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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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A CMOS Image Sensor Based Refractometer without Spectrometry.

Haechang Yang1, Sanghoon Shin1, Samir Kumar1

  • 1Department of Electronics and Information Engineering, Korea University, Sejong 30019, Korea.

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|February 15, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a prism-less surface plasmon resonance (SPR) refractometer using a smartphone camera. This cost-effective device offers high sensitivity for refractive index (RI) detection in various applications.

Keywords:
CMOS image sensorrefractive indexrefractometersmartphonesurface plasmon resonance (SPR)

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Sensor Technology

Background:

  • Refractive index (RI) is a critical material property measured using refractometers.
  • Conventional refractometers often require bulky prisms and expensive spectrometers, limiting their design and portability.
  • Surface Plasmon Resonance (SPR) offers high sensitivity but typically still requires spectrometers.

Purpose of the Study:

  • To develop a prism-less, cost-effective refractive index detector.
  • To integrate SPR technology with a lens-free CMOS image sensor or smartphone camera.
  • To eliminate the need for conventional spectrometer components in RI measurement.

Main Methods:

  • Utilized total internal reflection SPR technology on a silver (Ag) thin film.
  • Combined RI analysis with lens-free CMOS image sensors or smartphone cameras.
  • Employed finite-difference time-domain (FDTD) numerical simulations to optimize Ag film thickness and evaluate performance at different wavelengths.

Main Results:

  • Achieved a maximum sensitivity of -824.54 RIU-1 with a 20 nm Ag film at 559 nm.
  • Demonstrated the feasibility of a prism-less SPR refractometer design.
  • Validated the use of smartphone cameras for RI analysis.

Conclusions:

  • The proposed prism-less SPR refractometer is simple, cost-effective, and highly sensitive.
  • This technology is a promising candidate for point-of-care devices in biological and chemical sensing.
  • Integration with smartphone cameras enhances portability and accessibility for field measurements.