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, Steven G. Johnson

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2225-2241
Number of pages17
JournalOptics Express
Volume19
Issue number3
DOIs
Publication statusPublished - 2011 Jan 31
Externally publishedYes

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membranes
membrane structures
stress tensors
geometry
asymmetry
photonics
waveguides
modulation
fabrication
radiation
pulses
crystals
simulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Rodriguez, A. W., Mccauley, A. P., Hui, P. C., Woolf, D., Iwase, E., Capasso, F., ... Johnson, S. G. (2011). Bonding, antibonding and tunable optical forces in asymmetric membranes. Optics Express, 19(3), 2225-2241. https://doi.org/10.1364/OE.19.002225

Bonding, antibonding and tunable optical forces in asymmetric membranes. / Rodriguez, Alejandro W.; Mccauley, Alexander P.; Hui, Pui Chuen; Woolf, David; Iwase, Eiji; Capasso, Federico; Loncar, Marko; Johnson, Steven G.

In: Optics Express, Vol. 19, No. 3, 31.01.2011, p. 2225-2241.

Research output: Contribution to journalArticle

Rodriguez, AW, Mccauley, AP, Hui, PC, Woolf, D, Iwase, E, Capasso, F, Loncar, M & Johnson, SG 2011, 'Bonding, antibonding and tunable optical forces in asymmetric membranes', Optics Express, vol. 19, no. 3, pp. 2225-2241. https://doi.org/10.1364/OE.19.002225
Rodriguez AW, Mccauley AP, Hui PC, Woolf D, Iwase E, Capasso F et al. Bonding, antibonding and tunable optical forces in asymmetric membranes. Optics Express. 2011 Jan 31;19(3):2225-2241. https://doi.org/10.1364/OE.19.002225
Rodriguez, Alejandro W. ; Mccauley, Alexander P. ; Hui, Pui Chuen ; Woolf, David ; Iwase, Eiji ; Capasso, Federico ; Loncar, Marko ; Johnson, Steven G. / Bonding, antibonding and tunable optical forces in asymmetric membranes. In: Optics Express. 2011 ; Vol. 19, No. 3. pp. 2225-2241.
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