Youfu Geng

A fiber-optic biosensor based on self-reference parallel Fabry–Perot interference (FPI) is proposed for label-free DNA detection. The parallel FPI is formed by fusing a section of exposed core fiber (ECF) in SMF and MMF. Adopting the air cavity of the ECF as a reference, a self-reference differential phase demodulation technique is designed to improve the stability and resolution of the demodulation system.

Subwavelength grating structures are widely used in integrated optical devices due to their compact footprints and flexible refractive index tailoring. In this paper, we present a subwavelength grating (SWG) coupler for a 70-nm-thick silicon waveguide without the upper cladding. The device was designed by using a particle swarm optimization algorithm in 3D finite-difference time-domain simulation.

Open AccessArticle by 1, 2,*, 1,* and 3 1 College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China 2 Institute of Translational Medicine, The First Affiliated Hospital (Shenzhen Second People’s Hospital), Shenzhen University, Health Science Center, Shenzhen 518060, China 3 School of Science, Chinese University of Hong Kong, Shenzhen 518172, China * Authors to whom correspondence should be addressed.