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Compact Phase-Modulated Photonic Structures for On-Chip Multiband Spectroscopy

用于片上多波段光谱的紧凑型相位调制光子结构

基本信息

批准号：
2015700
负责人：
Luca Dal Negro
金额：
$ 38万
依托单位：
Trustees of Boston University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-09-01 至 2023-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2015700&HistoricalAwards=false
关键词：
Compact Phase Modulated Photonic Structures

项目摘要

Due to the rapid developments of highly-integrated photonics and quantum communication technologies as well as the recent advancements of high-resolution medical imaging techniques, there is currently a compelling need for miniaturized and scalable optical elements that enable simultaneous light focusing and directional control over different spectral bands. Responding to these challenges, this project advances the understanding of optical devices that combine multiple functionalities on the nanoscale. The research team utilizes experimental and computational approaches to help develop novel materials and structures that enable controllable light focusing responses with reduced losses and enhanced efficiency for use in next generation of power-efficient nanophotonics devices, such as on-chip spectrometers, optical sensors, and miniaturized imaging systems that operate over multiple and spectral regions. The project supports one graduate student and encourages the involvement of undergraduate students in the research through a vibrant outreach program aimed at introducing fundamental concepts of optical science and engineering in their academic curricula in partnership with practical laboratory demonstrations and research activities through summer programs at Boston University. An important component of this outreach plan is to attract underrepresented minorities to a career in optical engineering through participation in the project. Finally, the outreach involves the development of a focused teaching module addressing the emerging field of Metaphotonics that will be offered to students (graduate and undergraduate) and practitioners both in industry and academia as part of the photonics outreach programs at Boston University.The primary goal of this proposal is to combine favorable aspects from both meta-optics and diffractive optics technologies in order to design, fabricate, and experimentally characterize high-performance, ultra-compact novel diffractive devices with spatially-modulated phase profiles based on high-index transparent materials and scalable multi-level fabrication. In particular, the researchers will focus on two closely related novel photonic structures: (i) single-element, ultra-compact micro- spectrometers based on achromatic axilenses with engineered phase modulation, and (ii) multi-spectral axilens-based focusing devices that achieve simultaneous focusing of radiation over selected spectral bands. The goals will be accomplished by a comprehensive integration of rigorous Rayleigh-Sommerfeld diffraction theory, device-level Finite Element Method (FEM) numerical design, materials fabrication, and experimental characterization of optical devices with integrated imaging and spectroscopic functionalities across a wide spectral range. While using silicon (Si) and titanium dioxide (TiO2) transparent dielectrics for the visible and near-infrared (NIR) spectral range, the research concepts, methods and design approach can naturally be extended to any wavelength of interest and dielectric materials platforms. The intellectual merit of the proposed research program relies on the development of novel and more powerful avenues for cost-effective, miniaturized, phase-engineered devices that are polarization insensitive, work over a large range of incidence angles, and combine highly-efficient focusing and grating responses that, in addition to optical spectroscopy, also find applications to multi- spectral optical detection, quantum information sources, and on-chip sensing. This project enables a substantial broader impact as it provides the foundation for the next generation of ultra-compact spectroscopic phase-modulated devices for optical imaging, sensing, and spectroscopy.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

由于高度集成的光子学和量子通信技术的快速发展以及高分辨率医学成像技术的最新进展，目前迫切需要小型化和可扩展的光学元件，这些光学元件能够在不同的光谱带上同时进行光聚焦和方向控制。为了应对这些挑战，该项目推进了对纳米尺度上结合联合收割机多种功能的光学器件的理解。该研究小组利用实验和计算方法来帮助开发新型材料和结构，使可控的光聚焦响应具有减少的损失和提高的效率，用于下一代节能纳米光子器件，如片上光谱仪，光学传感器和小型化成像系统，在多个光谱区域工作。该项目支持一名研究生，并鼓励本科生通过一个充满活力的外展计划参与研究，旨在通过波士顿大学的暑期课程，与实际实验室演示和研究活动合作，在他们的学术课程中引入光学科学和工程的基本概念。这一推广计划的一个重要组成部分是通过参与该项目吸引代表性不足的少数群体从事光学工程职业。最后，推广涉及一个重点教学模块的发展，解决将提供给学生的新兴领域的元光子学（研究生和本科生）和从业者在工业界和学术界的光子学推广计划的一部分，在波士顿大学。该建议的主要目标是联合收割机有利的方面，从元光学和衍射光学技术，以设计，制造，并且实验性地表征了基于高折射率透明材料和可扩展的多级制造的具有空间调制相位分布的高性能、超紧凑的新型衍射器件。特别是，研究人员将专注于两种密切相关的新型光子结构：（i）基于具有工程相位调制的消色差axilenses的单元件，超紧凑型微型光谱仪，以及（ii）基于多光谱axilenses的聚焦设备，可在选定的光谱带上实现辐射的同时聚焦。这些目标将通过全面整合严格的瑞利-索末菲衍射理论、器件级有限元法（FEM）数值设计、材料制造以及光学器件的实验表征来实现，这些光学器件具有广泛的光谱范围内的集成成像和光谱功能。在使用硅（Si）和二氧化钛（TiO 2）透明陶瓷用于可见光和近红外（NIR）光谱范围的同时，研究概念、方法和设计方法自然可以扩展到任何感兴趣的波长和介电材料平台。所提出的研究计划的智力价值依赖于开发新的和更强大的途径，用于具有成本效益的小型化相位工程设备，这些设备是偏振不敏感的，在大范围的入射角下工作，并联合收割机了高效的聚焦和光栅响应，除了光谱学之外，还应用于多光谱光学检测，量子信息源，和片上传感。该项目为下一代光学成像、传感和光谱学用超紧凑型光谱相位调制器件奠定了基础，因此产生了广泛的影响。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响评审标准进行评估，被认为值得支持。