Tunable bipolar optical interactions between guided lightwaves

Mo Li, W. H P Pernice, H. X. Tang

Research output: Contribution to journalArticlepeer-review

212 Scopus citations


State-of-the-art advances in nanoscale optomechanics allow light to be guided in free-standing waveguides or resonators. In closely spaced devices, the coupling between the guided lightwaves gives rise to an optical force known as the optical bonding force. Indeed, attractive optical force has been observed in substrate coupled devices. According to recent theoretical predictions, the optical force should show bipolar behaviour depending on the relative phase between in-plane coupled lightwaves. So far, such an in-plane optical force has not been measured. Here, we experimentally demonstrate a bipolar optical force between planarly coupled nanophotonic waveguides. Both attractive and repulsive optical forces are obtained. The sign of the force can be switched reversibly by tuning the relative phase of the interacting lightwaves. This highly engineerable force of bipolar nature could be used as the operation principle for a new class of planar light force devices and circuits on a CMOS-compatible platform.

Original languageEnglish (US)
Pages (from-to)464-468
Number of pages5
JournalNature Photonics
Issue number8
StatePublished - Aug 2009

Bibliographical note

Funding Information:
We acknowledge a seedling grant from DARPA/MTO. H.X.T. acknowledges support from a CAREER award from the National Science Foundation (NSF). W.H.P.P. acknowledges support from the Alexander von Humboldt postdoctoral fellowship program. Part of the funding was provided by a seed grant offered by Yale Institute for Nanoscience and Quantum Information. The devices were fabricated at Yale University Center for Microelectronic Materials and Structures and the NSF-sponsored Cornell Nanoscale Facility.

Copyright 2013 Elsevier B.V., All rights reserved.

Fingerprint Dive into the research topics of 'Tunable bipolar optical interactions between guided lightwaves'. Together they form a unique fingerprint.

Cite this