Measurement of the enhanced evanescent fields of integrated waveguides for optical near-field sensing

Abstract

The sensitivity of an integrated optical sensing device can be enhanced by coating it with a high refractive index layer, while both incoupled intensity and spatial resolution are maintained. The potential for enhanced sensing is demonstrated using titanium indiffused waveguiding structures in ${\mathrm{LiNbO}}_3$ coated with a ${\mathrm{TiO}}_2$ film. To the best of our knowledge, it could be measured for the first time that the outcoupled intensity at the surface was enhanced by a factor of 12–15 while keeping the penetration depth of the evanescent field constant of the order of only a few tens of nanometers. The evanescent fields of the guided modes were measured and characterized with a scanning near-field optical microscope and are in accordance with the numerical simulations.

© 2008 Optical Society of America

Integrated optical microcavities for enhanced evanescent-wave spectroscopy

E. Krioukov, D. J. W. Klunder, A. Driessen, J. Greve, and C. Otto
Opt. Lett. 27(17) 1504-1506 (2002)

Optimization of a waveguide-mode sensing chip for an ultraviolet near-field illumination biosensor

Chiaki Kuroda, Yoshimichi Ohki, and Makoto Fujimaki
Opt. Express 25(21) 26011-26019 (2017)

Manipulating and controlling the evanescent field within optical waveguides using high index nanolayers [Invited]

John Canning, Whayne Padden, Danijel Boskovic, Masood Naqshbandi, Hank de Bruyn, and Maxwell J. Crossley
Opt. Mater. Express 1(2) 192-200 (2011)

Near-field imaging of the interference pattern of counterpropagating evanescent waves

Sergey I. Bozhevolnyi and Elena A. Bozhevolnaya
Opt. Lett. 24(11) 747-749 (1999)

Fabrication and characterization of a silicon cantilever probe with an integrated quartz-glass (fused-silica) tip for scanning near-field optical microscopy

Gregor Schürmann, Wilfried Noell, Urs Staufer, Nico F. de Rooij, Rolf Eckert, Jan M. Freyland, and Harry Heinzelmann
Appl. Opt. 40(28) 5040-5045 (2001)