摘要
A photonic crystal nanobeam cavity(M-PCNC)with a structure incorporating a mixture of diamond-shaped and circular air holes is pro-posed.The performance of the cavity is simulated and studied theoretically.Using thefinite-difference time-domain method,the parameters of the M-PCNC,including cavity thickness and width,lattice constant,and radii and numbers of holes,are optimized,with the quality factor Q and mode volume Vm as performance indicators.Mutual modulation of the lattice constant and hole radius enable the proposed M-PCNC to realize outstanding performance.The optimized cavity possesses a high quality factor Q 1.45105 and an ultra-small mode=×volume Vm 0.01(λ/n)[Zeng et al.,Opt Lett 2023:48;3981–3984]in the telecommunications wavelength range.Light can be progres-=sively squeezed in both the propagation direction and the perpendicular in-plane direction by a series of interlocked anti-slots and slots in the diamond-shaped hole structure.Thereby,the energy can be confined within a small mode volume to achieve an ultra-high Q/Vm ratio.
基金
supported by the Open Fund of the State Key Laboratory of Advanced Optical Communication Systems and Networks (SJTU)(Grant No. 2023GZKF018)
the Open Fund of IPOC (BUPT)(Grant No. IPOC2021B03)
the National Natural Science Foundation of China (NSFC)(Grant No. 11974188)
the China Postdoctoral Science Foundation (Grant Nos. 2021T140339 and 2018M632345)
the Jiangsu Province Postdoctoral Science Foundation (Grant No. 2021K617C)
the Postgraduate Research and Practice Innovation Program of Jiangsu Province (Grant No.KYCX22_0945)
the Qing Lan Project of Jiangsu Province
作者简介
Jingtong Bin is currently a postgraduate student at Xidian University.He obtained a Bachelor’s degree from Nanjing University of Posts and Telecommunications.His main research interests are in photonic crystal nanobeam cavities and artificial intelligence;Kerui Feng graduated from the College of Telecommunication and Information Engineering at Nanjing University of Posts and Telecommunications with a Bachelor’s degree in electronic information engineering.His main research interest is in photonic crystal devices;Shang Ma is currently a postgraduate student in the College of Telecommunication and Information Engineering at Nanjing University of Posts and Telecommunications.His main research interest is in nanobeam cavities;Ke Liu is currently a postgraduate student in the College of Telecommunication and Information Engineering at Nanjing University of Posts and Telecommunications.His main research interest is in photonic-crystal surface-emitting lasers;Authors to whom correspondence should be addressed:Yong Cheng received the Ph.D.degree in electromagnetic field and microwave technology from the Nanjing University of Posts and Telecommunications,Nanjing,China,in 2010.He is currently a Professor with the College of Electronic and Optical Engineering and the College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing.His research interests include RF and antenna technology in mobile communications,and new RF microwave circuits and devices.chengy@njupt.edu.cn;Jing Chen received the Ph.D.degree in physics from Nanjing University,Nanjing,China,in 2012.He is currently a Professor with the College of Electronic and Optical Engineering and the College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing.His research interests include metamaterials,metasurfaces,nanophotonics,and nonlinear optics;Authors to whom correspondence should be addressed:Qifa Liu is currently an Associate Professor in the College of Telecommunication and Information Engineering at Nanjing University of Posts and Telecommunications.He received a Ph.D.degree in microelectronics from Shanghai Jiaotong University in 2013.Between 2019 and 2020,Dr.Liu worked as a visiting scholar in Professor Weidong Zhou’s research center at the University of Texas at Arlington to develop micro/nanophotonic cavities.Dr.Liu is now focusing on the design and fabrication of micro/nanophotonic devices such as photonic crystal cavities,lasers,and III-V compound-based active devices.liuqf@njupt.edu.cn。
