CN107546572A - A kind of high q-factor drop microcavity based on the shaping of column waveguide surface - Google Patents
A kind of high q-factor drop microcavity based on the shaping of column waveguide surface Download PDFInfo
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- CN107546572A CN107546572A CN201710422726.8A CN201710422726A CN107546572A CN 107546572 A CN107546572 A CN 107546572A CN 201710422726 A CN201710422726 A CN 201710422726A CN 107546572 A CN107546572 A CN 107546572A
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Abstract
The invention discloses a kind of high q-factor drop microcavity based on the shaping of column waveguide surface, including column waveguide, surface drop, isolating device, conical fiber.Smooth spherical microcavity is formed in column waveguide surface by surface tension, the size of drop microcavity is determined by the size of column waveguide.Dismountable isolating device is housed around column waveguide.Column waveguide surface drop microcavity and conical fiber carry out evanscent field coupling, excite Whispering-gallery-mode in drop microcavity to resonate by total reflection mechanism, obtain with high quality factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.The drop microcavity of the present invention is prepared at room temperature, has the characteristics that technique is simple, shaping efficiency is high, quality factor are high, Whispering-gallery-mode resonance in intracavitary arrowband is strong.The present invention has a wide range of applications potential in Fibre Optical Sensor and fiber optic communication field.
Description
Technical field
The invention belongs to optical microcavity technical field, more particularly to Whispering-gallery-mode drop microcavity, and in particular to Yi Zhongji
In the high q-factor drop microcavity of column waveguide surface shaping.
Background technology
Echo wall mode optical micro-cavity has high quality factor, minimum model volume, extremely narrow breadth of spectrum line and surpassed
High energy density, also have the advantages that size is small, easy of integration, low cost relative to Fabry-Perot-type cavity.Just because of optics
The plurality of advantages of microcavity, how easily to produce one of key content that the optical microcavity of high-quality is studied into people.
It is huge that the high q-factor of Whispering-gallery-mode microcavity and the characteristic that can be integrated make it have in fiber optic communication and light sensing field
Application potential, such as available for efficient wave filter, highly sensitive sensor, low threshold laser, nonlinear effect and letter
Number delayer etc..In this respect, the Vahala research groups of Caltech, which make, much starts sex work, proposes low threshold first
It is worth the application such as raman laser, single-molecule detection.Strikingly Whispering-gallery-mode can also pass through with other photoelectric devices
The different interconnection of ripple, it is expected to applied to actual high-speed optical signal processing and environment detection etc..Because the mode volume of microcavity is very small,
Also can produce very strong electric field in intracavitary even if single photon, can with other physics system strong interactions, therefore non-
There is important application in the fields such as linear optics, Eurytrema coelomatium and quantum photomechanical effect.
Currently used microcavity preparation method has semi-conducting material etching method, amorphous glass material molten method and polymerization
Thing materials synthesis method.The microcavity rough surface that etching technics is directly prepared, the quality factor of chamber receive very big limitation；Fusion method
In manufacturing process, due to surface tension effects, the smooth shape of self-assembling formation is understood, so as to obtain very high quality factor, but
It, which forms the asymmetry of microcavity, makes caused echo wall die resonance spectrum side mode suppression ratio relatively low；Polymeric material has good
Plasticity and can repeat to process, but its quality factor still has much room for improvement.Although list can be prepared by these methods
The microcavity array that individual high-quality microcavity or preparation intercouple, still, these preparation methods have higher requirements to experimental facilities,
With significant limitation, can not be realized in common laboratory.
Traditional drop microcavity is without special carrier, directly by liquid molding, although preparing simple, suitable most of laboratories
Condition, but its common problem is that quality factor are not high, not strong enough, the drop microcavity size of intracavitary arrowband Whispering-gallery-mode resonance
It is uncontrollable etc..
The content of the invention
For the limitation of prior art, the present invention proposes a kind of high q-factor drop based on the shaping of column waveguide surface
Microcavity.The carry out evanscent field coupling of column waveguide surface drop microcavity and conical fiber, excites drop micro- by total reflection mechanism
Intracavitary Whispering-gallery-mode resonates, and obtains with high quality factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.This hair
Bright drop microcavity is prepared at room temperature, with technique is simple, shaping efficiency is high, quality factor are high, intracavitary arrowband echo wall die
The features such as formula resonance is strong.
To achieve the above object, the technical scheme is that a kind of high q-factor drop based on the shaping of column waveguide surface
Microcavity, including column waveguide, surface drop and isolating device, the surface drop is by surface tension in column waveguide surface shape
Into smooth spherical drop microcavity, while detachable isolating device is housed around column waveguide, for realizing vibration isolation, heat-insulated,
Column waveguide is disposed vertically with conical fiber, allows the drop microcavity on its surface and conical fiber to contact by mobile column waveguide,
So as to realize that evanscent field couples, Whispering-gallery-mode in drop microcavity is excited to resonate by total reflection mechanism, acquisition has high-quality
Factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.
Further, above-mentioned column waveguide is cylindrical fiber, and waveguide therein can be made up of any optical material.It is above-mentioned
Cylindrical fiber includes but is not limited to solid cylindrical optical fiber, hollow tubular optical fiber.
Further, above-mentioned drop is transparency liquid.Above-mentioned transparency liquid includes but is not limited to pure water, alcohol, salt solution.
Further, the position that above-mentioned drop microcavity is formed, can be by changing column waveguide in column waveguide side surface
External diameter controls drop microcavity size.
Further, above-mentioned column waveguide dimensions external diameter is micron level, and size is between tens to hundreds of microns.
The present invention compared with prior art, is had the advantages that using above technical scheme：
(1) present invention uses fluid as microcavity material, have prepare easily, the characteristics of technique is simple, while can be with
Microcavity refractive index is controlled by changing solute concentration in liquid, there is wider array of application；
(2) drop is attached to column waveguide side by the present invention, and the echo wall die excited in the spherical microcavity of formation is total to
Spectrum of shaking has the advantages of Q values are high, FSR is big, transmission spectrum depth depth；
(3) present invention is placed on coupling device using column waveguide as drop microcavity carrier, is easy to and conical fiber
Realize that evanscent field couples.
Brief description of the drawings
Fig. 1 is the structural representation of the high q-factor drop microcavity based on the shaping of column waveguide surface.
Fig. 2 is the drop microcavity pictorial diagram based on the shaping of column waveguide surface in embodiment.
Fig. 3 is to be excited in embodiment using a kind of high q-factor drop microcavity based on the shaping of column waveguide surface of the present invention
The experimental system figure of Whispering-gallery-mode resonance spectrum.
Fig. 4 is the Whispering-gallery-mode resonance spectrum ratio of the drop microcavity of different size of column waveguide surface shaping in embodiment
Compared with figure.
Embodiment
Technical scheme is described in further detail below in conjunction with the accompanying drawings：
The present invention is to be coupled by the drop microcavity formed in column waveguide surface with the evanscent field of conical fiber, and light field is entered
After entering liquid microcavity, total reflection is formed at drop medium and air-medium interface, Whispering-gallery-mode resonates in excitation cavity, obtains
Composition has high quality factor, obtains with high quality factor, narrow bandwidth, the echo wall die resonance spectrum of periodic swinging.
It is as shown in Figure 1 a kind of high q-factor drop micro-cavity structure schematic diagram based on the shaping of column waveguide surface of the present invention,
Including column waveguide 1, surface drop 2, isolating device 3.Drop forms smooth ball in column waveguide surface by surface tension
Shape microcavity.Dismountable isolating device is housed in column waveguide simultaneously, improves the stability of microcavity.
Microcavity and conical fiber are coupled using column waveguide, so as to realize being pumped into for light wave, form Whispering-gallery-mode.
It is illustrated in figure 2 a kind of high q-factor drop microcavity material object photo based on the shaping of column waveguide surface of the present invention.
In embodiment, liquid used is pure water, and column waveguide used is hollow capillary glass optical fiber.By in capillary fiber
One end is slowly injected into liquid, drop is formed in its other end, because surface tension effects drop can be along capillary after stopping water filling
Pipe outer wall moves, so as to form spherical microcavity as shown in Figure 2.Column waveguide external diameter used is 80 μm in Fig. 2, and conical fiber is straight
Footpath is 2.5 μm, wherein drop microcavity size is sequentially reduced in (a) (b) (c).
It is illustrated in figure 3 and is excited back using a kind of high q-factor drop microcavity based on the shaping of column waveguide surface of the present invention
The experimental system figure of sound wall mode resonance spectrum, wherein.In the present embodiment, it is tunable sharp by the way that the one end of conical fiber 5 is connected
Light device and Polarization Controller 4, the other end connects photodetector.The light of tunable laser output is coupled into by conical fiber
Enter drop microcavity and form Whispering-gallery-mode resonance in its inner total reflection；Polarization Controller is used for swashing for control input conical fiber
Polarization state；The Whispering-gallery-mode that photodetector is used to record and analyze conical fiber and drop microcavity coupled system transmits
Spectrum.
The Whispering-gallery-mode Resonance Transmission spectrum of the drop microcavity of three kinds of sizes in Fig. 2 is illustrated in figure 4, wherein (b) figure is
(a) partial enlarged drawing of the figure near 1550.8nm.As can be seen that most deep Whispering-gallery-mode resonance spectrum transmission peaks depth reaches
21.4dB is arrived, Q values reach 105, it is sufficient to compared with general silica microcavity, simultaneously because drop size is larger, its FSR
5.2nm can be reached, much larger than the echo wall die resonance spectrum FSR of common hundreds of micron silica microcavitys.
Specific embodiments described above, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Detailed description, should be understood that and the foregoing is only specific embodiments of the present invention, be not limited to this hair
Bright scope, any those skilled in the art, that is made on the premise of the design of the present invention and principle is not departed from is equal
Change and modification, all should belong to the scope of protection of the invention.
Claims (7)
1. a kind of high q-factor drop microcavity based on the shaping of column waveguide surface, it is characterised in that including column waveguide, surface liquid
Drop and isolating device, the surface drop form smooth spherical microcavity in column waveguide surface by surface tension, while
Detachable isolating device is housed around column waveguide, for realizing vibration isolation, heat-insulated, column waveguide is disposed vertically with conical fiber,
The drop microcavity on its surface and conical fiber is allowed to contact by mobile column waveguide, so as to realize that evanscent field couples, by being all-trans
The mechanism of penetrating excites Whispering-gallery-mode in drop microcavity to resonate, and obtains the echo with high quality factor, narrow bandwidth, periodic swinging
Wall mould resonance spectrum.
A kind of 2. high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, it is characterised in that
The column waveguide is cylindrical fiber, and waveguide therein can be made up of any optical material.
A kind of 3. high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 2, it is characterised in that institute
Stating cylindrical fiber includes solid cylindrical optical fiber, hollow tubular optical fiber.
A kind of 4. high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, it is characterised in that
Described drop is transparency liquid.
A kind of 5. high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 4, it is characterised in that
The transparency liquid includes pure water, alcohol, salt solution.
A kind of 6. high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, it is characterised in that
The position that described drop microcavity is formed can control drop in column waveguide side surface by changing the external diameter of column waveguide
Microcavity size.
A kind of 7. high q-factor drop microcavity based on the shaping of column waveguide surface according to claim 1, it is characterised in that
The column waveguide dimensions external diameter size is between tens to hundreds of microns.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108897100A (en) * | 2018-05-14 | 2018-11-27 | 北京航空航天大学 | A kind of liquid deformation micro-cavity structure and its application method with hydrophobic surface waveguide coupling |
| CN108896512A (en) * | 2018-07-18 | 2018-11-27 | 清华-伯克利深圳学院筹备办公室 | The detection device and method of microfluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103345021A (en) * | 2013-06-28 | 2013-10-09 | 厦门大学 | Method for manufacturing hemi-spherical optical micro-resonant-cavity |
| CN104852259A (en) * | 2015-05-22 | 2015-08-19 | 哈尔滨工程大学 | Liquid drop whispering gallery mode laser and manufacturing method thereof |
| CN105098575A (en) * | 2015-07-22 | 2015-11-25 | 南京邮电大学 | Narrow-band fiber laser for mixed medium microcavity full-optical tuning |
| CN207409797U (en) * | 2017-06-07 | 2018-05-25 | 南京邮电大学 | A kind of high q-factor drop microcavity based on the shaping of column waveguide surface |
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2017
- 2017-06-07 CN CN201710422726.8A patent/CN107546572A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103345021A (en) * | 2013-06-28 | 2013-10-09 | 厦门大学 | Method for manufacturing hemi-spherical optical micro-resonant-cavity |
| CN104852259A (en) * | 2015-05-22 | 2015-08-19 | 哈尔滨工程大学 | Liquid drop whispering gallery mode laser and manufacturing method thereof |
| CN105098575A (en) * | 2015-07-22 | 2015-11-25 | 南京邮电大学 | Narrow-band fiber laser for mixed medium microcavity full-optical tuning |
| CN207409797U (en) * | 2017-06-07 | 2018-05-25 | 南京邮电大学 | A kind of high q-factor drop microcavity based on the shaping of column waveguide surface |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108897100A (en) * | 2018-05-14 | 2018-11-27 | 北京航空航天大学 | A kind of liquid deformation micro-cavity structure and its application method with hydrophobic surface waveguide coupling |
| CN108896512A (en) * | 2018-07-18 | 2018-11-27 | 清华-伯克利深圳学院筹备办公室 | The detection device and method of microfluid |
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Application publication date: 20180105 |