Broadband optical resonator based on coupled positive- and negative-index waveguides

Max Bethune-Waddell; Kenneth J. Chau

doi:10.1117/12.906930

21 February 2012 Broadband optical resonator based on coupled positive- and negative-index waveguides

Max Bethune-Waddell, Kenneth J. Chau

Proceedings Volume 8269, Photonic and Phononic Properties of Engineered Nanostructures II; 82690A (2012) https://doi.org/10.1117/12.906930
Event: SPIE OPTO, 2012, San Francisco, California, United States

Abstract

We propose and design a broadband optical resonator fashioned from two types of waveguides: one sustaining a positive-index mode with a positive phase velocity and another sustaining a negative-index mode with a negative phase velocity. The former has a wavelength that decreases as a function of frequency, while the latter has a wavelength that increases as a function of frequency. Because frequency-dependent wavelength increases in one waveguide component of the resonator are compensated by wavelength decreases in the other component, the resonator can potentially support a continuum of standing wave patterns that all satisfy the same resonance condition, effectively widening the frequency range over which resonance is achievable. We have tailored the geometry of the resonator so that the net phase accrued within the resonator is nearly constant over a large portion of the visible frequency range, and, as shown through FDTD simulations and analytical calculations, a broadband optical resonance is achieved.

Citation Download Citation

Max Bethune-Waddell and Kenneth J. Chau "Broadband optical resonator based on coupled positive- and negative-index waveguides", Proc. SPIE 8269, Photonic and Phononic Properties of Engineered Nanostructures II, 82690A (21 February 2012); https://doi.org/10.1117/12.906930

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