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$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

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Related Experiment Video

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Writing Bragg Gratings in Multicore Fibers

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Published on: April 20, 2016

Phase-shifted Bragg gratings for Bloch surface waves.

Leonid L Doskolovich, Evgeni A Bezus, Dmitry A Bykov

|October 20, 2015

Summary

Researchers propose a novel phase-shifted Bragg grating (PSBG) analogue for Bloch surface waves (BSW). This innovation enables temporal differentiation of picosecond BSW pulses for all-optical analog computing.

Area of Science:

Photonics
Condensed Matter Physics
Nanotechnology

Background:

Bloch surface waves (BSW) are electromagnetic waves confined to the interface of a photonic crystal.
Phase-shifted Bragg gratings (PSBG) are used for manipulating wave propagation.
All-optical analog computing requires efficient methods for signal processing at the nanoscale.

Purpose of the Study:

To propose and investigate a novel analogue of PSBG for BSW.
To demonstrate the potential of this analogue for temporal differentiation of BSW pulses.
To explore applications in on-chip all-optical analog computing.

Main Methods:

Design of a 1D photonic crystal with dielectric ridges.
Encoding effective refractive index distribution via ridge height.

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Rigorous simulation of surface wave diffraction.

Comparison with conventional PSBG plane wave diffraction.

Main Results:

The proposed structure acts as a PSBG analogue for BSW.
Demonstrated capability for temporal differentiation of picosecond BSW pulses.
Simulation results show good agreement with theoretical predictions.

Conclusions:

The proposed dielectric ridge structure effectively mimics PSBG for BSW.
This BSW-PSBG analogue is suitable for temporal differentiation of ultrashort pulses.
The findings pave the way for advanced on-chip all-optical analog computing systems.