Synchronized conductivity modulation to realize broadband lossless magnetic-free non-reciprocity.
Synchronized conductivity modulation to realize broadband lossless magnetic-free non-reciprocity.
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DOI：
10.1038/s41467-017-00798-9
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发表时间：
2017-10-06
影响因子：
16.6
通讯作者：
Krishnaswamy H
中科院分区：
文献类型：
--
作者：
Dinc T;Tymchenko M;Nagulu A;Sounas D;Alu A;Krishnaswamy H
最近的研究探索了介电常数的时空调制，以与集成电路制造兼容的方式打破洛伦兹互易性。然而，介电常数调制本质上很弱，并且伴随着由于载流子注入而产生的损耗，特别是在较高频率下，导致大的插入损耗、尺寸和/或窄的工作带宽。在这里，我们表明，集成电子电路中吸收的存在可能与我们的优势相反，用于实现新一代无磁不可逆元件。我们利用半导体的电导率提供比介电常数大几个数量级的调制指数这一事实。虽然与静态系统中的损耗直接相关，但我们表明，正确同步的电导率调制可以实现无损耗、紧凑且极宽带非互易性。我们应用这些概念来获得从隔离到回转和循环的广泛响应，并通过实现完全集成在互补金属氧化物半导体技术中的毫米波 (25GHz) 循环器来验证我们的发现。通过折射率调制实现的光学非互易性可能有其挑战和局限性。在这里，丁克等人。引入基于电导率同步时空调制的非互易概念，以实现不同类型的非互易功能。
Recent research has explored the spatiotemporal modulation of permittivity to break Lorentz reciprocity in a manner compatible with integrated-circuit fabrication. However, permittivity modulation is inherently weak and accompanied by loss due to carrier injection, particularly at higher frequencies, resulting in large insertion loss, size, and/or narrow operation bandwidths. Here, we show that the presence of absorption in an integrated electronic circuit may be counter-intuitively used to our advantage to realize a new generation of magnet-free non-reciprocal components. We exploit the fact that conductivity in semiconductors provides a modulation index several orders of magnitude larger than permittivity. While directly associated with loss in static systems, we show that properly synchronized conductivity modulation enables loss-free, compact and extremely broadband non-reciprocity. We apply these concepts to obtain a wide range of responses, from isolation to gyration and circulation, and verify our findings by realizing a millimeter-wave (25 GHz) circulator fully integrated in complementary metal-oxide-semiconductor technology. Optical non-reciprocity achieved through refractive index modulation can have its challenges and limitations. Here, Dinc et al. introduce the concept of non-reciprocity based on synchronized spatio-temporal modulation of conductivity to achieve different types of non-reciprocal functionality.
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影响因子：
16.6
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.1109/tmtt.2014.2347935
发表时间：
2014-10-01
影响因子：
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通讯作者：
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