  • Materials Science

Background:

  • Plasmonic metamaterials offer potential for medical diagnostics but face market entry challenges.
  • Current limitations include bulky optics and small-scale patterning, hindering device miniaturization.

Purpose of the Study:

  • To develop a rapid, large-area fabrication method for plasmonic metamaterials.
  • To enable objective-free optical reading for miniaturized and cost-effective biosensors.

Main Methods:

  • Utilized laser interference lithography (LIL) for large-area (4 cm²) patterning of nanodisc metamaterial absorber nanoantennas.
  • Employed a sacrificial layer for inverted hole profiling and defect-free liftoff.
  • Performed near-IR optical characterization using a macroscopic reflection probe.

Main Results:

  • Achieved rapid, defect-free nanopatterning over a 4 cm² area within minutes.
  • Demonstrated photonic quality comparable to electron-beam lithography.
  • Measured a refractive index sensitivity of 685 nm/RIU, indicating ultrasensitive detection.
  • Confirmed reusability of fabricated surfaces for biosensing without performance loss.

Conclusions:

  • LIL enables efficient, large-area fabrication of high-quality plasmonic metamaterials.
  • The developed biosensing platform offers ultrasensitive, cost-effective, and environmentally friendly real-time biological analysis.
  • This advancement facilitates accurate analysis of biological systems for researchers and industry.