Photonic Hook Plasmons: A New Curved Surface Wave

Abstract

Today the surface plasmon-polariton (SPP) waves propagating along the curve trajectory are the only plasmonic beams of the Airy family. Herein, a new class of curved surface plasmon wave, the photonic hook plasmon (PHP), is introduced. The PHP is created using the in-plane focusing of the SPP wave through an asymmetric dielectric particle. This is fundamentally simpler than the generation of the SPP Airy-family beams. The PHP propagates along a wavelength-scaled curved trajectory with radius less than the SPP wavelength, which represents the smallest radius of curvature ever recorded for an SPP beam, and can exist despite the strong energy dissipation at metal surface.

Recent Trends in Optical Manipulation Inspired by Mesoscale Photonics and Diffraction Optics

“…However, the addition of the wedge creates the asymmetric structure that curves the light upon exiting the cuboid to a degree dependent on the wedge angle. Wavefront analysis of such asymmetric mesoscale structure reveals that the unequal phase of the transmitted plane wave results in the irregularly concave deformation of the wavefront inside the structure that then leads to creation of the PH [33][34][35][36][37][38], which can be more easily visualized as a light beam with astigmatism on the macro scale. A distinctive feature of the PH are: the radius of curvature of PH is the fraction of illumination wavelength and although the curved profile evokes a similarity with Airy beams, in contrast to Airy beams there are no curved side lobes [34][35][36][37], where in the caustic from one side the sidelobes almost parallel to each other.…”

“…3). Recent studies have investigated the generation of wide families of photonic hook beams, bringing many future opportunities to this fast-moving area including optics [33][34][35]37], THz [36], surface plasmon photonics (SPP) [38], acoustics [39] and have boosted the development of mesoscale photonics providing cuttingedge abilities in particle manipulation on subwavelength scales.…”

All-dielectric concentration of electromagnetic fields at the nanoscale: the role of photonic nanojets

“…Although the term "PNJ" was originally coined for the concentrated beam regarding microspheres, it has been generalized immensely to also represent the squeezed eld on the shadow surface of non-spherical objects, such as cuboids, triangles, gratings, and nanober assemblies. [32][33][34][35] Such a generalization facilitates the explanation and description of the light-matter interaction for non-spherical objects in the PNJ language. The emergence of novel light sources including frequency combs, 36 ultra-fast lasers, 37 super-continuum sources, 38 and quantum atom-ber photonics, 39 provide a brandnew dimension for the PNJ generators (microsphere and its derivatives) to manipulate light-matter interaction in extreme environments.…”

Терагерцовый Микроскоп На Основе Эффекта Твердотельной Иммерсии Для Визуализации Биологических Тканей-=sup=-*-=/Sup=-

“…DOI: 10.21883/OS.2019.05.47665. [14][15][16][17][18][19] Введение С конца ХХ века наблюдается значительное развитие методов терагерцовой (ТГц) визуализации [1]. Среди приложений ТГц изображающих систем особый интерес представляет медицинская диагностика [2,3] и, в частности, дифференциация здоровых тканей и злокачественных новообразований различной нозологии и локали-зации с использованием ТГц имиджинга на основе эндогенных (естественных) маркеров [4][5][6].…”

“…Другая группа методов построения высокоразрешающих ТГц изображающих систем основана на эффекте локализации электромагнитного поля позади диэлектрических объектов различной геометрии [13]. В частности, для достижения субволнового разрешения могут быть использованы субволновые каустики ТГц излучения, формируемые позади мезомасштабных диэлектрических или металлических частиц (например, сфер, кубиков или асимметричных частиц) -так называемые " тераструи" (tera-jets) [14][15][16][17][18]. Так, в работах [19,20] достигнуто пространственное разрешение до 0.5λ, при этом использовались мезоразмерные частицы, изготовленные как из однородного материала, так и из метаматериалов с искусственно подобранными диэлектрическими свойствами [21].…”