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Evanescently coupled interface states in the gap between two Bragg reflectors.

Stuart Brand¹, Richard A Abram, Mikhail A Kaliteevski

¹Department of Physics, Durham University, South Road, Durham DH1 3LE, UK. stuart.brand@durham.ac.uk

|June 16, 2010

Summary

Researchers created a novel photonic structure using two prisms and Bragg reflectors. This system exhibits tunable transmission lines, mimicking dual-cavity properties for terahertz applications.

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Area of Science:

Optics and Photonics
Condensed Matter Physics

Background:

Bragg reflectors support interface states at their surfaces.
Evanescent coupling is a key phenomenon in photonic systems.

Purpose of the Study:

To investigate the interaction of interface states in a dual-prism system.
To explore the potential of this structure as an adjustable terahertz emitter.

Main Methods:

Utilizing Bragg reflectors on prism surfaces separated by a narrow gap.
Analyzing the spectral properties arising from evanescent coupling of interface states.

Main Results:

Observed the formation of a pair of very narrow transmission lines.
Demonstrated that the separation of these transmission lines is tunable by adjusting the gap size.
Showcased spectral properties analogous to a dual-cavity photonic microstructure despite a single cavity.

Conclusions:

The proposed dual-prism structure effectively mimics dual-cavity photonic systems.
This tunable transmission line system holds promise for adjustable beat-frequency emitters in the terahertz regime.