Near-field nanoimaging by nanoscale photodetector array

Boyang Liu*, Ki Young Kim, Yicheng Lai, Xiangyu Li, Fang Ou, Seng Tiong Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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 150 nm for 1.55 μm light. Additionally, we demonstrate the realization and characterization of the NPD array. The smallest NPD array obtained has 100-nm-wide pixels with 100 nm spacing. A responsivity of 0.28 A/W at 1.31 μm and 3.3 V bias is registered for a 2 X 2 NPD array pixel. The corresponding photocurrent is 735 nA with a dark current of 0.483 nA. Using near-field photocurrent microscopy, an imaging resolution of 390 nm has been demonstrated.

Original languageEnglish (US)
Pages (from-to)3367-3369
Number of pages3
JournalOptics Letters
Issue number21
StatePublished - Nov 1 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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