Broadband spin‐controlled focusing via logarithmic‐spiral nanoslits of varying width

Mehmood, Muhammad Qasim; Liu, Hong; Huang, Kun; Mei, Sen; Danner, Aaron J.; Luk’yanchuk, Boris; Zhang, Shuang; Teng, Jinghua; Maier, Stefan A.; Qiu, Cheng‐Wei

doi:10.1002/lpor.201500116

Cited by 19 publications

(16 citation statements)

References 27 publications

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“…In the meantime, the conditions for achieving multifocal arrays are even stricter, because it requires distinct constructive and destructive interference at the exact positions, otherwise, the focal spots connect with each other and cannot be well distinguished. Even though there are several demonstrations of multifocal arrays generation using metalenses 29,49 , the generation of multifocal arrays using a 2D material lens has not been reported.…”

Section: Resultsmentioning

confidence: 99%

Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses

Wang¹,

Hao²,

Lin³

et al. 2021

OEA

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Ultrathin flat metalenses have emerged as promising alternatives to conventional diffractive lenses, offering new possibilities for myriads of miniaturization and interfacial applications. Graphene-based materials can achieve both phase and amplitude modulations simultaneously at a single position due to the modification of the complex refractive index and thickness by laser conversion from graphene oxide into graphene like materials. In this work, we develop graphene oxide metalenses to precisely control phase and amplitude modulations and to achieve a holistic and systematic lens design based on a graphene-based material system. We experimentally validate our strategies via demonstrations of two graphene oxide metalenses: one with an ultra-long (~16λ) optical needle, and the other with axial multifocal spots, at the wavelength of 632.8 nm with a 200 nm thin film. Our proposed graphene oxide metalenses unfold unprecedented opportunities for accurately designing graphene-based ultrathin integratable devices for broad applications.

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Section: Resultsmentioning

confidence: 99%

Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses

Wang¹,

Hao²,

Lin³

et al. 2021

OEA

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“…The dielectric substrate has a thickness of 0.2 mm with permittivity ε = 3.5. Note that similar plasmonic spiral structures 21 22 also have been used to focus light into a subwavelength spot. To evaluate the spoof-LSPs resonances on the complementary MSS, we calculate its near-field response spectrum using a full-wave commercial software CST Microwave Studio.…”

Section: Resultsmentioning

confidence: 99%

High-order spoof localized surface plasmons supported on a complementary metallic spiral structure

Gao

Zhang

2016

Sci Rep

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We experimentally demonstrate that multiple high-order spoof localized surface plasmons (spoof-LSPs) modes can be supported on a complementary metallic spiral structure, which were absent in the previously reported spoof-LSPs modes. Through exact numerical simulations and near-field imaging experiments, we directly observe these high-order spoof-LSPs modes at microwave frequencies. We also show that these higher-order spoof-LSPs modes exhibit larger frequency shifts caused by the local environmental refractive index change than the previously reported low-order spoof-LSPs modes. Hence the complementary MSS may find potential applications as plasmonic sensor in the microwave and terahertz frequencies.

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“…The resultant wave field is essentially a quasi-nondiffracting Bessel beam, whose depth of focus and transverse central spot can be tuned by changing the diameter of the subwavelength annular aperture. More recently, a logarithmic spiral nanoslit was proposed to converge an incident wave field of opposite handedness to that of the nanoslit into a subwavelength spot, a fact that is caused by a strong dependence on the incident photon spin [17]. By varying the nanoslit width, different incident wavelengths interfere constructively at different positions, thus configuring a sort of switchable and focus-tunable structure, as depicted in Figure 2.…”

Section: Fresnel Zone Plate Metalensesmentioning

confidence: 99%

Recent Progress in Far-Field Optical Metalenses

Naserpour¹,

Hashemi²,

Rodríguez³

2017

Metamaterials - Devices and Applications

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In this chapter, a review of the recent advances in optical metalenses is presented, with special emphasis in their experimental implementation. First, the Huygens' principle applied to ultrathin engineered metamaterials is introduced for the purpose of giving curvature to the wavefront of free-space wave fields. Primary designs based on metallic nanoslits and holey screens occasionally with variant width are first examined. Holographic plasmonic lenses are also explored offering a promising route to realize nanophotonic components. More recent metasurfaces based on nano-antenna resonators, either plasmonic or high-index dielectric, are analyzed in detail. Furthermore, 2D material lenses in the scale of a few nanometers enabling the thinnest lenses to date are here considered. Finally, dynamically reconfigurable focusing devices are reported for creating a scenario with new functionalities.

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Broadband spin‐controlled focusing via logarithmic‐spiral nanoslits of varying width

Cited by 19 publications

References 27 publications

Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses

Generation of super-resolved optical needle and multifocal array using graphene oxide metalenses

High-order spoof localized surface plasmons supported on a complementary metallic spiral structure

Recent Progress in Far-Field Optical Metalenses

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