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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 3 — Jan. 31, 2011
  • pp: 2225–2241

Bonding, antibonding and tunable optical forces in asymmetric membranes

Alejandro W. Rodriguez, Alexander P. McCauley, Pui-Chuen Hui, David Woolf, Eiji Iwase, Federico Capasso, Marko Loncar, and Steven G. Johnson  »View Author Affiliations

Optics Express, Vol. 19, Issue 3, pp. 2225-2241 (2011)

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We demonstrate that tunable attractive (bonding) and repulsive (anti-bonding) forces can arise in highly asymmetric structures coupled to external radiation, a consequence of the bonding/anti-bonding level repulsion of guided-wave resonances that was first predicted in symmetric systems. Our focus is a geometry consisting of a photonic-crystal (holey) membrane suspended above an unpatterned layered substrate, supporting planar waveguide modes that can couple via the periodic modulation of the holey membrane. Asymmetric geometries have a clear advantage in ease of fabrication and experimental characterization compared to symmetric double-membrane structures. We show that the asymmetry can also lead to unusual behavior in the force magnitudes of a bonding/antibonding pair as the membrane separation changes, including nonmonotonic dependences on the separation. We propose a computational method that obtains the entire force spectrum via a single time-domain simulation, by Fourier-transforming the response to a short pulse and thereby obtaining the frequency-dependent stress tensor. We point out that by operating with two, instead of a single frequency, these evanescent forces can be exploited to tune the spring constant of the membrane without changing its equilibrium separation.

© 2011 Optical Society of America

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(230.4320) Optical devices : Nonlinear optical devices

ToC Category:
Nonlinear Optics

Original Manuscript: November 19, 2010
Revised Manuscript: January 14, 2011
Manuscript Accepted: January 16, 2011
Published: January 21, 2011

Alejandro W. Rodriguez, Alexander P. McCauley, Pui-Chuen Hui, David Woolf, Eiji Iwase, Federico Capasso, Marko Loncar, and Steven G. Johnson, "Bonding, antibonding and tunable optical forces in asymmetric membranes," Opt. Express 19, 2225-2241 (2011)

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