- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Handbook of Graphene || Hybrid Graphene–Silicon Photonic and Optoelectronic Integrated Devices
摘要： Graphene, a monolayer of carbon atoms arranged in a honeycomb pattern, has many intriguing optical and electrical properties, providing us numerous applications in optoelectronics, nonlinear optics, and biochemical sensing. However, due to the atomic thickness of the material, light–matter interactions in graphene are intrinsically weak, which greatly limit its practical applications. To overcome this challenge, graphene-on-silicon photonic integrated circuits (PICs) have been proposed and demonstrated in recent years. In such PICs, the propagating light in silicon waveguides can strongly interact with the top-layer graphene through in-plane evanescent–field coupling. On the other hand, with unique properties in photonics and optoelectronics, graphene is expected to open a new avenue for the development of revolutionized on-chip applications, which cannot be precedent based on traditional silicon photonic technology. Therefore, this emerging area has attracted a great deal of attention. In this Chapter, we comprehensively introduce theoretical principles, fabrication processes, and applications of graphene-on-silicon PICs, and review recent research progress in this topic.
关键词： silicon photonics,optoelectronics,photonic integrated circuits,optical interconnects,biochemical sensing,Graphene,mid-infrared photonics,nonlinear optics
更新于2025-09-11 14:15:04
-
Mesoporous titania-coated biosensor and FEM model design for highly sensitive detection of low molecular weight targets
摘要： This paper presents the interest of a highly sensitive biosensor coated with a TiO2 mesoporous film as sensitive layer. The main novelty is related to the modelling of the device and simulation by using Finite Element Method with COMSOL Multiphysics software, as a good way to take into account the physical properties of porous 3D-layers. The strategy of using such Love wave devices, with 3D porous layers, offering further easy functionalization, aims not only to increase the amount of targets caught on the sensor surface, but also to enhance the detection mechanism by a higher perturbation of the Love wave acoustic energy which could be trapped inside the 3D sensitive layer. First, as a proof of concept, experimental devices with a 3D titania mesoporous layer were realized, and they have shown a good agreement with simulated results. Furthermore, experimental test with several Newtonian liquids are investigated, in a range of viscosities from 1 to 7 cP, typical of those concerned by our biochemical applications. The sensitivity with a 300 nm thick porous sensing layer was 10 times that of the bare device, with interesting dynamical issues to be further studied, giving rise to the great potentialities of such architectures for biological detection of low weight biochemical targets.
关键词： surface to volume ratio,mesoporous materials,biochemical sensing,Radio Frequency Love wave device,finite element modelling,acoustic interaction in liquid medium
更新于2025-09-10 09:29:36