期刊
OPTICS LETTERS
卷 44, 期 14, 页码 3558-3561出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.44.003558
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- Office of Naval Research (ONR) [N00014-19-1-2011]
Evanescently coupled passive waveguides experience optical forces of attractive or repulsive nature, depending on the mode of operation. Here we explore the optical forces between parity-time-symmetric coupled waveguides, with balanced levels of gain and loss. We find that, besides the diagonal stress components that result in a pressure normal to the surface of the waveguides, this system exhibits an off-diagonal stress component that creates a shear along the propagation direction. In addition, for a critical value of balanced gain and loss, the normal pressure can be reduced to zero. These anomalous optical forces are related to the unusual power flow in coupled active-passive channels, and open interesting opportunities for microfluidics and micro-optomechanical systems. (C) 2019 Optical Society of America
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