Abstract
A Bloch surface wave (BSW) lens is the low-loss counterpart of a plasmonic lens, designed to convert far-field light into a subwavelength near-field optical spot, and vice versa. Propagation of a BSW is greatly extended in the absence of a metal's intrinsic loss; therefore, analysis of a BSW passing through multiple-ring slots is critical for efficient design. The authors find that reflectance loss of the ring slot is nontrivial for a multiring BSW lens, and they present an optimized design that balances increasing ring number with reflective loss. This work could find use in near-field imaging, sensing, lighting, integrated photonic circuits, and optical trapping.
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