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Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials

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Dielectric-loaded plasmonic waveguide-ring resonators.

Tobias Holmgaard¹, Zhuo Chen, Sergey I Bozhevolnyi

¹Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, DK-9220, Aalborg Øst, Denmark. holmgaard@nano.aau.dk

|February 17, 2009

Summary

This summary is machine-generated.

This study demonstrates compact and efficient dielectric-loaded plasmonic waveguide-ring resonator filters using UV-lithography. Near-field microscopy confirms good agreement between measured and calculated wavelength responses for telecom applications.

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Area of Science:

Photonics
Nanotechnology
Optical Engineering

Background:

Plasmonic waveguide-ring resonators (WRRs) are crucial for integrated photonic circuits.
Optimizing WRR performance requires precise control over device fabrication and coupling.
Telecom wavelength operation necessitates specific material and design considerations.

Purpose of the Study:

To investigate the performance of dielectric-loaded plasmonic WRRs at telecom wavelengths.
To evaluate the impact of waveguide-ring separations on WRR characteristics.
To demonstrate the feasibility of fabricating compact and efficient WRR-based filters.

Main Methods:

Near-field microscopy was employed to characterize WRR performance.
Various waveguide-ring separations were systematically studied.
UV-lithography was used for device fabrication.
The effective-index method was utilized for theoretical calculations.

Main Results:

Compact WRR-based filters with a footprint of approximately 150 microm(2) were realized.
High extinction ratios of approximately 13 dB were achieved, indicating efficient filtering.
Measured WRR wavelength responses showed good agreement with effective-index method calculations.

Conclusions:

UV-lithography enables the fabrication of compact and efficient dielectric-loaded plasmonic WRR filters.
The demonstrated WRRs are suitable for telecom wavelength applications.
Near-field microscopy is a valuable tool for characterizing plasmonic devices.