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Robust detection of deeply subwavelength pits in simulated optical data-storage disks using photonic jets

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5 Author(s)
Kong, Soon-Cheol ; Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, USA ; Sahakian, A.V. ; Heifetz, A. ; Taflove, Allen
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We report a means to detect deeply subwavelength pits in optical data-storage media by employing the recently observed giant backscattering perturbation phenomenon of the photonic jet. We conducted microwave experiments with dimensionally scaled-up pits and lands in a simulated optical data-storage device. These measurements were backed up by three-dimensional finite-difference time-domain computational solutions of Maxwell's equations. Results indicate that pits having a lateral area of 0.025 square wavelengths, i.e., much smaller than current BluRay™ device features, can be robustly detected with a contrast ratio approximately 28 dB greater than that provided by a lens system.

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Applied Physics Letters  (Volume:92 ,  Issue: 21 )