CN113358576B - Full silicon dioxide spinning device simulation method - Google Patents
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 33
- 235000012239 silicon dioxide Nutrition 0.000 title claims abstract description 23
- 238000004088 simulation Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title abstract description 14
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- 238000005259 measurement Methods 0.000 abstract description 3
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- 230000008878 coupling Effects 0.000 abstract 1
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- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 2
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Abstract
Description
技术领域technical field
本发明涉及光学微腔的仿真领域，具体是一种二氧化硅的回音壁微腔的自旋态模拟方法。The invention relates to the field of simulation of optical microcavities, in particular to a spin state simulation method of a silicon dioxide whispering gallery microcavity.
背景技术Background technique
光学微腔是一种能够把光场限制在微米量级区域中的光学谐振腔，由光场存储，光与物质相互作用的发生平台组成。Optical microcavity is an optical resonator capable of confining the optical field in the micrometer-scale region, and consists of the optical field storage and the generation platform for the interaction of light and matter.
对于球状光学微腔，其中光场存在的一个重要模式为回音壁模式，回音壁模式的形成原理是回音壁光学腔中光的全反射，而只有当光在腔中通过的路径形成了闭合路径，并且这个路径的长度是光波长的整数倍时回音壁模式才能稳定存在。回音壁模式中的光并不是完全严格的囚禁于几何体内部，在几何体外部也会存在一部分光，这部分光场被称为倏逝场。当在倏逝场中存在近波长尺度的介质结构时，会改变整个回音壁模式的光程，进而改变其共振频率，这就实现了模式的调控。For the spherical optical microcavity, an important mode of the optical field is the whispering gallery mode. The formation principle of the whispering gallery mode is the total reflection of the light in the whispering gallery optical cavity, and only when the path of the light passing through the cavity forms a closed path , and the whispering gallery mode can only exist stably when the length of this path is an integer multiple of the wavelength of light. The light in the whispering gallery mode is not strictly confined inside the geometry, and there will be some light outside the geometry. This part of the light field is called the evanescent field. When there is a near-wavelength-scale dielectric structure in the evanescent field, the optical path of the entire whispering gallery mode will be changed, and then its resonance frequency will be changed, which realizes the modulation of the mode.
光学非线性效应是指光场的演化规律会随光场强度变化的相应，几乎所有的材料都有非线性效应。二氧化硅回音壁光学微腔中，分子存在非对称性，会诱导其产生非线性效应。当其中光场超过一定强度时二氧化硅微腔中的光场性质会产生质变。Optical nonlinear effect means that the evolution law of the optical field will change with the intensity of the optical field, and almost all materials have nonlinear effects. In the optical microcavity of the silica whispering gallery, the asymmetry of the molecules will induce nonlinear effects. When the optical field exceeds a certain intensity, the properties of the optical field in the silicon dioxide microcavity will change qualitatively.
目前常用的光学的自旋模拟方饭方法是通过强非线性晶体，例如铌酸锂等，使得其中的光场相位产生振荡的方法来模拟自旋。这个过程中必定会涉及光场相位的测量，使得模拟仪器的造价极高，此外铌酸锂等非线性晶体的制备工艺复杂，也极大的提高了造价。At present, the commonly used optical spin simulation method is to simulate the spin by using a strong nonlinear crystal, such as lithium niobate, to make the phase of the optical field oscillate. This process must involve the measurement of the phase of the optical field, which makes the cost of the analog instrument extremely high. In addition, the preparation process of nonlinear crystals such as lithium niobate is complicated, which also greatly increases the cost.
发明内容SUMMARY OF THE INVENTION
本发明直接使用二氧化硅作为基础材料，通过回音壁微腔强局域性的特征来使得二氧化硅的非线性可以被激发，在该非线性下可以产生一个直接测量光场强度的自旋模拟器，具体是一种全二氧化硅的自旋器件模拟方法，不需要制备困难的非线性晶体、不需要复杂的测量器件，基本制备材料二氧化硅是自然界的基础材料，造价低，制备过程中无污染。The present invention directly uses silicon dioxide as the basic material, and the nonlinearity of silicon dioxide can be excited through the strong locality of the whispering gallery microcavity, and a spin that directly measures the intensity of the optical field can be generated under the nonlinearity. The simulator, specifically an all-silicon dioxide spin device simulation method, does not require the preparation of difficult nonlinear crystals or complex measurement devices, and the basic preparation material silicon dioxide is a basic material in nature, with low cost and easy preparation. No pollution in the process.
所述的全二氧化硅的自旋器件模拟方法，具体步骤如下：The described method for simulating a spin device of all silicon dioxide, the specific steps are as follows:
步骤一、搭建二氧化硅的回音壁微腔共振频率调控装置(或者应用光刻技术直接制备相应芯片)；Step 1, build a silicon dioxide whispering gallery microcavity resonance frequency control device (or directly prepare a corresponding chip by applying photolithography technology);
具体包括：激光器通过法兰耦合光纤一端，光纤搭载在核心组件上方，光纤另一端通过法兰连接光探测器，最终光探测器连接示波器。Specifically, the laser is coupled to one end of the optical fiber through the flange, the optical fiber is mounted above the core component, the other end of the optical fiber is connected to the photodetector through the flange, and finally the photodetector is connected to the oscilloscope.
所述的核心组件包括：二氧化硅回音壁腔，光纤/棱镜/波导，激光器，光电探测器。The core components include: silica whispering gallery cavity, fiber/prism/waveguide, laser, and photodetector.
在回音壁腔外侧的上方安装两个伸缩支架，支架上搭载光纤/棱镜/波导，通过调整伸缩支架的长度，进而调整光纤与回音壁腔之间的间距；同时，回音壁腔下方放置在位移器上，通过移动位移器，带动回音壁腔上下移动，从而调整回音壁腔与光纤的间距。Two telescopic brackets are installed above the outer side of the whispering gallery cavity, and the brackets are equipped with optical fibers/prisms/waveguides. By adjusting the length of the telescopic brackets, the distance between the optical fibers and the whispering gallery cavity can be adjusted; On the device, by moving the displacement device, the whispering gallery cavity is driven to move up and down, so as to adjust the distance between the whispering gallery cavity and the optical fiber.
步骤二、通过位移器移动回音壁腔，使回音壁腔位于光纤的倏逝场范围内；Step 2, moving the whispering gallery cavity by the displacer, so that the whispering gallery cavity is located in the evanescent field range of the optical fiber;
此时光纤与回音壁腔的距离为100nm左右。At this time, the distance between the optical fiber and the whispering gallery cavity is about 100 nm.
步骤三、打开激光器，激光以相同的功率从顺时针和逆时针两个输入回音壁腔后，通过扫谱确定回音壁微腔的共振频率；Step 3: Turn on the laser, after the laser is input into the whispering gallery cavity clockwise and counterclockwise with the same power, the resonance frequency of the whispering gallery microcavity is determined by sweeping the spectrum;
步骤四、将激光频率调到共振频率后，逐渐从零增加激光的功率，刚开始时回音壁两个方向输出出的强度相同，继续增加功率。在某个功率下，两个方向的激光功率会产生不同，这个值为腔的模拟阈值h。Step 4. After adjusting the laser frequency to the resonant frequency, gradually increase the power of the laser from zero. At the beginning, the output intensity of the echo wall in both directions is the same, and continue to increase the power. At a certain power, the laser power in the two directions will be different, and this value is the simulated threshold h of the cavity.
步骤五、记录上面阈值h，每次输入相同阈值以上的激光功率，这里以1.1h为例，测试每次系统在两个方向上输出强度的强弱，并将顺时针的强度定义为自旋向上，逆时针的强度定义为自旋向下(反之亦可)；Step 5. Record the above threshold h, and input the laser power above the same threshold each time. Here, take 1.1h as an example to test the strength of the output strength of the system in two directions each time, and define the clockwise strength as the spin Up, counterclockwise intensity is defined as spin down (and vice versa);
对于单次的自旋模拟可以取上面一次操作记录结果。For a single spin simulation, the result of the previous operation can be taken.
对于多次的自旋模拟可取多次(例如100次)的结果，记录分布。相应的分布结果即为被模拟的自旋的分布。For multiple spin simulations, multiple (eg, 100) results may be taken and the distribution recorded. The corresponding distribution result is the distribution of the simulated spins.
本发明的优点在于：The advantages of the present invention are:
一种全二氧化硅的自旋器件模拟方法，使用全二氧化硅器件进行模拟，不需要复杂的晶体生产工艺，无污染；可直接测量光场强度，测试装置结构简单；光信号可以通过光电探测器直接变为电信号，与现有电子器件相容性好。An all-silicon spin device simulation method, the all-silicon device is used for simulation, no complex crystal production process is required, and no pollution; the optical field intensity can be directly measured, and the structure of the test device is simple; the optical signal can pass through the photoelectric The detector is directly converted into an electrical signal, and has good compatibility with existing electronic devices.
附图说明Description of drawings
图1为本发明一种磁光纳米球的回音壁微腔共振频率调制方法的流程图；1 is a flow chart of a method for modulating the resonance frequency of a whispering gallery microcavity of a magneto-optical nanosphere of the present invention;
图2为本发明搭建的磁光纳米球的回音壁微腔共振频率调控装置示意图；Fig. 2 is the schematic diagram of the resonant frequency control device of the whispering gallery microcavity of the magneto-optical nanosphere built by the present invention;
图3为本发明所述共振频率调控装置中的核心组件。FIG. 3 shows the core components of the resonance frequency control device according to the present invention.
具体实施方式Detailed ways
为了便于本领域普通技术人员理解和实施本发明，下面结合附图对本发明作进一步的详细和深入描述。In order to facilitate the understanding and implementation of the present invention by those of ordinary skill in the art, the present invention will be further described in detail and in-depth below with reference to the accompanying drawings.
本发明公开了一种使用二氧化硅的回音壁微腔共振频率调制方法，是非线性诱导下的自旋的光纤仿真方案。具体为：二氧化硅的微盘腔具有接近于通信波长1550纳米的尺度结构，该结构可以产生强的光学局域模式，二氧化硅回音壁光学微腔中的顺时针和逆时针模式具有完全相同的共振频率，使得两个模式可以被同一束激光激发，其共振频率与腔的大小有关。本发明采用的1微米-100微米的二氧化硅微盘腔结构，其中二氧化硅分子由于分子的非完全对称结构的存在，具有弱的非线性；回音壁模式下强的局域场使得即便时在弱非线性下，非线性特性也可以产生影响，这样，可以调节输入的激光强度在回音壁微腔的非线性阈值以上，使得顺时针模式和逆时针模式在强度上产生分裂，利用这种分裂就可以实现自旋这种物理量的硬件仿真。The invention discloses a method for modulating the resonance frequency of a whispering gallery microcavity using silicon dioxide, which is an optical fiber simulation scheme of spin under nonlinear induction. Specifically: the microdisk cavity of silica has a scale structure close to the communication wavelength of 1550 nanometers, which can generate strong optical localized modes, and the clockwise and counterclockwise modes in the optical microcavity of the silica whispering gallery have exactly the same The resonant frequency of , so that the two modes can be excited by the same laser beam, and its resonant frequency is related to the size of the cavity. The silicon dioxide microdisk cavity structure of 1 micron to 100 microns used in the present invention, wherein the silicon dioxide molecules have weak nonlinearity due to the existence of the non-completely symmetrical structure of the molecules; the strong local field in the whispering gallery mode makes the Under weak nonlinearity, nonlinear characteristics can also have an effect. In this way, the input laser intensity can be adjusted to be above the nonlinear threshold of the whispering gallery microcavity, so that the clockwise mode and the counterclockwise mode are split in intensity. Splitting can realize the hardware simulation of spin, a physical quantity.
所述的二氧化硅的微盘腔的自旋仿真器件的实施方法，如图1所示，具体步骤如下：The implementation method of the described silicon dioxide microdisk cavity spin simulation device is shown in Figure 1, and the specific steps are as follows:
步骤一、搭建二氧化硅的回音壁微腔共振频率调控装置(或者应用光刻技术直接制备相应芯片)；Step 1, build a silicon dioxide whispering gallery microcavity resonance frequency control device (or directly prepare a corresponding chip by applying photolithography technology);
具体包括：激光器通过法兰耦合光纤一端，光纤搭载在核心组件上方，光纤另一端通过法兰连接光探测器，最终光探测器连接示波器。Specifically, the laser is coupled to one end of the optical fiber through the flange, the optical fiber is mounted above the core component, the other end of the optical fiber is connected to the photodetector through the flange, and finally the photodetector is connected to the oscilloscope.
所述的核心组件包括：二氧化硅回音壁腔，光纤/棱镜/波导，激光器，光电探测器。The core components include: silica whispering gallery cavity, fiber/prism/waveguide, laser, and photodetector.
在回音壁腔外侧的上方安装两个伸缩支架，支架上搭载光纤/棱镜/波导，通过调整伸缩支架的长度，进而调整光纤与回音壁腔之间的间距；同时，回音壁腔下方放置在位移器上，通过移动位移器，带动回音壁腔上下移动，从而调整回音壁腔与光纤的间距。Two telescopic brackets are installed above the outer side of the whispering gallery cavity, and the brackets are equipped with optical fibers/prisms/waveguides. By adjusting the length of the telescopic brackets, the distance between the optical fibers and the whispering gallery cavity can be adjusted; On the device, by moving the displacement device, the whispering gallery cavity is driven to move up and down, so as to adjust the distance between the whispering gallery cavity and the optical fiber.
所述的回音壁光学微腔在几何上是盘状，球状，微环，微环芯或柱状结构，其材料采用二氧化硅。The whispering gallery optical microcavity is geometrically disc-shaped, spherical, micro-ring, micro-ring core or columnar structure, and its material is silicon dioxide.
步骤二、通过位移器移动回音壁腔，使回音壁腔位于光纤的倏逝场范围内；Step 2, moving the whispering gallery cavity by the displacer, so that the whispering gallery cavity is located in the evanescent field range of the optical fiber;
此时光纤与回音壁腔的距离为100nm左右。At this time, the distance between the optical fiber and the whispering gallery cavity is about 100 nm.
步骤三、打开激光器，激光以相同的功率从顺时针和逆时针两个输入回音壁腔后，通过扫谱确定回音壁微腔的共振频率；Step 3: Turn on the laser, after the laser is input into the whispering gallery cavity clockwise and counterclockwise with the same power, the resonance frequency of the whispering gallery microcavity is determined by sweeping the spectrum;
步骤四、将激光频率调到共振频率后，逐渐从零增加激光的功率，刚开始时回音壁两个方向输出出的强度相同，继续增加功率。在某个功率下，两个方向的激光功率会产生不同，这个值为腔的模拟阈值h。Step 4. After adjusting the laser frequency to the resonant frequency, gradually increase the power of the laser from zero. At the beginning, the output intensity of the echo wall in both directions is the same, and continue to increase the power. At a certain power, the laser power in the two directions will be different, and this value is the simulated threshold h of the cavity.
步骤五、记录上面阈值h，每次输入相同阈值以上的激光功率，这里以1.1h为例，测试每次系统在两个方向上输出强度的强弱，并将顺时针的强度定义为自旋向上，逆时针的强度定义为自旋向下(反之亦可)；Step 5. Record the above threshold h, and input the laser power above the same threshold each time. Here, take 1.1h as an example to test the strength of the output strength of the system in two directions each time, and define the clockwise strength as the spin Up, counterclockwise intensity is defined as spin down (and vice versa);
对于单次的自旋模拟可以取上面一次操作记录结果。For a single spin simulation, the result of the previous operation can be taken.
对于多次的自旋模拟可取多次(例如100次)的结果，记录分布。相应的分布结果即为被模拟的自旋的分布。For multiple spin simulations, multiple (eg, 100) results may be taken and the distribution recorded. The corresponding distribution result is the distribution of the simulated spins.
实施例Example
选用的激光器为标准的1550nm通信光源，功率为0.3mw，回音壁腔为品质因子为1×108的二氧化硅盘状腔。The selected laser is a standard 1550nm communication light source with a power of 0.3mw, and the whispering gallery cavity is a silica disc cavity with a quality factor of 1×10 8 .
激光器的输入光耦合进二氧化硅盘状腔，调节光纤-盘的贴合区域，在示波器扫谱观察到明显的吸收谷，锁定扫谱范围为吸收谷附近；将激光的频率调制至吸收谷的区域。The input light of the laser is coupled into the silica disk cavity, and the bonding area between the fiber and the disk is adjusted. The obvious absorption valley is observed in the sweep spectrum of the oscilloscope, and the sweep spectrum range is locked to the vicinity of the absorption valley; the frequency of the laser is modulated to the absorption valley Area.
逐渐增强激光强度至0.3mw，记录微腔两个输出端口处的输出激光强度，将强的模式的激光强度记录为1，弱的激光强度记录为0，并将顺时针模式的强度带入上对角元处，逆时针模式的强度带入下对角元处，所得即为被模拟的自旋矩阵。Gradually increase the laser intensity to 0.3mw, record the output laser intensity at the two output ports of the microcavity, record the laser intensity of the strong mode as 1, the weak laser intensity as 0, and bring the intensity of the clockwise mode into the upper At the diagonal element, the intensity of the counterclockwise mode is brought into the lower diagonal element, and the result is the simulated spin matrix.
最后需要注意的是，公布实施例的目的在于帮助进一步理解本发明，但是本领域的技术人员可以理解：在不脱离本发明及所附的权利要求的精神和范围内，各种替换和修改都是可能的。因此，本发明不应局限于实施例所公开的内容，本发明要求保护的范围以权利要求书界定的范围为准。Finally, it should be noted that the purpose of publishing the embodiments is to help further understanding of the present invention, but those skilled in the art can understand that various replacements and modifications can be made without departing from the spirit and scope of the present invention and the appended claims. It is possible. Therefore, the present invention should not be limited to the contents disclosed in the embodiments, and the scope of protection of the present invention shall be subject to the scope defined by the claims.
Claims (5)
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