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Related Experiment Video

Updated: Jun 9, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

Directional Coupling to a λ/5000 Nanowaveguide.

Alessandro Tuniz^1,2, Sabrina Garattoni^2,3, Han-Hao Cheng⁴

¹Commonwealth Scientific and Industrial Research Organisation (CSIRO), Lindfield, NSW 2070, Australia.

|October 21, 2024

Summary

This summary is machine-generated.

Researchers developed a method to couple millimeter waves to nanoscale waveguides, overcoming diffraction limits for terahertz technologies. This breakthrough enables practical nanoscale terahertz applications and devices.

Keywords:

nanophotonics near-field imaging plasmonics terahertz photonics terahertz time domain spectroscopy

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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor

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Published on: August 30, 2012

Area of Science:

Terahertz (THz) technology
Nanophotonics
Plasmonics

Background:

Silicon microdevices offer practical THz technologies due to low loss and fabrication ease.
Diffraction limits conventional devices to hundreds of micrometers, hindering nanoscale THz applications.
Efficiently coupling to nanoscale metallic gap modes for THz confinement is challenging.

Purpose of the Study:

To demonstrate an efficient strategy for interfacing subterahertz radiation with nanoscale waveguides.
To overcome diffraction limitations for nanoscale terahertz applications.
To enable tailored and controllable interfacing of millimeter waves with nanoscale waveguides.

Main Methods:

Fabrication of a 200 nm wide nanogap waveguide in a gold film.
Utilizing phase matching between dielectric and nanogap waveguide modes for directional coupling.
Conducting broadband far-field terahertz transmission and near-field measurements.

Main Results:

Demonstrated efficient coupling of subterahertz radiation (1 mm wavelength) to a 200 nm nanogap waveguide.
Observed a transmission dip due to resonant coupling, indicating power transfer to the nanogap.
Achieved an estimated coupling efficiency of approximately 10% from dielectric to nanogap waveguide.

Conclusions:

Presented a novel method for interfacing millimeter waves with nanoscale waveguides.
The approach overcomes diffraction limits, enabling nanoscale terahertz device footprints.
Potential applications include on-chip nanospectroscopy, telecommunications, and quantum technologies.