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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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The Electromagnetic Spectrum02:37

The Electromagnetic Spectrum

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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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Related Experiment Video

Updated: Feb 7, 2026

In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation
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Mid-infrared plasmonic multispectral filters.

Ang Wang1, Yaping Dan2,3

  • 1State Key Laboratory of Advanced Optical Communication Systems and Networks, University of Michigan-Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University, Shanghai, 200240, China.

Scientific Reports
|July 28, 2018
PubMed
Summary
This summary is machine-generated.

This study presents a miniaturized spectral analyzer using gold subwavelength hole arrays for versatile applications. The device demonstrates accurate infrared spectral analysis, proving its potential for chemical analysis and disease diagnosis.

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Area of Science:

  • Nanophotonics
  • Infrared Spectroscopy
  • Materials Science

Background:

  • Miniaturized spectral analyzers are crucial for portable, non-invasive diagnostics and monitoring.
  • Existing technologies often lack the required portability and versatility for diverse applications.

Purpose of the Study:

  • To develop an integrated, miniaturized mid-infrared spectral analyzer.
  • To utilize gold subwavelength hole arrays as tunable multispectral filters.

Main Methods:

  • Fabrication of gold subwavelength hole arrays using CMOS-compatible processes.
  • Tuning transmission peaks from 3 µm to 14 µm by adjusting hole periodicity.
  • Utilizing Fourier transform infrared (FTIR) microscopy for transmission mapping.
  • Developing an IR spectral analyzer model for chemical analysis.

Main Results:

  • Demonstrated continuous tuning of transmission peaks across the mid-infrared spectrum.
  • Confirmed selective wavelength transmission for each hole array.
  • Successfully retrieved IR spectral information of test samples using the developed analyzer.
  • Observed spectral patterns from the integrated analyzer closely matched FTIR spectra.

Conclusions:

  • The developed integrated spectral analyzer shows significant potential for chemical analysis.
  • The use of tunable subwavelength hole arrays offers a promising route for miniaturized spectroscopic devices.
  • This technology could enable portable, non-invasive applications in disease diagnosis, environmental monitoring, and food safety.