Low-loss conical field local enhancement device with groove

Abstract

The invention reveals a low-loss conical field local enhancement device with a groove, and the local enhancement device comprises four structures: a first structure, a second structure, a third structure and a fourth structure, wherein the first, second, third and fourth structures sequentially form a coaxial conical structure from the inside to the outside. The coaxial conical structure comprisestwo parts: an upper half part with an annular groove on the surface, and a lower half part with the smooth surface. The height of the upper half part and the height of the lower half part are each the half of the height of the cone, and the position at the half of the height of the cone is provided with a periodic annular groove with the depth of d, the period of L and the duty ratio of 5: 12 inan upward manner along an external inclined surface of the fourth structure. The device is compact and simple in structure, and the structure is easy to design. The material is easy to obtain, and thepreparation is easy to implement. The device facilitates the integration of photons, so the device can be used for the super-resolution imaging, single molecule detection, optical data storage, micro-nano sensing detection and near field optics.

Description

technical field [0001] The invention relates to a low-loss conical field local enhancement device with grooves, which can be used in many technical fields such as super-resolution imaging, single-molecule detection, optical data storage, micro-nano sensing detection, and near-field optics. Background technique [0002] With the rapid development of nano-optics, the nano-optical devices have become the focus of many scholars' research. As the size and spatial distance of nano-optical devices are constantly shrinking, technical difficulties will be encountered when designing nanoscale with special shapes and sizes-the transfer and concentration of light fields on the nanoscale (nano-focusing). Because the wavelength of light is on the microscale, many orders of magnitude too large, which limits the development of nano-optical devices, for example: tapered optical fibers or focusing on metal tips will cause huge losses, only a very small part of the excitation energy is transfe...

AI Technical Summary

Problems solved by technology

Radially polarized light can effectively improve the excitation efficiency of SPPs and further localize and enhance through the metal tip, while linearly polarized light cannot well meet the excitation polarization requirements of SPPs

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