Inverse-Designed Metaphotonics for Hypersensitive Detection

IF 4.8 Q2 NANOSCIENCE & NANOTECHNOLOGY ACS Nanoscience Au Pub Date : 2022-07-25 DOI:10.1021/acsnanoscienceau.2c00009
Maxim Elizarov, Yuri S. Kivshar and Andrea Fratalocchi*, 
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引用次数: 3

Abstract

Controlling the flow of broadband electromagnetic energy at the nanoscale remains a critical challenge in optoelectronics. Surface plasmon polaritons (or plasmons) provide subwavelength localization of light but are affected by significant losses. On the contrary, dielectrics lack a sufficiently robust response in the visible to trap photons similar to metallic structures. Overcoming these limitations appears elusive. Here we demonstrate that addressing this problem is possible if we employ a novel approach based on suitably deformed reflective metaphotonic structures. The complex geometrical shape engineered in these reflectors emulates nondispersive index responses, which can be inverse-designed following arbitrary form factors. We discuss the realization of essential components such as resonators with an ultrahigh refractive index of n = 100 in diverse profiles. These structures support the localization of light in the form of bound states in the continuum (BIC), fully localized in air, in a platform in which all refractive index regions are physically accessible. We discuss our approach to sensing applications, designing a class of sensors where the analyte directly contacts areas of ultrahigh refractive index. Leveraging this feature, we report an optical sensor with sensitivity two times higher than the closest competitor with a similar micrometer footprint. Inversely designed reflective metaphotonics offers a flexible technology for controlling broadband light, supporting optoelectronics’ integration with large bandwidths in circuitry with miniaturized footprints.

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超敏检测的反设计变形学
在纳米尺度上控制宽带电磁能量的流动仍然是光电子学中的一个关键挑战。表面等离子激元(或等离子激元)提供光的亚波长定位,但受到显著损失的影响。相反,电介质在可见光中缺乏足够强大的响应,无法像金属结构那样捕获光子。克服这些限制似乎很难。在这里,我们证明,解决这个问题是可能的,如果我们采用一种新的方法,基于适当变形的反射变光子结构。这些反射器的复杂几何形状模拟了非色散折射率响应,可以根据任意形状因素进行反设计。我们讨论了在不同剖面中实现具有n = 100超高折射率的谐振器等基本元件。这些结构支持光在连续体(BIC)中以束缚态的形式定位,在空气中完全定位,在所有折射率区域都可以物理访问的平台中。我们讨论了传感应用的方法,设计了一类被分析物直接接触超高折射率区域的传感器。利用这一特性,我们报告了一种光学传感器,其灵敏度比最接近的竞争对手高两倍,具有相似的微米足迹。反向设计的反射变光子学为控制宽带光提供了一种灵活的技术,支持光电子技术与小型化电路中的大带宽集成。
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来源期刊
ACS Nanoscience Au
ACS Nanoscience Au 材料科学、纳米科学-
CiteScore
4.20
自引率
0.00%
发文量
0
期刊介绍: ACS Nanoscience Au is an open access journal that publishes original fundamental and applied research on nanoscience and nanotechnology research at the interfaces of chemistry biology medicine materials science physics and engineering.The journal publishes short letters comprehensive articles reviews and perspectives on all aspects of nanoscience and nanotechnology:synthesis assembly characterization theory modeling and simulation of nanostructures nanomaterials and nanoscale devicesdesign fabrication and applications of organic inorganic polymer hybrid and biological nanostructuresexperimental and theoretical studies of nanoscale chemical physical and biological phenomenamethods and tools for nanoscience and nanotechnologyself- and directed-assemblyzero- one- and two-dimensional materialsnanostructures and nano-engineered devices with advanced performancenanobiotechnologynanomedicine and nanotoxicologyACS Nanoscience Au also publishes original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials engineering physics bioscience and chemistry into important applications of nanomaterials.
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