A laser line-scanning instrument was developed to optimize the near-field enhancement capability of a onedimensional photonic crystal (PC) for excitation of surface-bound fluorophores. The excitation laser beam is shaped into an 8 μm × 1 mm line that is focused along the direction of the PC grating, while remaining collimated perpendicular to the grating. Such a beam configuration offers high excitation power density while simultaneously providing high resonant coupling efficiency from the laser to the PC surface. Using a panel of 21 immunofluorescence assays on the PC surface in a microarray format, the approach achieves an enhancement factor as high as 90-fold between on-resonance and off-resonance illumination. The instrument provides a capability for sensitive and inexpensive analysis of cancer biomarkers in clinical applications.

Original languageEnglish (US)
Pages (from-to)2565-2567
Number of pages3
JournalOptics Letters
Issue number13
StatePublished - Jul 1 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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