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IR Spectrometers

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...

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Related Experiment Video

Updated: May 8, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

Reflective-type guided-mode resonance sensor system based on interference line fringe shifting.

Wen-Kai Kuo, Yi-Jyun Zeng, Ping-Yang Chen

|December 19, 2025

Summary

This summary is machine-generated.

This study introduces a novel refractive index (RI) sensing system using a guided-mode resonance (GMR) sensor. The system achieves high sensitivity for detecting RI changes, showing potential for advanced biosensing applications.

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Last Updated: May 8, 2026

Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

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Published on: April 26, 2014

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Published on: September 30, 2019

Area of Science:

Optoelectronics
Nanophotonics
Biosensing

Background:

Refractive index (RI) sensing is crucial for various applications, including chemical analysis and biological detection.
Previous methods often relied on spectrometers or image sensors to detect RI changes.
Guided-mode resonance (GMR) sensors offer label-free detection capabilities.

Purpose of the Study:

To propose and demonstrate a novel reflective-type GMR sensing system.
To utilize a bi-cell photodiode for detecting interference bright fringe line shifts.
To achieve a low-cost, compact, and highly sensitive RI sensing system.

Main Methods:

A converging laser beam was focused onto a reflective-type GMR sensor.
The reflected light formed a bright fringe line on a bi-cell photodiode.
RI changes on the sensor surface caused the bright fringe line to shift, detected via differential photodiode voltages.

Main Results:

The proposed system demonstrated an average detection sensitivity of 15.8 V/RIU.
The method successfully detected RI changes in aqueous sugar solutions.
The system proved to be low-cost and compact.

Conclusions:

The reflective-type GMR sensor with a bi-cell photodiode offers a sensitive RI detection method.
This approach presents excellent potential for developing cost-effective and compact biosensors.
The bright fringe line shift detection is a viable alternative to traditional methods.