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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...

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All optical tunable RF filter using elemental antimony.

Samarth Aggarwal1, Nikolaos Farmakidis1, Bowei Dong1

  • 1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

We developed a compact microwave photonic filter using antimony for all-optical radio frequency filtering. This integrated unit demonstrates low-pass filtering and envelope detection for advanced signal processing needs.

Keywords:
all-optical filterlow-pass filtermicrowave photonicsthin-film antimony

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Area of Science:

  • Photonics and Optical Engineering
  • Microwave Photonics
  • Materials Science

Background:

  • The proliferation of 5G and the Internet-of-things (IoT) has driven a significant increase in data generation and transmission.
  • This surge necessitates advanced signal processing capabilities, creating demand for high-bandwidth, low-latency solutions.
  • Microwave photonic (MWP) processors leverage optical systems to meet these demands.

Purpose of the Study:

  • To introduce an integrated microwave photonic processing unit for all-optical radio frequency (RF) filtering.
  • To utilize the unique crystallisation dynamics of elemental antimony for photonic applications.
  • To demonstrate a novel photonic leaky integrator configured as a low-pass filter.

Main Methods:

  • Development of an integrated MWP processing unit.
  • Exploitation of antimony crystallisation dynamics to create a photonic leaky integrator.
  • Configuration of the device as a first-order low-pass filter and experimental demonstration as an envelope detector.

Main Results:

  • Demonstration of an ultra-compact (16 × 16 μm²) photonic leaky integrator.
  • Achieved a first-order low-pass filter with a bandwidth of 300 kHz.
  • Successful experimental implementation as an envelope detector for amplitude-modulated signal demodulation.

Conclusions:

  • The integrated MWP unit offers a promising solution for all-optical RF filtering.
  • Antimony's crystallisation dynamics enable the creation of compact and efficient photonic signal processing components.
  • The presented filter design shows potential for bandwidth tunability in future iterations.