Abstract

We report a demonstration of near-field nanoimaging using nanoscale photodetector (NPD) array. The NPD array has detector pixels with subwavelength dimension and is capable of pixel addressing. An active-media finite-difference time-domain simulation of the NPD array shows an imaging resolution of 150nm for 1.55μm light. Additionally, we demonstrate the realization and characterization of the NPD array. The smallest NPD array obtained has 100-nm-wide pixels with 100nm spacing. A responsivity of 0.28AW at 1.31μm and 3.3V bias is registered for a 2×2 NPD array pixel. The corresponding photocurrent is 735nA with a dark current of 0.483nA. Using near-field photocurrent microscopy, an imaging resolution of 390nm has been demonstrated.

© 2009 Optical Society of America

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