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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 25 — Dec. 3, 2012
  • pp: 27697–27707

Tuning of split-ladder cavity by its intrinsic nano-deformation

Feng Tian, Guangya Zhou, Fook Siong Chau, Jie Deng, Yu Du, Xiaosong Tang, Ramam Akkipeddi, and Yee Chong Loke  »View Author Affiliations

Optics Express, Vol. 20, Issue 25, pp. 27697-27707 (2012)

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A wide-range split-ladder photonic crystal cavity which is tuned by changing its intrinsic gap width is designed and experimentally verified. Different from the coupled cavities that feature resonance splitting into symmetric and anti-symmetric modes, the single split-ladder cavity has only the symmetric modes of fundamental resonance and second-order resonance in its band gap. Finite-difference time-domain simulations demonstrate that bipolar resonance tuning (red shift and blue shift respectively) can be achieved by shrinking and expanding the cavity’s gap, and that there is a linear relationship between the resonance shifts and changes in gap width. Simulations also show that the split-ladder cavity can possess a high Q-factor when the total number of air holes in the cavity is increased. Experimentally, comb drive actuator is used to control the extent of the cavity’s gap and the variation of its displacements with applied voltage is calibrated with a scanning electron microscope. The measured wavelength of the second-order resonance shifts linearly towards blue with increase in gap width. The maximum blue shift is 17 nm, corresponding to a cavity gap increase of 26 nm with no obvious degradation of Q-factor.

© 2012 OSA

OCIS Codes
(140.3948) Lasers and laser optics : Microcavity devices
(350.4238) Other areas of optics : Nanophotonics and photonic crystals
(220.4241) Optical design and fabrication : Nanostructure fabrication
(230.4685) Optical devices : Optical microelectromechanical devices

ToC Category:
Photonic Crystals

Original Manuscript: August 17, 2012
Revised Manuscript: October 15, 2012
Manuscript Accepted: October 17, 2012
Published: November 29, 2012

Feng Tian, Guangya Zhou, Fook Siong Chau, Jie Deng, Yu Du, Xiaosong Tang, Ramam Akkipeddi, and Yee Chong Loke, "Tuning of split-ladder cavity by its intrinsic nano-deformation," Opt. Express 20, 27697-27707 (2012)

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