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Open Access Nano Express

Identification of water content in nanocavities

Maysoun Douas12, Manuel I Marqués13* and Pedro A Serena2

Author Affiliations

1 Departamento de Física de Materiales C-04, Universidad Autónoma de Madrid, Madrid 28049, Spain

2 Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Madrid 28049, Spain

3 Instituto de Ciencia de Materiales ‘Nicolás Cabrera’, Universidad Autónoma de Madrid, Madrid 28049, Spain

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Nanoscale Research Letters 2013, 8:171  doi:10.1186/1556-276X-8-171

Published: 15 April 2013

Abstract

A tapered dielectric waveguide that scans, at constant height, a sample containing a viral capsid is studied by combining a lattice gas model to simulate water meniscus formation and a finite difference time domain algorithm for light propagation through the media involved. Our results show different contrasts related to different water contents and different meniscus orientations. We propose this method as a way to study water content and evaporation process in nanocavities being either biological, like viral capsides, or nonbiological, like photonic crystals.

Keywords:
SNOM; Viral capsid; Water; FDTD; Lattice gas