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Published April 25, 2002 | Published
Book Section - Chapter Open

Optimization of Q factor in optical nanocavities based on free-standing membranes


We express the quality factor of a mode in terms of the Fourier transforms of its field components, and prove that the reduction in radiation loss can be achieved by suppressing the mode's wave-vector components within the light cone. Although this is intuitively clear, our analytical proof gives us insight into how to achieve the Q factor optimization, without the mode delocalization. We focus on the dipole defect mode in free standing membrane and achieve Q > 10^4, while preserving the mode volume of the order of one half of cubic wavelength in material. The derived expressions and conclusions can be used in optimization of Q factor for any type of defect in planar photonic crystals.

Additional Information

© 2002 Society of Photo-Optical Instrumentation Engineers (SPIE). This work was supported by the Caltech MURI Center for Quantum Networks.

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