Investigation of oxide nanophotonic devices

该项目由电子、通信和网络系统(ECCS)的电子、光子学和磁性器件计划(EPMD)和材料研究(DMR)的电子和光子材料计划(EPM)联合资助。技术：在这项研究中，非线性光子晶体(PHC)波导器件正在开发中。特别令人感兴趣的是亚太赫兹PHC电光调制器(EOM)。这项工作建立在我们最近演示的带宽大于50 GHz的非线性PHC EOMS的基础上。基于最近的器件模拟，人们正在设计和制造用于亚太赫兹频率和低电压(0.5V-mm)工作的非线性PHC波导调制器。为了在低电压和宽带宽下工作，需要具有大电光系数的铁电BaTiO_3。为了最大限度地减少由于微波损耗造成的带宽限制，采用了PHC和慢光概念。器件的制造采用气相外延沉积，以及传统的光刻和聚焦离子束球磨。通过建模和测试，确定了微波损耗、光/微波速度失配和器件长度等限制带宽的因素。这些PC设备与单一平台的芯片级集成正在利用硅上的BaTiO3外延进行追求。非技术性：通过使用具有较大光学非线性的非线性光子晶体，与传统的电光器件相比，有望在带宽、工作电压和尺寸方面有显著改善。预计这些器件应该具有良好的光稳定性和热稳定性。更广泛的影响是可能实现亚太赫兹带宽、亚毫米尺寸的光学器件和用于光通信和信息处理的光子电路。该项目将包括培训纳米光子学领域的本科生和研究生，以及指导K-12学生。通过工业和政府实验室对博士生的实习进行推广。

This project is jointly funded by the Electronics, Photonics, and Magnetic Devices Program (EPMD) in the Division of Electrical, Communications and Cyber Systems (ECCS) and the Electronic and Photonic Materials Program (EPM) in the Division of Materials Research (DMR).TECHNICAL: In this research non-linear photonic crystal (PhC) waveguide devices are being developed. Of particular interest are sub-terahertz PhC electro-optic modulators (EOM). This work builds on our recent demonstration of non-linear PhC EOMs with a bandwidth greater than 50 GHz. Based on recent device simulations non-linear PhC waveguide modulators are being designed and fabricated for sub-terahertz frequency and low-voltage (0.5V-mm) operation. To operate at low voltage, and wide bandwidth, ferroelectric BaTiO3 with large electro-optic coefficients are required. To minimize bandwidth limitations due to microwave losses, PhC and slow light concepts are utilized. Devices are fabricated using vapor phase epitaxial deposition, and both conventional photolithography and focused ion beam milling. Factors limiting bandwidth including microwave loss, optical/microwave velocity mismatch and device length are determined through modeling and testing. Chip-scale integration of these PC devices with a single platform is being pursued using epitaxial BaTiO3 on Si. NON-TECHNICAL: By using non-linear photonic crystals with large optical non-linearities, significant improvements in bandwidth, operating voltage, and size are expected compared to conventional electro-optic devices. It is anticipated that these devices should have excellent photo and thermal stability. The broader impact is the potential realization of sub-terahertz bandwidth, sub-millimeter size optical devices and photonic circuits for optical communications and information processing. The project will involve training of undergraduates, and graduate students in the area of nanophotonics as well as mentoring K-12 students. Outreach through industrial and government lab internships of doctoral students is involved.