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13 March 2013 A tunable split-ladder photonic crystal cavity by nanoelectromechanical actuator
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In this paper, we demonstrate a novel split-ladder photonic crystal cavity, which can be tuned across a very large wavelength range by an on-chip integrated nano-electromechanical actuator. The nano-electromechanical actuator is used to control the cavity’s central gap. When the cavity gap is widened, the resonance wavelength is blue-shifted correspondingly. The dimensions of the proposed split-ladder cavity are designed by 3D Finite-difference time-domain (FDTD) calculations. We fabricated and tested the devices. Experimental results show that the optomechanical coupling coefficient of the second order resonance mode is about 80 GHz/nm. In addition, there is a relatively linear relationship between the resonance shift and the gap change. The maximum measured resonance wavelength shift is about 17 nm, corresponding to a cavity central gap increase of 26 nm.
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Feng Tian, Guangya Zhou, Fook Siong Chau, Jie Deng, Ramam Akkipeddi, Xiaosong Tang, Siew Lang Teo, and Yee Cheong Loke "A tunable split-ladder photonic crystal cavity by nanoelectromechanical actuator", Proc. SPIE 8616, MOEMS and Miniaturized Systems XII, 86160Q (13 March 2013);

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