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Scientific reports v.6, 2016년, pp.37134 -    SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Ultraviolet optomechanical crystal cavities with ultrasmall modal mass and high optomechanical coupling rate

Zhou, Wen (Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong ) ; Yu, Zejie (Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong ) ; Ma, Jingwen (Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong ) ; Zhu, Bingqing (Shun Hing Institute of Advanced Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong ) ; Tsang, Hon Ki (Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong ) ; Sun, Xiankai (Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong ) ;
  • 초록  

    Optomechanical crystal (OMC) cavities which exploit the simultaneous photonic and phononic bandgaps in periodic nanostructures have been utilized to colocalize, couple, and transduce optical and mechanical resonances for nonlinear interactions and precision measurements. The development of near-infrared OMC cavities has difficulty in maintaining a high optomechanical coupling rate when scaling to smaller mechanical modal mass because of the reduction of the spatial overlap between the optical and mechanical modes. Here, we explore OMC nanobeam cavities in gallium nitride operating at the ultraviolet wavelengths to overcome this problem. With a novel optimization strategy, we have successfully designed an OMC cavity, with a size of 3.83 × 0.17 × 0.13 μm 3 and the mechanical modal mass of 22.83 fg, which possesses an optical mode resonating at the wavelength of 393.03 nm and the fundamental mechanical mode vibrating at 14.97 GHz. The radiation-limited optical Q factor, mechanical Q factor, and optomechanical coupling rate are 2.26 × 10 7 , 1.30 × 10 4 , and 1.26 MHz, respectively. Our design and optimization approach can also serve as the general guidelines for future development of OMC cavities with improved device performance.


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