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This paper discusses the usage of the photonic nanojet to detect deeply subwavelength pits in a metal substrate for the purpose of high-density optical data storage. Three-dimensional Finite-Difference Time-Domain (FDTD) computational solutions of Maxwell's equations are used to analyze and design the system. The paper finds that nanojet-illuminated pits having lateral dimensions of only 100 150nm2 yield a 40-dB contrast ratio. The FDTD simulation results show that pit-depth modulation and pit-width modulation can significantly increase the optical data-storage capacity.
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