CN1996066A - Wave-structured film beam polarizer - Google Patents
Wave-structured film beam polarizer Download PDFInfo
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- CN1996066A CN1996066A CN 200610053945 CN200610053945A CN1996066A CN 1996066 A CN1996066 A CN 1996066A CN 200610053945 CN200610053945 CN 200610053945 CN 200610053945 A CN200610053945 A CN 200610053945A CN 1996066 A CN1996066 A CN 1996066A
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- structured film
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- film polarizer
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Abstract
The invention relates to a wave structure thin film component for optical polarization beam splitting. The multi-layer wave like thin film formed new polarized component uses the media materials with two different refraction rates and proper wave like film structure parameter required optical wave polarization feature. It expands the incidence angle of the polarization component with fully banned or fully through concept, allowing the wave structure thin film polarization component having polarized beam splitting function. It makes the polarization component with high polarization, wide material selection range, low making cost, heat resistant, with less optical consumption, adjustable incidence angle and frequency.
Description
Affiliated technical field
The present invention relates to beam polarizer, specifically is a kind of Wave-structured film beam polarizer.
Background technology
Polarizer is the device that natural light is transformed into polarized light.What traditional polarizer that is made of the one dimensional optical film relied on is Brewster angle, need use under the cooperation of glass prism, if incident angle has departed from Brewster angle, degree of polarization can obviously descend.The birefringece crystal of single shaft also can separate o light and e light, but it is to the system of being limited in scope of incident angle, and the volume of device is often very big.Some crystal and polymeric material can utilize dichroism that the light of different polarization direction is carried out selectivity to absorb, because be operated in absorption mode, so be not suitable for the high light occasion.These traditional polarizers all are difficult in the modern integrated optics and are applied.
China Patent No. 98110990.X is authorized notification number CN1214453A, is authorized April 21 1999 day for announcing, and name is called " two-dimensional photon crystal polarizer and preparation method ", this patent disclosure a kind of two-dimensional photon crystal polarizer spare that constitutes by dielectric material.In addition, China Patent No. 02111812.4 is authorized notification number CN1383002A, is authorized Dec 4 2002 day for announcing, name is called " splitter for high-polarization polarized light beam in visual light band ", this patent disclosure a kind of two-dimensional photon crystal polarizer spare that constitutes by metal material.Their ultimate principle all is to utilize the bandgap structure of photonic crystal to carry out light beam polarization, shortcoming is the processing technology complexity of 2 D photon crystal periodic micro structure, particularly at light-wave band, the size of microstructure reaches sub-micrometer scale, need to rely on expensive high-accuracy manufacturing equipment, cost of investment is too high.
Summary of the invention
The purpose of this invention is to provide a kind of Wave-structured film beam polarizer, utilize traditional thin film preparation process, reduced the cost of manufacture of device, can obtain very high light beam polarization performance index simultaneously again.
The technical solution adopted in the present invention is:
One, the Wave-structured film beam polarizer under the vertical incidence situation: the light beam polarization device is that the wavy film by multilayer constitutes, belong to two-dimensional periodic structure, the structure grid is a rectangle, does not have the scatterer that is separated from each other in inside configuration, is different from the ordinary two dimensional photon crystal structure.Film is selected the dielectric material of two kinds of refractive indexes of height for use, and the ratio of refractive index should be greater than 1.6, and the film surface pattern can be two kinds of triangle and sinusoidals.The present invention has utilized passband and forbidden band in being with by the band theory of two-dimensionally periodic structure, and light can't be propagated and will be reflected in the forbidden band, and light can transmission in passband.For Wave-structured film, polarized light divides two kinds of TE mould and TM moulds, under the situation of vertical incidence angle, two kinds of polarization states have different band structures, can form by a series of passband and forbidden band by band, when the forbidden band/passband of the passband/forbidden band of TE mould and TM mould is overlapping, just can utilize the reflection in forbidden band and the transmission of passband that two kinds of polarization states are separated.Wave-structured film can be used as the polarizer and analyzer uses.
Two, the Wave-structured film beam polarizer under the oblique incidence situation: the light beam polarization device is made of the wavy film of multilayer, by complete forbidden band in the two-dimensionally periodic structure band theory and complete passband, the forbidden band means in the plane of incidence fully, polarized light all can be reflected fully with arbitrarily angled incident, can both propagate in Wave-structured film inside when passband means polarized light with arbitrarily angled incident fully, and transmitance is higher.For Wave-structured film, polarized light divides two kinds of TE mould and TM moulds, when the complete forbidden band of the forbidden band of the complete passband of TE mould/fully and TM mould/when complete passband is overlapping, just can utilize the reflection in complete forbidden band two kinds of polarization states to be separated with the transmission of complete passband, because can under the situation of oblique incidence, carry out work, the polarized light that is reflected not can with the same light path of incident beam, use so Wave-structured film beam polarizer can be used as polarization beam apparatus.
Beneficial effect of the present invention: the present invention has the scale character of two-dimensionally periodic structure, structural cycle is amplified or dwindles a factor, and the corresponding work wavelength also amplifies thereupon or dwindles the identical factor, and guarantees that the performance index of polarizer are constant.Advantages such as the present invention utilizes Wave-structured film to realize light beam polarization, is applicable to two kinds of situations of vertical incidence and oblique incidence, has the degree of polarization height, and the material range of choice is wide, and cost of manufacture is low, and is high temperature resistant are applicable to microwave, infrared and visible light wave range.
Description of drawings
Fig. 1 is the structural representation of Wave-structured film;
Fig. 2-the 1st, the TE mould transmission spectrum of Wave-structured film and band structure synoptic diagram under the vertical incidence situation;
Fig. 2-the 2nd, the TM mould transmission spectrum of Wave-structured film and band structure synoptic diagram under the vertical incidence situation;
Fig. 3 is the transmission spectrum comparison synoptic diagram of TE mould and TM mould;
Fig. 4 is the band structure synoptic diagram of Wave-structured film, and dash area is the complete forbidden band of TM mould;
Fig. 5-the 1st, the TM modular angle degree transmission spectrum of Wave-structured film;
Fig. 5-the 2nd, the TE modular angle degree transmission spectrum of Wave-structured film;
Embodiment
Embodiment 1: the Wave-structured film beam polarizer under the vertical incidence situation
Wave-structured film as shown in Figure 1, rete is along the period L of Z direction
zBe taken as 480nm, the thickness T of high-index material is taken as 160nm, and wavy texture is along the period L of directions X
xBe taken as 560nm, the inclination angle [theta] of wavy rete is taken as 45 degree, and the two media material is selected Si (n=3.5) and SiO respectively for use
2(n=1.5), light beam is along Z axle vertical incidence.Fig. 2 has provided transmission spectrum and each self-corresponding band structure of TE mould and TM mould.Fig. 3 has provided the transmission spectrum comparison of two kinds of polarization states, at L
z/ λ=0.165-0.18 and L
zIn/λ=two frequency bands of 0.275-0.36, the high saturating TM mould of TE mould is reflected, at L
zThe TE mould is reflected and the TM mould is high saturating in/λ=0.21-0.255 frequency band.According to L
zCurrent setting, these frequency bands are positioned near infrared range.It is pointed out that the degree of polarization that will reach higher, the rete cycle need repeat more than 10 times.In addition, the setting of structural parameters is not unique, as long as the refringence of the feasibility of assurance actual fabrication and selected two media material is enough big, even structural parameters change to some extent, the difference of being with of two kinds of polarization states still exists, and is that change has taken place residing frequency range.
Embodiment 2: the Wave-structured film beam polarizer under the oblique incidence situation
Wave-structured film as shown in Figure 1, L
zBe taken as 440nm, T is taken as 140nm, L
xBe taken as 560nm, θ is taken as 45 degree, and the two media material is selected Si (n=3.5) and SiO respectively for use
2(n=1.5).Fig. 4 has provided the band structure of TE mould and TM mould, and the complete forbidden band of TM mould is at L
z/ λ=0.29-0.30.The second of (being X-M-X ') TE mould can be with the below that all is positioned at the complete forbidden band of TM mould on the border of first Brillouin zone, taking up an official post on the border, getting a bit links to each other with center Γ has represented Wave-structured film inside wave vector direction arbitrarily, known Γ point and borderline corresponding TE calligraphy or painting model are levied the above and below that frequency lays respectively at the complete forbidden band of TM mould, according to the continuity that can be with, explanation on this wave vector direction the TE mould can be with the complete forbidden band of necessarily having passed through the TM mould, because above-mentioned wave vector direction is arbitrarily, so all there is the equitant passband in complete forbidden band with the TM mould in the TE mould on all wave vector directions.Fig. 5 has provided the angle transmission spectrum of TE mould and TM mould, and the mean transmissivity of TM mould is no more than 0.5%; For the TE mould, the high saturating zone of 1480nm is spent between 37 degree 27, and 1500nm can satisfy the polarization beam splitting requirement under the oblique incidence situation in 12 degree.
Claims (8)
1. Wave-structured film polarizer is characterized in that it being the two-dimensionally periodic structure that the wavy rete by the two media material constitutes, and the surface undulation pattern of rete is in full accord.
2. according to power 1 described Wave-structured film polarizer, it is characterized in that film has adopted the dielectric material of two kinds of refractive indexes of height, and the ratio of high low-refraction should be greater than 1.6.
3. according to power 1 described Wave-structured film polarizer, it is characterized in that the cycle of rete should repeat more than 10 times.
4. according to power 1 described Wave-structured film polarizer, the wavy profile that it is characterized in that rete can be two kinds of triangle and sinusoidals.
5. according to power 1 described Wave-structured film polarizer, it is characterized in that under the vertical incidence situation, to carry out rising partially or analyzing of light beam.
6. according to power 1 described Wave-structured film polarizer, it is characterized in that the light beam that can carry out multiband rises partially or analyzing, transmitted light and polarization of reflected light attitude are decided by working frequency range.
7. according to power 1 described Wave-structured film polarizer, it is characterized in that and can carry out polarization beam splitting under light beam oblique incidence situation, transmission-polarizing is the TE mould, and polarization by reflection is the TM mould, incident angle has certain limit, with the corresponding change of variation ranges of incidence angles of frequency.
8. according to power 1 described Wave-structured film polarizer, it is characterized in that device is made of dielectric material, optical loss is little,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610053945 CN1996066A (en) | 2006-10-25 | 2006-10-25 | Wave-structured film beam polarizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610053945 CN1996066A (en) | 2006-10-25 | 2006-10-25 | Wave-structured film beam polarizer |
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| Publication Number | Publication Date |
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| CN1996066A true CN1996066A (en) | 2007-07-11 |
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| CN 200610053945 Withdrawn CN1996066A (en) | 2006-10-25 | 2006-10-25 | Wave-structured film beam polarizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017054114A (en) * | 2015-09-07 | 2017-03-16 | 有限会社オートクローニング・テクノロジー | Optical waveguide device of photonic crystal perpendicular type |
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2006
- 2006-10-25 CN CN 200610053945 patent/CN1996066A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017054114A (en) * | 2015-09-07 | 2017-03-16 | 有限会社オートクローニング・テクノロジー | Optical waveguide device of photonic crystal perpendicular type |
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