CN103401050A - Electromagnetic wave focuser based on whispering gallery (WG) mode - Google Patents
Electromagnetic wave focuser based on whispering gallery (WG) mode Download PDFInfo
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- CN103401050A CN103401050A CN2013102421617A CN201310242161A CN103401050A CN 103401050 A CN103401050 A CN 103401050A CN 2013102421617 A CN2013102421617 A CN 2013102421617A CN 201310242161 A CN201310242161 A CN 201310242161A CN 103401050 A CN103401050 A CN 103401050A
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Abstract
The invention relates to an electromagnetic wave focuser based on a WG mode. The focuser comprises an annular medium resonator (1), a medium waveguide (2) and an arched metal raster (3), The annular medium resonator is of a circular, oval or polygonal enclosed structure, the distance between the medium waveguide and the annular medium resonator can be adjusted according to design, and the arched metal raster is made of material whose dielectric constant satisfies Drude dispersion characteristic, such as gold (Au) and silver (Ag). Work frequency of the focuser is greater than plasma frequency of material of the arched metal raster, and the dielectric constant of the arched metal raster is negative. According to the invention, the arched metal raster is used to improve transmittance of electromagnetic waves, and the material with the negative dielectric constant is used to amplify an evanescent field; and the arched metal raster is placed at the inner side of the micro-cavity medium resonator, thereby realizing electromagnetic focusing.
Description
Technical field
The present invention relates to a kind of focalizer, especially a kind of electromagnetic focusing device that adopts the dielectric resonance microcavity.
Background technology
When electromagnetic wave at dielectric resonance microcavity inner surfaces such as annulus, disks after Multi reflection forms closed loop, can produce Whispering-gallery-mode (WG mould: Whispering Gallery Mode).WG mould dielectric resonator has that the Q value is high, compact conformation and be easy to the advantages such as integrated, in fields such as sensing and optical integrated circuits, has extensive use.WG mould transducer has utilized the interaction of measured matter and dielectric resonance microcavity surface evanescent field to realize detection to micro-biological and chemical sample., at the material that dielectric resonator surface coverage high-index material, mushy material or refractive index change in gradient, be all to improve the method for transducer sensitivity by the interaction that strengthens evanescent field and material.In addition, dielectric constant and/or magnetic permeability are attached to dielectric resonance microcavity surface for-1 super material, can reach the purpose that strengthens evanescent field and improve transducer sensitivity.Yet there is not super material in occurring in nature, and is more difficult by artificial synthetic method obtains certain dielectric constant and magnetic permeability in broadband range super material.Therefore, invent and a kind ofly electromagnetic energy can be converged at the focalizer of specific region, the interaction of enhanced field and material is to improving transducer sensitivity and realizing that Detection of Weak Signals is significant.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of device of electromagnetic focusing based on echo wall die is provided, and it can concentrate on electromagnetic energy at the micro-resonant cavity center, realizes that efficient electromagnetic energy focuses on and Detection of Weak Signals.
For achieving the above object, technical scheme of the present invention is: a kind of device of electromagnetic focusing based on echo wall die comprises annular medium micro resonator, dielectric waveguide and curved metal grating.
Further, described annular medium micro resonator is the closing structures such as circle, ellipse or polygon, and its material is the materials such as silicon, silica; Described dielectric waveguide material is identical with annular medium micro resonator, and coupling distance is adjustable according to toroidal cavity resonator structure, size and operating frequency; Dielectric waveguide is coupled to electromagnetic wave energy in toroidal cavity resonator, forms Whispering-gallery-mode.
Further, it is inboard that described curved metal grating is placed in annular medium micro resonator, and its dielectric constant meets the Drude dispersion characteristics:
, wherein,
For plasma frequency,
For collision frequency,
For operating frequency, when
The time,
The present invention has utilized the curved metal grating enough to improve the characteristic of Electromagnetic wave penetrating percentage and negative permittivity material amplification evanescent field, the curved metal grating that material dielectric constant is met the Drude dispersion characteristics is placed in medium micro resonator inboard, has reached the electromagnetic focusing effect.
Description of drawings
Fig. 1 is a kind of device of electromagnetic focusing based on echo wall die of the present invention structural representation.
Fig. 2 is a kind of device of electromagnetic focusing based on echo wall die of the present invention Distribution of Magnetic Field simulation result.
Fig. 3 is a kind of simulation result of total energy density profile based on echo wall die of the present invention.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Be illustrated in figure 1 as a kind of device of electromagnetic focusing based on echo wall die structural representation, this focalizer comprises: annular medium micro resonator 1., dielectric waveguide 2. with the curved metal grating 3..In the present embodiment, annular medium micro resonator outer radius R
1=2.5 μ m, inside radius R
2=2.2 μ m, material are silicon dioxide, dielectric waveguide width w=0.3 μ m, length L=6.5 μ m, coupling distance g=0.135 μ m; Curved metal grating outer radius R
3=2.17 μ m, inside radius R
4=2.14 μ m, cycle θ=15
o, raster width θ '=10
o, material is gold, dispersion characteristics meet
, wherein,
Hz,
Hz; Operating frequency is
Hz.
Utilize a kind of device of electromagnetic focusing based on echo wall die of COMSOL Multiphysics software emulation the present invention performance, Distribution of Magnetic Field and total energy density profile simulation result are seen Fig. 2 and shown in Figure 3.As seen from Figure 2, in annular medium micro resonator, formed echo wall die, its pattern count is 24, and the magnetic field intensity maximum is positioned at the resonator center; As seen from Figure 3, maximum at resonator center total energy density, reached the electromagnetic focusing effect, strengthened the interaction of field with material.
The above is described enforcement of the present invention by reference to the accompanying drawings; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; rather than restrictive; those of ordinary skill in the art is under enlightenment of the present invention;, not breaking away from the scope situation that aim of the present invention and claim protect, can also make many forms, within this all belongs to protection of the present invention.
Claims (6)
1. the device of the electromagnetic focusing based on echo wall die, is characterized in that, this focalizer comprises: annular medium micro resonator (1), dielectric waveguide (2), curved metal grating (3); Dielectric waveguide (2) is coupled to annular medium micro resonator (1) with electromagnetic wave, and annular medium micro resonator (1) inner surface evanescent field and curved metal grating (3) interact, in be formed centrally electromagnetic focusing.
2. the device of the electromagnetic focusing based on echo wall die as claimed in claim 1, it is characterized in that: described annular dielectric resonator is closing structure, is shaped as circle, ellipse, polygon, its girth is the integral multiple of electromagnetic wavelength.
3. the device of the electromagnetic focusing based on echo wall die as claimed in claim 1, it is characterized in that: the distance between described dielectric waveguide and annular dielectric resonator is relevant with size, structure and the operating frequency of annular dielectric resonator, and is adjustable according to designing requirement.
4. the device of the electromagnetic focusing based on echo wall die as claimed in claim 1, it is characterized in that: the curved metal grating consists of the material that dielectric constant meets the Drude dispersion characteristics.
5. the device of the electromagnetic focusing based on echo wall die as claimed in claim 4, is characterized in that the material that described dielectric constant meets the Drude dispersion characteristics is gold, silver.
6. the device of the electromagnetic focusing based on echo wall die as claimed in claim 1 is characterized in that: operating frequency is less than the plasma frequency of curved metal grating, and at this moment, the dielectric constant of curved metal grating is for negative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310242161.7A CN103401050B (en) | 2013-06-19 | 2013-06-19 | A kind of electromagnetic wave focalizer based on echo wall die |
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|---|---|---|---|
| CN201310242161.7A CN103401050B (en) | 2013-06-19 | 2013-06-19 | A kind of electromagnetic wave focalizer based on echo wall die |
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| CN103401050A true CN103401050A (en) | 2013-11-20 |
| CN103401050B CN103401050B (en) | 2015-10-21 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104979751A (en) * | 2015-07-22 | 2015-10-14 | 中国科学院半导体研究所 | Ring micro-cavity laser with directional output |
| CN104990871A (en) * | 2015-06-16 | 2015-10-21 | 电子科技大学 | Optical waveguide biochemical sensor with grating annulet intermodulation structure |
| CN107818910A (en) * | 2017-11-22 | 2018-03-20 | 华南理工大学 | A kind of novel magnetic ring dipole focuses on amplification resonator |
| CN110319861A (en) * | 2018-03-30 | 2019-10-11 | 天津大学 | A kind of micro-resonant cavity structure of achievable double-sensing application |
| CN114660726A (en) * | 2022-03-23 | 2022-06-24 | 中国科学技术大学 | Optical microcavity |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003249803A (en) * | 2002-02-22 | 2003-09-05 | Yamaguchi Technology Licensing Organization Ltd | Dielectric resonator |
| CN103091340A (en) * | 2013-02-22 | 2013-05-08 | 云南大学 | Micro-strip surface whispering gallery mode sensor |
-
2013
- 2013-06-19 CN CN201310242161.7A patent/CN103401050B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003249803A (en) * | 2002-02-22 | 2003-09-05 | Yamaguchi Technology Licensing Organization Ltd | Dielectric resonator |
| CN103091340A (en) * | 2013-02-22 | 2013-05-08 | 云南大学 | Micro-strip surface whispering gallery mode sensor |
Non-Patent Citations (3)
| Title |
|---|
| JINGJING YANG ET AL: "Double negative metamaterial sensor based on microring resonator", 《IEEE SENSORS JOURNAL》 * |
| 杨成福: "基于超材料的椭圆形电磁波聚焦器设计", 《光子学报》 * |
| 杨杰: "零电磁材料聚焦器", 《强激光与粒子束》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990871A (en) * | 2015-06-16 | 2015-10-21 | 电子科技大学 | Optical waveguide biochemical sensor with grating annulet intermodulation structure |
| CN104979751A (en) * | 2015-07-22 | 2015-10-14 | 中国科学院半导体研究所 | Ring micro-cavity laser with directional output |
| CN104979751B (en) * | 2015-07-22 | 2018-09-11 | 中国科学院半导体研究所 | A kind of annulus micro-cavity laser of orientation output |
| CN107818910A (en) * | 2017-11-22 | 2018-03-20 | 华南理工大学 | A kind of novel magnetic ring dipole focuses on amplification resonator |
| CN110319861A (en) * | 2018-03-30 | 2019-10-11 | 天津大学 | A kind of micro-resonant cavity structure of achievable double-sensing application |
| CN110319861B (en) * | 2018-03-30 | 2021-07-30 | 天津大学 | Micro-resonant cavity structure capable of realizing double-sensing application |
| CN114660726A (en) * | 2022-03-23 | 2022-06-24 | 中国科学技术大学 | Optical microcavity |
| CN114660726B (en) * | 2022-03-23 | 2023-03-10 | 中国科学技术大学 | Optical microcavity |
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| CN103401050B (en) | 2015-10-21 |
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Granted publication date: 20151021 Termination date: 20160619 |