Single-Mode Control and Individual Nanoparticle Detection in the Ultraviolet Region Based on Boron Nitride Microdisk with Whispering Gallery Mode
Jiaxing Li,
Qiang Li,
Ransheng Chen,
Qifan Zhang,
Wannian Fang,
Kangkang Liu,
Feng Li,
Feng Yun
Affiliations
Jiaxing Li
Key Laboratory of Physical Electronics and Devices for Ministry of Education and Shaanxi Provincial Key Laboratory of Photonics & Information Technology, Xi’an Jiaotong University, Xi’an 710049, China
Qiang Li
Key Laboratory of Physical Electronics and Devices for Ministry of Education and Shaanxi Provincial Key Laboratory of Photonics & Information Technology, Xi’an Jiaotong University, Xi’an 710049, China
Ransheng Chen
School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Qifan Zhang
School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Wannian Fang
School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Kangkang Liu
School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Feng Li
Key Laboratory of Physical Electronics and Devices for Ministry of Education and Shaanxi Provincial Key Laboratory of Photonics & Information Technology, Xi’an Jiaotong University, Xi’an 710049, China
Feng Yun
School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Optical microcavities are known for their strongly enhanced light–matter interactions. Whispering gallery mode (WGM) microresonators have important applications in nonlinear optics, single-mode output, and biosensing. However, there are few studies on resonance modes in the ultraviolet spectrum because most materials with high absorption properties are in the ultraviolet band. In this study, the performance of a microdisk cavity based on boron nitride (BN) was simulated by using the Finite-difference time-domain (FDTD) method. The WGM characteristics of a single BN microdisk with different sizes were obtained, wherein the resonance modes could be regulated from 270 nm to 350 nm; additionally, a single-mode at 301.5 nm is achieved by cascading multiple BN microdisk cavities. Moreover, we found that a BN microdisk with a diameter of 2 μm has a position-independent precise sensitivity for the nanoparticle of 140 nm. This study provides new ideas for optical microcavities to achieve single-mode management and novel coronavirus size screening, such as SARS-CoV-2, in the ultraviolet region.
