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Improvement in Resolution of Laser Capture Microdissection Using Near-Field Probe to Capture Nanoparticles

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3 Author(s)
Chien-Ming Chen ; Dept. of Electro-Opt. Eng., Nat. Taipei Univ. of Technol., Taipei, Taiwan ; Jen-Ai Lee ; Chi-Fu Yen

Purpose: A modified laser capture micro-dissection (LCM) system is developed to improve resolution to 400 nm, using a laser light (808 nm) transmitted by a near-field tip probe. Materials and methods: Using a 150-nm aperture to heat an ethylene vinyl acetate (EVA) film, melted spots on the average of 400 nm in diameter are generated on the underlying target composed of a 20-nm gold-particle monolayer. The near-field tip probe composed of fiber is set on a 2-D nanometer piezoactuator (PZT) for precise capturing of the monolayer of gold particles. The monolayer of gold particles under the target is bound to the EVA film using a laser, while the remaining EVA film stays on the monolayer. Results: The diameter of the melted spots as small as 400 nm are produced and details are provided that demonstrate the feasibility of the nano-operation of this new LCM system. Conclusion: The new LCM system successfully captures nanoparticles and improves resolution of micro-dissection to 400 nm. With this LCM system, the isolation of a single organelle or bacterium is possible.

Published in:

NanoBioscience, IEEE Transactions on  (Volume:8 ,  Issue: 2 )