A Refractive Index Sensor Based on Metal-Dielectric-Metal Waveguide Bragg Grating
A technology of refractive index sensor and Bragg grating, applied in the field of integrated optics, can solve problems such as difficulty in miniaturization, and achieve the effects of adjustable working wavelength, easy preparation and small size
Active Publication Date: 2021-06-08
NANJING UNIV OF POSTS & TELECOMM +1
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Problems solved by technology
Therefore, it needs to precisely control the incident angle of its incident light, and it is difficult to realize miniaturization (Taylor A D, Ladd J, Yu Q, et al. Quantitative and simultaneous detection of four foodborne bacteria pathogens with a multi-channel SPR sensor.[J]. Biosensors & Bioelectronics, 2006, 22(5): 752-758.)
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[0020] Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of applying the technical solutions of the present invention, and all technical solutions formed by adopting equivalent replacements or equivalent transformations fall within the protection scope of the present invention.
[0021] The invention discloses a refractive index sensor based on a metal-dielectric-metal waveguide Bragg grating, such as figure 1 As shown, it includes a metal-medium-metal waveguide 1, a metal film 2 in the waveguide, and a Bragg grating structure. The metal-medium-metal waveguide is called MIM (Metal Insulator Metal) for short. The width of the waveguide is w, and the waveguide The medium inside is air, the Bragg grating structure is composed of unit A and unit B periodically arranged, the period number of the Bragg grating is N, and the width a...
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Abstract
The present invention discloses a refractive index sensor based on a metal-dielectric-metal waveguide Bragg grating, which includes a metal-dielectric-metal waveguide, a metal film in the waveguide and a Bragg grating structure, and the width of the waveguide is w , the medium in the waveguide is air, the Bragg grating structure is formed by periodic arrangement of unit A and unit B, and the period number of the Bragg grating is N , the width and length of the unit A are respectively w A and d A , the width and length of unit B are respectively w B and d B . By introducing a metal-Bragg grating structure into the metal-dielectric-metal waveguide, the optical Tamm-like state on the interface between the metal and the Bragg grating is effectively excited. The refractive index sensor device has a simple structure, easy preparation, small size, and fast sensing. , and the working wavelength is adjustable, so it has important application prospects in the fields of photonic integration and all-optical networks in the future.
Description
technical field [0001] The invention relates to a metal-medium-metal waveguide Bragg grating-based refractive index sensor, which can be used in the field of nanophotonics and integrated optical technology. Background technique [0002] Surface plasmon polaritons (SPPs) are localized electromagnetic modes localized on the surface of metals / dielectrics. Through the oscillation coupling of electromagnetic waves in the optical frequency band and free electrons in noble metals, the energy of the electromagnetic field is confined to a more within a small scale. The oscillation frequency of this mode is jointly determined by the refractive index of the noble metal and its surrounding environment, so it is very sensitive to the surrounding refractive index environment. In recent years, there are two kinds of surface plasmons used for refractive index sensing, one is surface plasmon resonance (SPR), and the other is localized surface plasmon (localized surface plasmon) resonance, ...
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IPC IPC(8): G01N21/41G02B5/18
CPCG01N21/41G02B5/1809
Inventor 陆云清许敏许烔许吉王瑾
Owner NANJING UNIV OF POSTS & TELECOMM