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Range00:59

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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A plasmonic refractive index sensor with an ultrabroad dynamic sensing range.

Yu-Chieh Cheng1, Ya-Ju Chang2, Yu-Ching Chuang3

  • 1Department of Electro-Optical Engineering, National Taipei University of Technology, 10608, Taipei, Taiwan. yu-chieh.cheng@ntut.edu.tw.

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|March 28, 2019
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Summary

This study presents a novel refractive index sensor using a curved waveguide and gold ring, expanding the detection range significantly. The new design offers ultrahigh resolution for both gas and liquid samples.

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Area of Science:

  • Photonics and Sensor Technology
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Surface plasmon resonance (SPR) sensors offer high sensitivity but are limited by a narrow detection range for refractive index changes.
  • The sensitivity of SPR sensors is dependent on the derivative of monitored parameters near resonance, restricting their application scope.

Purpose of the Study:

  • To enhance the detection range of refractive index sensors.
  • To develop a sensor with a linear response over an ultrabroad refractive index range.
  • To enable integrated photodetectors for lab-on-chip sensor platforms.

Main Methods:

  • A high-contrast-index curved waveguide surrounded by an outer gold ring was designed.
  • The sensor's performance was evaluated based on output power measurement.
  • Theoretical calculations were performed to determine refractive index resolution.

Main Results:

  • The proposed sensor demonstrates a linear response for refractive index changes from n=1 to 2.36.
  • An ultrahigh theoretical refractive index resolution of 4.53 × 10-10 RIU was achieved.
  • The technique is applicable to both gas and aqueous chemical samples.

Conclusions:

  • The novel sensor design significantly broadens the detection range for refractive index measurements.
  • The power detection approach facilitates integration with photodetectors for compact, multifunctional sensor-on-chip devices.
  • This technology holds high potential for advanced lab-on-chip applications requiring high sensitivity and broad range detection.