Characterizing enhanced nonlinear optical responses in the mid-infrared spectrum

表征中红外光谱中增强的非线性光学响应

• 批准号: RTI-2020-00736
• 负责人: Boyd, Robert
• 金额: $ 9.85万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693475
• 关键词: Characterizing; enhanced; nonlinear; optical; responses

This proposal requests funding for sensitive optical detectors in the mid-infrared (2 to 20 um) spectral range, enabling measurements of strongly enhanced nonlinear optical responses of various dielectric materials as well as the spatial, spectral and temporal tailoring of coherent thermal emission from films and time-varying metasurfaces. Specifically, funds are requested to purchase optical power detectors with associated electronics for measurements of giant ultrafast nonlinear optical responses and a sophisticated spectrometry system for detecting the thermal and spectral fingerprints of samples in the mid-IR. This necessary detection equipment for mid-IR will enable the applicants and numerous HQP to bring their nonlinear optics expertise established in the visible and near-IR regimes (400-2000 nm) into the so far largely unexplored mid-IR spectrum, where we predict light-matter interactions in phonon-mediated resonant solid state materials will reveal giant nonlinear optical enhancements, and create opportunities for thermal emission engineering.***Research enabled by this equipment is motivated by four of our recent findings: 1)nonlinear optical response of materials are greatly enhanced at near-zero permittivities due to inherent plasmonic resonances, which we have shown in near-IR; 2)prediction that the nonlinear optical properties of phononic solid state materials in the mid-IR can greatly exceed those of plasmonic ones; 3)near-zero permittivity materials can dynamically control the resonances of plasmonic and dielectric scatterers, which we have shown in near-IR; and 4)the theoretical prediction that the spatiotemporal coherence and emissivity of a blackbody can be enhanced or suppressed using near-zero permittivity. However, all experimental work has been confined to the near-IR spectrum due to the complete lack, either at uOttawa or in the NRC Ottawa facilities, of available measurement devices that are compatible with a femtosecond laser system with intense optical pulses in the mid-IR.***These specialized mid-IR optical detection systems are crucial to the expansion of the applicants' NSERC-funded research on nonlinear optics and metasurfaces from the near-IR to the mid-IR, where technological limitations have thus far prevented nonlinear optics research. The applicants hope to reveal that these distinct nonlinearities stemming from phononic resonances are even stronger than those observed at plasmonic resonances, thus providing insights into both. Furthermore, understanding large nonlinear responses based on this distinct physical phenomena could leading to the development of new coherent sources, absorbers, and signal processing devices with the potential of finding applications in thermal emission engineering of photovoltaics, optical remote detection of environmental hazards and pollutants, active-control thermal and optical camouflage and perhaps even achieving thermal emission engineering that could surpass the blackbody limit.

该提案要求在中红外（2至20 um）光谱范围内为敏感的光学探测器提供资金，从而实现了各种介电材料的强烈增强的非线性光学响应的​​测量，以及从膜和时变近近近面积的相干热发射的空间，光谱和时间量身定制。具体而言，要求资金购买具有相关电子设备的光功率探测器，以测量巨型超快非线性光学响应和一个复杂的光谱系统，用于检测MID-IR中样品的热和光谱指纹。这种对MID-IR的必要检测设备将使申请人和许多HQP能够将其非线性光学专业知识带入到迄今为止迄今为止未开发的中IR频谱中，在可见的和近红外（400-2000 nm）中建立的非线性光学专业知识（400-2000 nm），我们可以预测，在其中预测声音介导的固体材料中的光线互动将启用巨大的启用良好的启示式启示，并创建了巨大的启用机能，并创建了巨大的启用机能，并创建了巨大的启用机能，并在其中创建了巨大的启用。该设备是由我们最近的四个发现激发的：1）由于固有的等离子共振，我们在近IR中显示了材料的非线性光学响应大大增强。 2）预测中IR中语音固态材料的非线性光学特性大大超过了等离子的固态材料； 3）接近零的介电常数材料可以动态控制等离子和介电散射器的共振，我们已经在近IR中显示； 4）理论预测可以使用接近零介电常数来增强或抑制黑体的时空相干性和发射率。但是，由于在乌塔瓦（Uottawa）或NRC Ottawa设施中完全缺乏，所有实验工作都局限于近红外观察者，其可用的测量设备与与femtsecond激光系统相吻合的可用测量设备，具有强烈的光学脉冲，在MID-IR中具有强烈的光学脉冲。光学和元信息从近IR到MID-IR，到目前为止，技术限制阻止了非线性光学研究。申请人希望透露，这些独特的非线性来自语音共振甚至比等离子共振的那些具有强度的强度，从而提供了对两者的见解。此外，基于这种不同的物理现象理解大型非线性响应可能会导致开发新的相干来源，吸收剂和信号处理设备，并可能在光伏的热发射工程中找到应用，光电远程远程检测，环境危害和污染物的光电危害，激发摄像机的限制性和效率可以促进热量的限制性，并可以实现热量的限制。