Bonding, antibonding and tunable optical forces in asymmetric membranes
Name
Johnson_Bonding antibonding.pdf
Size
1.38 MB
Format
Adobe PDF
Checksum (MD5)
3025c83e9e41e064c800ee8ac78db5b6
Author(s)
Hui, Pui-Chuen
Woolf, David
Iwase, Eiji
Capasso, Federico
Loncar, Marko
Rodriguez-Wong, Alejandro
McCauley, Alexander Patrick
Johnson, Steven G.
Date Issued
January 2011
Journal
Optics Express
Publisher
Optical Society of America
Citation
Rodriguez, Alejandro W. et al. “Bonding, Antibonding and Tunable Optical Forces in Asymmetric Membranes.” Optics Express 19.3 (2011): 2225. Web. 26 June 2012. © 2011 Optical Society of America
Version
Final published version
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.
MIT Department
Massachusetts Institute of Technology. Department of Mathematics
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1364/OE.19.002225
