CN102928909B - A kind of phase delay device based on surface phasmon - Google Patents
A kind of phase delay device based on surface phasmon Download PDFInfo
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- CN102928909B CN102928909B CN201210419568.8A CN201210419568A CN102928909B CN 102928909 B CN102928909 B CN 102928909B CN 201210419568 A CN201210419568 A CN 201210419568A CN 102928909 B CN102928909 B CN 102928909B
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Abstract
The invention discloses a kind of phase delay device based on surface phasmon, mostly the existing invention about optical phase modulator is based on birefringece crystal with research, the Traditional optics such as liquid crystal, these design the optical device be only applicable to compared with large scale, are unfavorable for integrated.The present invention utilizes metallic surface phasmon characteristic, and phase delay device is narrowed down to nanometer scale, and by changing the dimensional structure of nano particle, effectively can realize phase delay to the light of specific wavelength.This structure can be applied in various optical detection precise instrument.
Description
Technical field
The invention belongs to field of photoelectric technology, relate to a kind of noble metal nano structure, specifically a kind of phase delay device based on surface phasmon.
Background technology
In optical element field, phase delay device can produce additional light path to the light of particular polarization.Modal phase delay device and wave plate.The ultimate principle that wave plate utilizes is the birefringence of material, and namely the refractive index of material in different directions for light is different.Wherein half-wave wave plate can change the polarization direction of linearly polarized light, and quarter-wave plate can change linearly polarized light into circularly polarized light.In addition, liquid crystal phase modulator can realize adjustable phase place change.This series of primary element has been widely used in various optical precision instrument, for the field such as spectrum, optical detection.
Find through the literature search for traditional optical phase modulator, minimum phase delay wave plate is the thinnest dimensionally can reach hundreds of micron.And along with the made rapid progress of integrated optics and modern precision processing technology, the yardstick of integrated optical device also constantly miniaturization thereupon on sheet, reaches nanoscale.In this magnitude, due to the restriction of the birefringent characteristic of material own and refractive index size, above-mentioned relevant design concept no longer can realize, and therefore also can not produce effective nanoscale phase delay element at present.
Summary of the invention
The object of the invention is the deficiency for above-mentioned existing conception and technology, utilize the optical characteristics of metal Nano structure, propose a kind of phase delay device based on surface phasmon.
The technical scheme that the present invention solves the employing of its technical matters is as follows:
The present invention includes transparent substrates and metal nanoparticle.
Described transparent substrates is mainly used in support metal nano particle, adopts isotropy and the optical glass of low dispersion, does not play modulating action to incident light.
Described metal nanoparticle plays main modulating action for incident light, and the shape of metal nanoparticle can be multiple, comprises plate-like, spherical, bar-shaped, triangle; Every three metal nanoparticles are one group, and the shape often organizing metal nanoparticle is the wherein a kind of or wherein unitized construction that forms of several structure, often the back gauge organized between metal nanoparticle is greater than 100 nanometers, and many group metal nanoparticles are cyclic array distribution.Usual metal Nano structure is designed to dish configuration, and from the viewpoint of integrated optics and processing technology, dish configuration is by mask, and etching, evaporation or sputtering realize.
Described metal nanoparticle is of a size of sub-wavelength level, and it is of a size of: diameter 50 nanometer, thickness 10 nanometer, often organizes limit spacing 15 nanometer of particle and particle in metal nanoparticle.The size of metal nanoparticle and structure major effect be the size of phase place for the incident beam modulated.
The beneficial effect that the present invention has is:
The present invention utilizes the optical characteristics of metal nanoparticle, compares existing element volume and greatly reduces (thickness tens nanometer is to hundreds of nanometer), can complete the modulation of phase place, can think a kind of two-dimensional phase delayer on material interface.It is integrated that such structure is easy to extensive optics, can as the critical elements of optical detecting instrument.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention;
Fig. 2 is the cell schematics that the present invention often organizes metal nanoparticle;
Fig. 3 is phase delay of the present invention spectrum.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated: present embodiment case by the present invention propose based on premised on the phase delay device of surface phasmon, but protection scope of the present invention is not limited to following embodiment and case.
As shown in Figure 1, a kind of phase delay device based on surface phasmon comprises transparent substrates 1 and metal nanoparticle.
Described transparent substrates is mainly used in support metal nano particle, adopts isotropy and the optical glass of low dispersion, does not play modulating action to incident light.
Described metal nanoparticle plays main modulating action for incident light, and the shape of metal nanoparticle can be multiple, comprises plate-like, spherical, bar-shaped, triangle; Every three metal nanoparticles are one group, and the shape often organizing metal nanoparticle is the wherein a kind of or wherein unitized construction that forms of several structure, often the back gauge organized between metal nanoparticle is greater than 100 nanometers, and many group metal nanoparticles are cyclic array distribution.In the drawings, metal Nano structure is designed to dish configuration.From the viewpoint of integrated optics and processing technology, dish configuration is by mask, and etching, evaporation or sputtering realize.
As shown in Figure 2, in each group metal nanoparticle, metal nanoparticle shape is plate-like, and material is Jin Heyin, and bi-material all has stronger plasma resonance effect at visible waveband.By the coupling effect of bi-material particle, can spectrally form the modulated window of a phase place, realize specific phase delay function.By replacing the material of metal nanoparticle, also optionally phase-modulation is carried out for the light of certain wavelength coverage.Metal nanoparticle shown in Fig. 2 is of a size of: diameter 50 nanometer, thickness 10 nanometer, often organizes limit spacing 15 nanometer of particle and particle in metal nanoparticle.The size of metal nanoparticle and structure major effect be the size of phase place for the incident beam modulated, structure designed in figure can realize orthogonal two phase differential that polarization causes for target wavelength.And metal nanoparticle 2-2 material middle in figure is gold, the metal nanoparticle 2-2 material on both sides is silver.Polarized light component 3, polarized light component 4 are mutually orthogonal, and incide on metal nanoparticle, then when acting on, plasma resonance occur with metal nanoparticle, produce different phase delay to polarized light component 3, polarized light component 4.
The Phase Modulation Properties under a kind of ad hoc structure size as shown in Figure 3.At short wave ranges (<500nm), this structure is substantially for optical transparency.At long-wave limit (590-650nm), nanostructured reaches for the phase delay of incident light
, and form the window of a wider band, the function of traditional quarter-wave plate can be realized, linearly polarized light and circularly polarized light can be changed mutually.Described metal nanoparticle is of a size of sub-wavelength level.
The phase delay function of phase delay device is determined by the metal Nano structure on substrate.In concrete use, the structure needed for can manufacturing according to demand.Wherein adjustable parameter has: the shape, quantity, size, material, spacing etc. of nano particle.Thus phase place extent, the window's position, window width change thereupon.So just achieve the phase delay device based on surface phasmon.
Claims (1)
1., based on a phase delay device for surface phasmon, comprise transparent substrates and metal nanoparticle; It is characterized in that:
Described transparent substrates is mainly used in support metal nano particle, adopts isotropy and the optical glass of low dispersion;
Described metal nanoparticle plays main modulating action for incident light, and the shape of metal nanoparticle is bar-shaped; Every three metal nanoparticles are one group of the linear alignment, and intermetallic metal nano-particle material is gold, and both sides metal nanoparticle material is silver; Often the back gauge organized between metal nanoparticle is greater than 100 nanometers, and many group metal nanoparticles are cyclic array distribution;
Described metal nanoparticle is of a size of sub-wavelength level, and it is of a size of: diameter 50 nanometer, thickness 10 nanometer, often organizes limit spacing 15 nanometer of metal nanoparticle and metal nanoparticle in metal nanoparticle; The maximum phase that described phase delay device obtains postpones 1.5 π, linearly polarized light can be converted into circularly polarized light.
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| CN201210419568.8A CN102928909B (en) | 2012-10-29 | 2012-10-29 | A kind of phase delay device based on surface phasmon |
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| CN201210419568.8A CN102928909B (en) | 2012-10-29 | 2012-10-29 | A kind of phase delay device based on surface phasmon |
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| CN102928909A CN102928909A (en) | 2013-02-13 |
| CN102928909B true CN102928909B (en) | 2015-10-21 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2535515A (en) * | 2015-02-19 | 2016-08-24 | Univ Birmingham | Metasurface for control of light propogation |
| CN107315204A (en) * | 2017-05-24 | 2017-11-03 | 深圳凌波近场科技有限公司 | Ultra-thin surfaces ripple photonic crystal |
| CN108845412B (en) * | 2018-08-27 | 2020-07-17 | 上海理工大学 | Phase plate design method in compact phase contrast microscope |
| CN111307067A (en) * | 2020-03-30 | 2020-06-19 | 深圳大学 | Optical measuring system |
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| CN101792268A (en) * | 2009-12-31 | 2010-08-04 | 浙江大学 | Method for preparing metal/SiO2 composite granular film by oil-water interface self assembly method |
| CN102706835A (en) * | 2012-05-14 | 2012-10-03 | 中央民族大学 | Sensing chip of dual-detecting biochemical sensing detector and preparation method thereof |
| CN102747320A (en) * | 2012-07-31 | 2012-10-24 | 武汉大学 | Preparation method of noble metal nano-particle array |
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| US6649901B2 (en) * | 2002-03-14 | 2003-11-18 | Nec Laboratories America, Inc. | Enhanced optical transmission apparatus with improved aperture geometry |
| JP2004061870A (en) * | 2002-07-29 | 2004-02-26 | Kyocera Corp | Optical element and optical module using the same |
| US7630132B2 (en) * | 2005-05-23 | 2009-12-08 | Ricoh Company, Ltd. | Polarization control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101792268A (en) * | 2009-12-31 | 2010-08-04 | 浙江大学 | Method for preparing metal/SiO2 composite granular film by oil-water interface self assembly method |
| CN102706835A (en) * | 2012-05-14 | 2012-10-03 | 中央民族大学 | Sensing chip of dual-detecting biochemical sensing detector and preparation method thereof |
| CN102747320A (en) * | 2012-07-31 | 2012-10-24 | 武汉大学 | Preparation method of noble metal nano-particle array |
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