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Nanoscale Waveguide Beam Splitter in Quantum Technologies.

Dmitry Makarov¹, Ksenia Makarova¹, Yuliana Tsykareva¹

¹Department of Fundamental and Applied Physics, Northern (Arctic) Federal University, nab. Severnoi Dviny 17, 163002 Arkhangelsk, Russia.

Nanomaterials (Basel, Switzerland)

|November 26, 2022

Summary

The theory for nanoscale waveguide beam splitters differs significantly from larger devices. This research presents a new theory crucial for advancing quantum technologies that utilize these tiny optical components.

Keywords:

beam splitter nanosize non-monochromatic photons photons reflection coefficient transmission coefficient wave function

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Published on: April 4, 2017

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Published on: November 21, 2019

Area of Science:

Quantum Optics
Nanophotonics

Background:

Waveguide beam splitters are key components in quantum optics.
Existing theories typically assume scale-invariance for these devices.

Purpose of the Study:

To investigate the distinct theoretical behavior of nanoscale waveguide beam splitters.
To present a generalized theory applicable to devices of varying scales.

Main Methods:

Analysis of the wave function at the output ports of nanoscale beam splitters.
Theoretical modeling considering device size, waveguide coupling, and photon nonmonochromaticity.

Main Results:

Demonstrated a significant theoretical divergence for nanoscale beam splitters compared to larger counterparts.
Showcased that prior theories represent a specific instance of the new, generalized framework.
Identified key parameters influencing output wave functions: beam splitter size, coupling, and photon spectral properties.

Conclusions:

The theory of nanoscale waveguide beam splitters is not universally equivalent to macroscopic devices.
The developed theory provides a more accurate description for quantum technologies relying on miniaturized beam splitters.
Results highlight the importance of scale and nonmonochromaticity in nanoscale quantum optical devices.