On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections.
On-chip beam rotators, adiabatic mode converters, and waveplates through low-loss waveguides with variable cross-sections.
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DOI：
10.1038/s41377-022-00907-4
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发表时间：
2022-07-07
影响因子：
19.4
通讯作者：
Booth, Martin J.
中科院分区：
文献类型：
--
作者：
Sun, Bangshan;Morozko, Fyodor;Salter, Patrick S.;Moser, Simon;Pong, Zhikai;Patel, Raj B.;Walmsley, Ian A.;Wang, Mohan;Hazan, Adir;Barre, Nicolas;Jesacher, Alexander;Fells, Julian;He, Chao;Katiyi, Aviad;Tian, Zhen-Nan;Karabchevsky, Alina;Booth, Martin J.
光子集成电路将大大受益于以高精度和低损耗任意控制波导横截面的能力，以便在操纵传播光方面提供更大的自由度。在这里，我们报告了一种飞秒激光写入光纤兼容玻璃波导的新方法，即球形相诱导多芯波导（SPIM-WG），它通过三维片上光控制解决了这一具有挑战性的任务。在高扫描速度的加热状态下制造，仍然可以沿着波导实现横截面的精确变形，并且在水平和垂直横向方向上的形状和尺寸都可以以高分辨率精细控制。我们观察到这些波导具有 0.017 的高折射率对比度、0.14dB/cm 的低传播损耗以及从单模光纤耦合的 0.19dB 的极低耦合损耗。 SPIM-WG 器件很容易制造，能够通过不同的角度执行片上光束旋转，或操纵目标波长的传播光的偏振状态。我们还演示了 SPIM-WG 模式转换器，它可以在对称和非对称非均匀模式之间提供高效率的任意绝热模式转换；示例包括来自 ppKTP（周期性极化磷酸氧钛钾）波导的圆形、椭圆形模式和非对称模式，这些波导通常应用于频率转换和量子光源。这些波导和设备在光学玻璃内部创建，能够在从可见光到红外波长的超宽带范围内运行。与光纤的兼容性也为封装光子集成电路铺平了道路，该电路通常需要输入和输出光纤连接。新技术能够快速生产基于波导（SPIM-WG）的高性能光学器件，具有极低的损耗、精确组织的折射率、任意可变的横截面和高耦合效率。
Photonics integrated circuitry would benefit considerably from the ability to arbitrarily control waveguide cross-sections with high precision and low loss, in order to provide more degrees of freedom in manipulating propagating light. Here, we report a new method for femtosecond laser writing of optical-fiber-compatible glass waveguides, namely spherical phase-induced multicore waveguide (SPIM-WG), which addresses this challenging task with three-dimensional on-chip light control. Fabricating in the heating regime with high scanning speed, precise deformation of cross-sections is still achievable along the waveguide, with shapes and sizes finely controllable of high resolution in both horizontal and vertical transversal directions. We observed that these waveguides have high refractive index contrast of 0.017, low propagation loss of 0.14 dB/cm, and very low coupling loss of 0.19 dB coupled from a single-mode fiber. SPIM-WG devices were easily fabricated that were able to perform on-chip beam rotation through varying angles, or manipulate the polarization state of propagating light for target wavelengths. We also demonstrated SPIM-WG mode converters that provide arbitrary adiabatic mode conversion with high efficiency between symmetric and asymmetric nonuniform modes; examples include circular, elliptical modes, and asymmetric modes from ppKTP (periodically poled potassium titanyl phosphate) waveguides which are generally applied in frequency conversion and quantum light sources. Created inside optical glass, these waveguides and devices have the capability to operate across ultra-broad bands from visible to infrared wavelengths. The compatibility with optical fiber also paves the way toward packaged photonic integrated circuitry, which usually needs input and output fiber connections. A new technology enables fast production of waveguide (SPIM-WG) based high performance optical devices with very low loss, precisely organized refractive index, arbitrarily variable cross-sections and high coupling efficiency.
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影响因子：
16.6
作者：
Feng LT;Zhang M;Zhou ZY;Li M;Xiong X;Yu L;Shi BS;Guo GP;Dai DX;Ren XF;Guo GC
通讯作者：
Guo GC
DOI：
10.1007/s00339-019-2635-4
发表时间：
2019-05-01
影响因子：
2.7
作者：
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通讯作者：
Salter, P. S.
影响因子：
8.6
作者：
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通讯作者：
Silberhorn, Christine
影响因子：
3.8
作者：
Eigner, Christof;Santandrea, Matteo;Silberhorn, Christine
通讯作者：
Silberhorn, Christine
影响因子：
7.6
作者：
Fu, Yunfei;Ye, Tong;Chu, Tao
通讯作者：
Chu, Tao