Abstract
Antenna structures that efficiently mediate propagating and localized electromagnetic fields can be exploited to spatially tailor electromagnetic fields with desired properties. This can be illustrated from two aspects in the optical regime as well as RF-photonic regime. On one hand, subwavelength antenna or antenna arrays can be used to generate optical fields with spatially tailored complex distribution that may be further utilized to produce non-diffractive or localized field. On the other front, carefully designed subwavelength antennas can directly convert propagating RF fields into strongly enhanced local electromagnetic fields at specific spatial location that can be further applied to efficiently modulate guided optical fields, enabling highly sensitive RF field detection and imaging.
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