Electrically activated spin-controlled orbital angular momentum multiplexer

Ruffato, Gianluca; Brasselet, Étienne; Massari, Michele; Romanato, Filippo

doi:10.1063/1.5030844

Cited by 8 publications

(3 citation statements)

References 40 publications

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“…The metasurface paradigm 26 inflamed the evolution of SPPs from 3D surface relief structures to their 2D counterparts, the so-called q -plates. Instead of modulating the optical path with a spatially-variant thickness, q -plates implement an artificial material with fixed thickness and spatially-variant form birefringence, by exploiting the inherent anisotropy of liquid crystals 27 – 30 or structuring matter in the form of 2D nano-resonators 31 , 32 or subwavelength gratings 33 using the well-established techniques of semiconductor manufacturing. The imparted phase is equal to twice the local angle formed by the extraordinary axis, while its sign depends on the handedness of the circular-polarization state in input 34 .…”

Section: Introductionmentioning

confidence: 99%

Dual-functional metalenses for the polarization-controlled generation of focalized vector beams in the telecom infrared

Vogliardi

Ruffato

Zilio

et al. 2023

Sci Rep

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The availability of static tiny optical devices is mandatory to reduce the complexity of optical paths that typically use dynamic optical components and/or many standard elements for the generation of complex states of light, leading to unprecedented levels of miniaturization and compactness of optical systems. In particular, the design of flat and integrated optical elements capable of multiple vector beams generation with high resolution in the visible and infrared range is very attractive in many fields, from life science to information and communication technology. In this regard, we propose dual-functional transmission dielectric metalenses that act simultaneously on the dynamic and geometric phases in order to manipulate independently right-handed and left-handed circularly polarized states of light and generate focused vector beams in a compact and versatile way. In the specific, starting from the mathematical fundamentals for the compact generation of vector beams using dual-functional optical elements, we provide the numerical algorithms for the computation of metaoptics and apply those techniques to the design and fabrication of silicon metalenses which are able to generate and focus different vector beams in the telecom infrared, depending on the linear polarization state in input. This approach provides new integrated optics for applications in the fields of high-resolution microscopy, optical manipulation, and optical communications, both in the classical and single-photon regimes.

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Section: Introductionmentioning

confidence: 99%

Dual-functional metalenses for the polarization-controlled generation of focalized vector beams in the telecom infrared

Vogliardi

Ruffato

Zilio

et al. 2023

Sci Rep

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“…The imparted phase, having a geometric nature, is equal to twice the local angle formed by the extraordinary axis, with a sign depending on the handedness of the circular polarization in input [20]. That is achieved by structuring the optical element at the subwavelength scale in the form of a spatially-variant half-wave plate, by exploiting the inherent anisotropy of liquid crystals [21,22], or using properly-oriented digital gratings [23] or dielectric resonators [24], the so-called metaunits, to induce an effective form birefringence. Moreover, moving from 3D sculptured surfaces to 2D digital optics, metasurfaces open to the exploitation of semiconductor manufacturing [25], achieving the actual merging between optics and silicon photonics [26].…”

Section: Introductionmentioning

confidence: 99%

Design of Dual-Functional Metaoptics for the Spin-Controlled Generation of Orbital Angular Momentum Beams

2022

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The capability of multiple orbital angular momentum (OAM) modes generation with high resolution and diversified functionalities in the visible and near-infrared regime is challenging for flat and integrated optical devices. Additionally, having a static tiny optical device capable of generating multiple structured spots in space reduces the complexity of optical paths that typically use dynamic optical components and/or many standard elements, leading to unprecedented miniaturization and compactness of optical systems. In this regard, we propose dual-functional transmission dielectric metalenses based on a set of Pancharatnam-Berry phase meta-atoms with different cross-sections, for the combined manipulation of the dynamic and geometric phases. In particular, we present and describe the numerical algorithms for the computation of dual-functional metaoptics and we apply those techniques to the design of optical elements which are able to generate and focus different OAM modes at distinct points in space. In the specific, the designed elements enable the independent or simultaneous manipulation of right-handed and left-handed circularly polarized waves, by acting on the helicity of the input beam to enable or disable a specific optical operation. The theoretical proof-of-concept results highlight the capability of the designed metalenses to generate multiple high-resolution focused OAM modes at different points in space by exploiting the polarization of the incident beam as a degree of freedom, thus providing new integrated optics for applications in the fields of high-resolution microscopy, optical manipulation, and optical communications, both in the classical and single-photon regimes.

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“…In the telecom field, the potentially unbounded state space provided by this even-unexploited degree of freedom offers a promising solution to increase the information capacity of optical networks 19 , both for free space 20 and optical fiber 21 propagation. At present, it is urgent to further develop novel devices that can dynamically reconfigure and switch between distinct OAM modes 22,23 to fully exploit the extra degree of freedom provided by the OAM for both classical and quantum communications. The abovementioned conventional methods are useful for implementing only shift operations on the OAM mode, i.e., addition or subtraction.…”

Section: Introductionmentioning

confidence: 99%

Multiplication and division of the orbital angular momentum of light with diffractive transformation optics

2019

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We present a method to efficiently multiply or divide the orbital angular momentum (OAM) of light beams using a sequence of two optical elements. The key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular sector. By combining multiple circular-sector transformations into a single optical element, it is possible to multiply the value of the input OAM state by splitting and mapping the phase onto complementary circular sectors. Conversely, by combining multiple inverse transformations, the division of the initial OAM value is achievable by mapping distinct complementary circular sectors of the input beam into an equal number of circular phase gradients. Optical elements have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam lithography. Optical tests confirm the capability of the multiplier optics to perform integer multiplication of the input OAM, whereas the designed dividers are demonstrated to correctly split up the input beam into a complementary set of OAM beams. These elements can find applications for the multiplicative generation of higher-order OAM modes, optical information processing based on OAM beam transmission, and optical routing/switching in telecom.

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Electrically activated spin-controlled orbital angular momentum multiplexer

Cited by 8 publications

References 40 publications

Dual-functional metalenses for the polarization-controlled generation of focalized vector beams in the telecom infrared

Dual-functional metalenses for the polarization-controlled generation of focalized vector beams in the telecom infrared

Design of Dual-Functional Metaoptics for the Spin-Controlled Generation of Orbital Angular Momentum Beams

Multiplication and division of the orbital angular momentum of light with diffractive transformation optics

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