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Related Concept Videos

Upsampling01:22

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...
Downsampling01:20

Downsampling

When considering a sampled sequence with zero values between sampling instants, one can replace it by taking every N-th value of the sequence. At these integer multiples of N, the original and sampled sequences coincide. This process, known as decimation, involves extracting every N-th sample from a sequence, thereby creating a more efficient sequence.
The Fourier transform of the decimated sequence reveals a combination of scaled and shifted versions of the original spectrum. This...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Related Experiment Video

Updated: Jun 19, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
10:42

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing

Published on: March 22, 2019

Surface spontaneous parametric down-conversion.

Jan Perina1, Antonín Luks, Ondrej Haderka

  • 1Joint Laboratory of Optics of Palacký University and Institute of Physics of Academy of Sciences of the Czech Republic, 772 07 Olomouc, Czech Republic.

Physical Review Letters
|October 2, 2009
PubMed
Summary
This summary is machine-generated.

Surface spontaneous parametric down-conversion, a key quantum optics phenomenon, is predicted due to field continuity at nonlinear material interfaces. This effect, important in layered structures, extends our understanding of nonlinear optics.

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Area of Science:

  • Nonlinear Optics
  • Quantum Optics
  • Materials Science

Background:

  • Spontaneous parametric down-conversion (SPDC) is a fundamental process in quantum optics.
  • Typically, SPDC is analyzed within bulk nonlinear media.
  • Continuity of electromagnetic fields at interfaces is a crucial physical principle.

Purpose of the Study:

  • To predict and theoretically describe surface-induced spontaneous parametric down-conversion.
  • To generalize the description of two-photon spectral amplitudes for surface effects.
  • To investigate the significance of surface contributions in specific nonlinear structures.

Main Methods:

  • Theoretical prediction based on electromagnetic field continuity at interfaces with a second-order nonlinear susceptibility (χ(2)) discontinuity.
  • Development of a generalized two-photon spectral amplitude formalism.
  • Analysis of nonlinear layered structures and periodically poled nonlinear crystals.

Main Results:

  • Surface spontaneous parametric down-conversion is predicted as a direct consequence of field continuity requirements.
  • A generalized spectral amplitude formalism effectively describes this surface effect.
  • Surface contributions to SPDC were shown to be significant in analyzed nonlinear structures.

Conclusions:

  • Surface effects play a crucial role in spontaneous parametric down-conversion, particularly at interfaces of nonlinear materials.
  • The proposed theoretical framework provides a means to quantify surface contributions to SPDC.
  • This finding has implications for the design and understanding of nonlinear optical devices and quantum information technologies.