CN102768386B - Micro-nano fiber downloading filter based on rainbow local effect - Google Patents
Micro-nano fiber downloading filter based on rainbow local effect Download PDFInfo
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- CN102768386B CN102768386B CN201210235922.1A CN201210235922A CN102768386B CN 102768386 B CN102768386 B CN 102768386B CN 201210235922 A CN201210235922 A CN 201210235922A CN 102768386 B CN102768386 B CN 102768386B
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Abstract
The invention provides a micro-nano fiber downloading filter based on the rainbow local effect. The filter comprises a micro-nano fiber (1), wherein a metal grating structure (2) is formed on the surface of the micro-nano fiber (1) by using an optical micromachining technology, and plasmon harmonic oscillations with different wavelengths are localized by the metal grating structure to different spatial positions, and are coupled in different spatial positions by a second micro nano-fiber (4) as download channels to realize downloading of lights with different wavelengths. The device downloads lights with different frequencies based on the rainbow local effect, that is, the device localizes plasmon harmonic oscillations with different wavelengths to different spatial positions by using gradient or chirped grating, so that the download channels are located in different spatial positions to realize downloading of lights with different wavelengths, and in turn realize on-line downloading of optical signals from visible light to the infrared band.
Description
Technical field
What the present invention relates to is the integrated device in a kind of optical fiber communication, and particularly a kind of micro-nano fiber based on rainbow local effect is downloaded wave filter.
Background technology
Surface plasma excimer (Surface Plasmon Polaritons, SPPs) be the caused a kind of surface electromagnetic wave pattern of free electron interaction of light and metal surface, in this interaction, there is collective oscillation in free electron under the light-wave irradiation identical with its resonant frequency.It is confined near metal and medium interface, propagates, and can under particular nanostructure condition, form local fields enhancing along surface.It can overcome diffraction limit, produces the optical phenomena of many novelties, as negative refraction, ultrahigh resolution imaging, transmission enhancing etc.These novel phenomenons are indicating new principle, new theory, new technology.In the time changing metal surface structure, the character of surface plasma excimer, dispersion relation, excitation mode, coupling effect etc. all will produce great variation.By interacting between SPPs and light field, can realize the active manipulation that light is propagated.Surface plasma excimer has obvious advantage aspect the photonic device of development of miniaturized, SPPs for Development of Novel photonic device, wideband communication system, surface plasma photon chip, small photon loop, modulator and switch, data storage, microscope, new type light source, solar cell, novel photon sensor etc. provide may.At present, the subwavelength optics based on SPPs becomes one of research direction with the fastest developing speed in optics and photonics.The optical device of metal surface plasma body has received increasing concern.
Compared with the micro-nano optical waveguide of other types, micro-nano fiber has the preparation of being easy to, simple in structure, diameter uniformity good, loss is low, good mechanical property, should not break, be convenient to and the advantage such as existing fibre system is integrated, integrated very favourable to development small size micro-nano photonic device and development high-density optical.Existing as coupling mechanism, laser instrument, wave filter, interferometer, sensor, fiber grating etc. at present.The micro-nano fiber of difformity xsect is produced out (circle: Nature, 2003,426,816-819, class rectangle: Opt.Lett.2010,35,378-380).The reduction of waveguide dimensions can make the overall dimensions of device reduce, thereby improves integrated level, reduces costs, and micro-nano fiber can brought into play basic effect in the micro-nano optoelectronic device of following sub-wavelength structure.
Optical fiber surface plasmon sensor (seeing U.S. Patent No. 5,647,030 and No.5,327,225) also has a lot of reports.The rainbow capture effect that utilizes the surface plasma of metal grating structure to produce in conventional waveguide substrate has obtained experimental verification at visible light wave range, and this effect will be significant in optical storage field of future generation.Utilize metal grating by the phasmon resonance local of different wave length in different locus, the light of different-waveband will be parked in different locus, can realize the memory function of light signal in different spatial.But current structure is difficult to carry out interconnectedly with existing optical communication system, and rainbow local effect is applied in micro-nano fiber and is have not been reported.
Summary of the invention
The object of the present invention is to provide a kind of visible ray of can realizing to download wave filter to the micro-nano fiber based on rainbow local effect of the light signal download online of infrared band.
The object of the present invention is achieved like this:
Comprise micro-nano fiber 1, utilize optics micro-processing technology to form metal grating structure 2 on micro-nano fiber 1 surface, metal grating structure in different locus, is coupled as download channel and is realized the download of different wavelengths of light by the phasmon resonance local of different wave length by the second micro-nano fiber 4 in different spatial.
The present invention can also comprise:
1, described metal grating structure is graded metal optical grating construction.
2, described metal grating structure is the metal grating structure of warbling.
3, described graded metal optical grating construction refers to that the grid width t of grating periods lambda and raster unit 5 is definite values, and the high h of grid of raster unit 5 is graded, and wideband light source 3 injects from the less side of gradient metal grating height h.
4, the metal grating structure of warbling described in refers to that the high h of grid and the grid width t of raster unit 5 are definite values, and grating periods lambda is the variation of warbling, and wideband light source 3 injects from the less side of the metal grating periods lambda of warbling.
5, described metal grating structure 2 is directly to make gradient or the metal grating structure of warbling of projection on micro-nano fiber 1 surface; Or first utilize photoetching technique to carve the microflute of gradient or chirp grating structure on micro-nano fiber 1 surface, then deposit metal in and in microflute, form flush type metal grating structure.
6, the xsect of described micro-nano fiber 1 is circle, D type or class rectangle.
7, the diameter of described micro-nano fiber 1 is 500-4000 nanometer; Metal grating periods lambda scope is 100-300 nanometer, the high 5-1000 nanometer of grid of raster unit 5, the grid width 30-100 nanometer of raster unit 5.
8, described metal is gold, silver or aluminium.
The invention provides the micro-nano fiber of a kind of microminiature based on rainbow local effect and download wave filter.This device download different frequency only based on rainbow local effect, utilize gradient or chirp grating by the phasmon resonance local of different wave length in different locus, download channel is positioned at different spatial and realizes the download of different wavelengths of light, and then can realize the light signal download online of visible ray to infrared band.
Compared with prior art, advantage of the present invention is:
1, this download wave filter volume is little, simple in structure, is easy to realize full optical fiber integrated, with existing fiber technology carry out interconnected, significant in the micro-nano optoelectronic device for following sub-wavelength structure;
2, this storer can be realized the broadband optical signal download online of visible ray to infrared band.
Brief description of the drawings
Fig. 1 (a) is that the circular micro-nano fiber of projection graded metal grating rainbow local effect is downloaded filter graph architecture;
Fig. 1 (b) is that the circular micro-nano fiber of projection graded metal grating rainbow local effect is downloaded wave filter side throwing figure;
Fig. 1 (c) is annulus metal grating cell schematics;
Fig. 2 (a)-Fig. 2 (c) is to be respectively circle, D shape optical fiber and class rectangle micro-nano fiber xsect;
Fig. 3 is that the circular micro-nano fiber of semicircular ring projection graded metal grating is downloaded filter graph architecture;
Fig. 4 is that the circular micro-nano fiber of metal grating flush type is downloaded filter graph architecture;
Fig. 5 is that the taper micro-nano fiber of projection graded metal grating rainbow local effect is downloaded filter graph architecture;
Fig. 6 (a) be projection warble metal grating rainbow local effect D shape micro-nano fiber download filter graph architecture;
Fig. 6 (b) is rectangular metal raster unit schematic diagram.
Embodiment
For example the present invention is described in more detail below in conjunction with accompanying drawing:
Embodiment 1:
Micro-nano fiber based on rainbow local effect is downloaded wave filter, mainly utilizing optics micro-processing technology to form annular protrusions gradient silver metal optical grating construction 2 on surface by circular micro-nano fiber 1-1 surface forms, download channel has been coupled by micro-nano fiber 4, and wideband light source 3 injects from the less side of gradient metal grating height h.Graded metal optical grating construction 2 refers to that the grid width t of metal grating periods lambda and metal grating unit 5 is definite values, and the high h of grid of metal grating unit 5 is that linear gradient changes.Micro-nano fiber diameter is 2000 nanometers; The metal grating cycle is 200 nanometers, the high 5-1000 nanometer of metal gate, metal grid width 80 nanometers.The light of different wave length will be parked in different positions along fiber length, and micro-nano fiber 4, by the optically-coupled stopping, and then completes download function.
Embodiment 2:
Micro-nano fiber based on rainbow local effect is downloaded wave filter, mainly utilizing optics micro-processing technology to form annulus flush type gradient silver metal optical grating construction 2 on surface by circular micro-nano fiber 1-1 surface forms, download channel has been coupled by micro-nano fiber 4, and wideband light source 3 injects from the less side of gradient metal grating height h.Micro-nano fiber diameter is 2000 nanometers; The metal grating cycle is 180 nanometers, metal grid width 70 nanometers, the linear graded of the high 5-900 nanometer of metal gate.Utilize FDTD emulation, the light of 200THz, 180THz, 3 different frequencies of 150THz is aobvious is parked in different locus, realizes light local function, and the shorter light of wavelength is parked in the side that grating height h is less, and the longer local positions of wavelength is the closer to right side.
Embodiment 3:
Micro-nano fiber based on rainbow local effect is downloaded wave filter, mainly utilizing optics micro-processing technology to form rectangle flush type gradient silver metal optical grating construction 2 at flat surfaces by D shape micro-nano fiber 1-1 surface forms, download channel has been coupled by micro-nano fiber 4, and wideband light source 3 injects from the less side of gradient metal grating height h.Micro-nano fiber diameter is 4000 nanometers; The metal grating cycle is 180 nanometers, metal grid width 70 nanometers, the high 5-900 nanometer of metal gate linear graded, totally 60 cycles.Utilize FDTD emulation, efficiency can decrease than embodiment 2.The light of 300THz, 200THz, 3 different frequencies of 150THz is aobvious is parked in different locus, realizes light local function, and the shorter light of wavelength is parked in the side that grating height h is less, and the longer local positions of wavelength is the closer to right side.
Embodiment 4:
Micro-nano fiber based on rainbow local effect is downloaded wave filter, be mainly that circular taper micro-nano fiber 1-1 surface utilizes optics micro-processing technology to form annular protrusions gradient silver metal optical grating construction 2 on surface to form by xsect, download channel has been coupled by micro-nano fiber 4, and wideband light source 3 injects from the less side of gradient metal grating height h.Graded metal optical grating construction 2 refers to that the grid width t of metal grating periods lambda and metal grating unit 5 is definite values, and the high h of grid of metal grating unit 5 is that linear gradient changes.Micro-nano fiber diameter is 2000 nanometers; The metal grating cycle is 200 nanometers, the high 5-900 nanometer of metal gate, metal grid width 60 nanometers.The light of different wave length will be parked in different positions along fiber length, and micro-nano fiber 4, by the optically-coupled stopping, and then completes download function.
Embodiment 5:
Micro-nano fiber based on rainbow local effect is downloaded wave filter, mainly utilizing optics micro-processing technology to form the rectangular protrusions formula silver metal optical grating construction 2 of warbling at flat surfaces by D shape micro-nano fiber 1-1 surface forms, download channel has been coupled by micro-nano fiber 4, and wideband light source 3 injects from a less side of the metal grating cycle of warbling.The metal grating structure 2 of warbling refers to that the high h of grid and the grid width t of metal grating unit 5 are definite values, and metal grating periods lambda is that linear chrip changes.Micro-nano fiber diameter is 2000 nanometers; The metal grating cycle is 100 nanometers, metal grid width 70 nanometers, the linear graded of the high 5-900 nanometer of metal gate.The light of different frequency is parked in different locus, and then realizes light local function, and the shorter light of wavelength is parked in a less side of grating cycle, and the longer local positions of wavelength is the closer to right side.
Claims (7)
1. the micro-nano fiber based on rainbow local effect is downloaded wave filter, comprise micro-nano fiber (1), it is characterized in that: utilize optics micro-processing technology to form metal grating structure (2) on micro-nano fiber (1) surface, metal grating structure in different locus, is coupled as download channel and is realized the download of different wavelengths of light by the phasmon resonance local of different wave length by the second micro-nano fiber (4) in different spatial;
Described metal grating structure is graded metal optical grating construction or the metal grating structure of warbling;
Described graded metal optical grating construction refers to that the grid width t of grating periods lambda and raster unit (5) is definite value, and the high h of grid of raster unit (5) is graded, and wideband light source (3) injects from the less side of gradient metal grating height h;
The described metal grating structure of warbling refers to that the high h of grid and the grid width t of raster unit (5) are definite values, and grating periods lambda is the variation of warbling, and wideband light source (3) injects from the less side of the metal grating periods lambda of warbling.
2. the micro-nano fiber based on rainbow local effect according to claim 1 is downloaded wave filter, it is characterized in that: described metal grating structure (2) is gradient or the metal grating structure of warbling of directly making projection on micro-nano fiber (1) surface; Or first utilize photoetching technique to carve the microflute of gradient or chirp grating structure on micro-nano fiber (1) surface, then deposit metal in and in microflute, form flush type metal grating structure.
3. the micro-nano fiber based on rainbow local effect according to claim 2 is downloaded wave filter, it is characterized in that: the xsect of described micro-nano fiber (1) is circle, D type or class rectangle.
4. the micro-nano fiber based on rainbow local effect according to claim 3 is downloaded wave filter, it is characterized in that: the xsect of described micro-nano fiber (1) is for circular, and diameter is 500-4000 nanometer; Metal grating periods lambda scope is 100-300 nanometer, the high 5-1000 nanometer of grid of raster unit (5), the grid width 30-100 nanometer of raster unit (5); Described raster unit (5) is to surround the circular ring structure unit of whole micro-nano fiber (1), or the semicircular ring structural unit of semi-surrounding raster unit (5).
5. the micro-nano fiber based on rainbow local effect according to claim 4 is downloaded wave filter, it is characterized in that: described micro-nano fiber (1) is cylindrical or conical fiber.
6. the micro-nano fiber based on rainbow local effect according to claim 3 is downloaded wave filter, it is characterized in that: the xsect of described micro-nano fiber (1) is D type, described metal grating structure is the rectangular raster structural unit forming in the smooth one side of the side direction of D shape.
7. the micro-nano fiber based on rainbow local effect according to claim 3 is downloaded wave filter, it is characterized in that: the xsect of described micro-nano fiber (1) is class rectangle, described metal grating structure is the rectangular raster structural unit that the rectangular raster structural unit that forms in the smooth one side of class rectangle micro-nano fiber side direction or the smooth two sides of class rectangle micro-nano fiber side direction form simultaneously.
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| CN112068238A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Single stress element optical fiber chirped fiber Bragg grating and preparation method thereof |
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| CN102255121A (en) * | 2011-05-11 | 2011-11-23 | 东南大学 | Broadband slow wave system based on cylindrical line waveguide excitation |
| CN102436029A (en) * | 2011-12-27 | 2012-05-02 | 东南大学 | Flexible ultra-long surface plasmon polariton waveguide |
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| CN102255121A (en) * | 2011-05-11 | 2011-11-23 | 东南大学 | Broadband slow wave system based on cylindrical line waveguide excitation |
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Effective date of registration: 20201231 Address after: 572024 area A129, 4th floor, building 4, Baitai Industrial Park, yazhouwan science and Technology City, Yazhou District, Sanya City, Hainan Province Patentee after: Nanhai innovation and development base of Sanya Harbin Engineering University Address before: 150001 Intellectual Property Office, Harbin Engineering University science and technology office, 145 Nantong Avenue, Nangang District, Harbin, Heilongjiang Patentee before: HARBIN ENGINEERING University |
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