Banxian Ruan

Tunable optical forces exerted on a black phosphorus coated dielectric particle by a Gaussian beam

In this paper, we systematically investigate the optical forces exerted on a black phosphorus (BP) coated dielectric particle by a Gaussian beam. The optical forces of the BP coated particle could be modified effectively by tuning the characteristics of the BP layer, such as the carrier density, BP thickness, and the angular dependence of anisotropic conductivity. The resonant mechanism and whispering gallery mode of the BP coated particle are analyzed. Furthermore, the multi-polar surface plasmons of the BP coated dielectric particle excited by the Laguerre Gaussian beam in the infrared band are also investigated. These investigations provide rich potential applications in flexible optical manipulation and optoelectronic devices.

High Sensitivity Intensity-Interrogated Bloch Surface Wave Biosensor With Graphene

Bloch surface wave (BSW) is a surface state excited within the truncate defect layer at the surface of a dielectric 1-D photonic crystal (1DPC), which has been suggested as an attractive alternative to surface plasmon resonance (SPR) in chemical and biological sensors. In this paper, we propose an intensity-sensitive BSW sensor based on the truncate 1DPC with graphene. By optimizing the thickness of the defect layer and the layer number of graphene, the maximum intensity sensitivity of biosensor can surpass

Ultrasensitive Terahertz Biosensors Based on Fano Resonance of a Graphene/Waveguide Hybrid Structure

3.5times 10^{4}

Improving the Performance of an SPR Biosensor Using Long-Range Surface Plasmon of Ga-Doped Zinc Oxide

/RIU, which is greater than that for the conventional BSW or SPR sensors. With such excellent and interesting performance, we believe that the structure can be useful for many important applications in the field of chemical and biological sensors in the future.

High-Performance Lossy-Mode Resonance Sensor Based on Few-Layer Black Phosphorus

Graphene terahertz (THz) surface plasmons provide hope for developing functional devices in the THz frequency. By coupling graphene surface plasmon polaritons (SPPs) and a planar waveguide (PWG) mode, Fano resonances are demonstrated to realize an ultrasensitive terahertz biosensor. By analyzing the dispersion relation of graphene SPPs and PWG, the tunable Fano resonances in the terahertz frequency are discussed. It is found that the asymmetric lineshape of Fano resonances can be manipulated by changing the Fermi level of graphene, and the influence of the thickness of coupling layer and air layer in sandwich structure on the Fano resonances is also discussed in detail. We then apply the proposed Fano resonance to realize the ultrasensitive terahertz biosensors, it is shown that the highest sensitivities of 3260 RIU−1 are realized. Our result is two orders of a conventional surface plasmon resonance sensor. Furthermore, we find that when sensing medium is in the vicinity of water in THz, the sensitivity increases with increasing refractive index of the sensing medium.

Terahertz imaging sensor based on the strong coupling of surface plasmon polaritons between PVDF and graphene

Transparent conducting oxides (TCOs) have appeared in the past few years as potential plasmonic materials for the development of optical devices in the near infrared regime (NIR). However, the performance of biosensors with TCOs has been limited in sensitivity and figure of merit (FOM). To improve the performance of the biosensors with TCOs, a biosensor based on long-range surface plasmon with Ga-doped zinc oxide (GZO) is proposed. It is shown that a larger FOM with a 2~7 times enhancement compared to the traditional surface plasmon polaritons (SPPs) sensor and higher detection accuracy (DA) can be realized in our proposed sensor compared with the surface plasmon resonance (SPR) sensor with GZO. Therefore, this sensor can be used to detect biological activity or chemical reactions in the near infrared region.