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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...

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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Distributed Bragg Reflectors Employed in Sensors and Filters Based on Cavity-Mode Spectral-Domain Resonances.

Michal Gryga1, Dalibor Ciprian1, Petr Hlubina1

  • 1Department of Physics, Technical University Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic.

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Summary

Distributed Bragg reflectors (DBRs) create spectral-domain resonances for novel optical sensors and filters. These DBR-based resonators offer high sensitivity and narrow spectral widths for precise measurements and filtering applications.

Keywords:
band gapcavity modedistributed bragg reflectorfigure of meritfilterreflectancesensitivitysensorspectral domaintransmittance

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Distributed Bragg reflectors (DBRs) are crucial for creating optical cavities.
  • Understanding spectral-domain resonances in DBR cavities is essential for advanced optical devices.
  • One-dimensional photonic crystals (1DPhCs) offer tunable optical properties.

Purpose of the Study:

  • To theoretically and experimentally analyze spectral-domain resonances in DBR-formed cavities.
  • To investigate the potential of DBRs as high-sensitivity sensors and narrow-band optical filters.
  • To explore a new modeling approach for reflectance and transmittance spectra.

Main Methods:

  • Modeling of reflectance and transmittance spectra using a one-dimensional photonic crystal (1DPhC) model.
  • Utilizing a novel reference reflectance approach to analyze cavity thickness and refractive index (RI) effects.
  • Experimental validation of sensitivity to relative humidity (RH) and performance as spectral filters.

Main Results:

  • High sensitivity (610 nm/RIU) and figure of merit (FOM) (938 RIU-1) for refractive index sensing.
  • Demonstrated sensitivity to relative humidity (0.156 nm/%RH) with an FOM of 0.047 %RH-1.
  • Successful application as spectral filters for LED sources, achieving narrow bandwidths (2.3 nm) at specific wavelengths (680 nm and 780 nm).

Conclusions:

  • DBR-based resonators are effective alternatives for both optical sensors and filters.
  • The proposed method allows for easy resolution of narrow dips within the 1DPhC band gap.
  • Advantages include normal light incidence and narrow spectral width resonances.