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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

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...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...

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Related Experiment Video

Updated: May 11, 2026

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
08:54

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy

Published on: June 5, 2019

Surface plasmon resonance sensor based on spectral interferometry: numerical analysis.

Yunfang Zhang1, Hui Li, Jingyuan Duan

  • 1Optoelectronic System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.

Applied Optics
|May 15, 2013
PubMed
Summary
This summary is machine-generated.

This study presents a numerical simulation for optimizing surface plasmon resonance (SPR) sensors. The findings suggest specific parameters for enhanced measurement range and sensitivity in SPR sensing applications.

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Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Related Experiment Videos

Last Updated: May 11, 2026

Performing Spectroscopy on Plasmonic Nanoparticles with Transmission-Based Nomarski-Type Differential Interference Contrast Microscopy
08:54

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Published on: June 5, 2019

Implementation of a Reference Interferometer for Nanodetection
16:11

Implementation of a Reference Interferometer for Nanodetection

Published on: April 26, 2014

Area of Science:

  • Optoelectronics
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Surface Plasmon Resonance (SPR) is a label-free optical sensing technique.
  • Optimizing SPR sensor performance is crucial for various applications.
  • Numerical simulations offer a powerful tool for sensor design and optimization.

Purpose of the Study:

  • To introduce a numerical simulation of a phase-detecting SPR scheme.
  • To propose an optimization method for SPR sensors to improve measurement range (MR) and sensitivity.
  • To analyze key parameters influencing SPR sensor performance.

Main Methods:

  • Numerical simulation of a phase-detecting SPR scheme based on spectral interference.
  • Analysis of four critical parameters: light source spectrum, incident angle, gold (Au) film thickness, and prism coupler refractive index.
  • Parametric study to identify optimal conditions for enhanced SPR sensor performance.

Main Results:

  • Optimized parameters for visible light include a warm white broadband source (625-800 nm), incident light divergence < 0.02°, and a 48 nm Au film.
  • Near-IR light sources require thinner Au films, dependent on the specific spectrum.
  • Higher refractive index prism couplers yield a wider MR.
  • Achieved SPR MR of 0.55 refractive index units with sensitivity at 10(-8).

Conclusions:

  • The proposed simulation and optimization method effectively enhance SPR sensor performance.
  • Careful selection of light source, incident angle, Au film thickness, and prism coupler is vital.
  • The optimized SPR sensor demonstrates a significant improvement in measurement range while maintaining high sensitivity.