Polarisation-selective hotspots in metallic ring stack arrays

Brooks, Laura J.; Mertens, Jan; Bowman, Richard; Chikkaraddy, Rohit; Sanders, Alan; Baumberg, Jeremy J.

doi:10.1364/oe.24.003663

Cited by 4 publications

(8 citation statements)

References 31 publications

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“…Polarization-selective green hotspots were also observed at different points of the hexagonal cells on both sides. Analogous polarization-dependent hotspots were also recently reported 51. Therefore, the SMLAs also enable the polarization dependent focusing.…”

supporting

confidence: 66%

High Numerical Aperture Hexagonal Stacked Ring-Based Bidirectional Flexible Polymer Microlens Array

2017

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Flexible imprinted photonic nanostructures that are able to diffract/focus narrow-band light have potential applications in optical lenses, filters, tunable lasers, displays, and biosensing. Nanophotonic structures through holography and roll-to-roll printing may reduce fabrication complexities and expenses and enable mass production. Here, 3D photonic nanostructures of a stacked ring array were imprinted on acrylate polymer (AP) over poly(ethylene terephthalate) (PET) substrate through holography and lift-off processes to create a microlens array (MLA). The surface structure of the array consisted of circular nonostepped pyramids, and repeated patterns were in hexagonal arrangements. Stacked-ring-based MLA (SMLA) on a flexible AP-PET substrate showed efficient bidirectional light focusing and maximum numerical aperture (NA = 0.60) with a reasonable filling factor. The nanostructures produced a well-ordered hexagonally focused diffraction pattern in the far field, and power intensities were measured through angle-resolved experiments. The variation of nanostep dimensions (width and height) and the number of steps resulted in different photonic bandgaps, and the arrays produced distance-dependent narrow-band light focusing. The validation of the SMLA was demonstrated through the text, image, and hologram projection experiments. It is anticipated that imprinted bidirectional SMLA over flexible substrates may find applications in optical systems, displays, and portable sensors.

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supporting

confidence: 66%

High Numerical Aperture Hexagonal Stacked Ring-Based Bidirectional Flexible Polymer Microlens Array

2017

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“…Polarization‐dependent hotspots arise at the connections between neighboring structures due to plasmonic resonance excitation by polarized‐light wave. [ 42 ] Therefore, the enhancement of localized electric and magnetic fields is observed based on polarizations. [ 43 ] This polarization‐dependent hotspots and optical properties were previously demonstrated at sub‐wavelength scale nano/microstructures by using numerical platform and followed with experimental validation.…”

Section: Resultsmentioning

confidence: 99%

“…[ 43 ] This polarization‐dependent hotspots and optical properties were previously demonstrated at sub‐wavelength scale nano/microstructures by using numerical platform and followed with experimental validation. [ 42,43 ] Furthermore, polarization‐dependent hotspots are of interest in different applications including bio‐sensing, precise light manipulation and a simplified route for polarization imaging. [ 44,45 ] The metalenses with birefringent meta‐atoms showed polarization‐controlled multifunctional properties and broadband achromatic focusing.…”

Section: Resultsmentioning

confidence: 99%

Strain‐Multiplex Metalens Array for Tunable Focusing and Imaging

Ahmed

Butt

2021

Advanced Science

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Metalenses on a flexible template are engineered metal‐dielectric interfaces that improve conventional imaging system and offer dynamic focusing and zooming capabilities by controlling the focal length and bandwidth through a mechanical or external stretch. However, realizing large‐scale and cost‐effective flexible metalenses with high yields in a strain‐multiplex fashion remains as a great challenge. Here, single‐pulsed, maskless light interference and imprinting technique is utilized to fabricate reconfigurable, flexible metalenses on a large‐scale and demonstrate its strain‐multiplex tunable focusing. Experiments, in accordance with the theory, show that applied stretch on the flexible‐template reconfigurable diffractive metalenses (FDMLs) accurately mapped focused wavefront, bandwidth, and focal length. The surface relief metastructures consisted of metal‐coated hemispherical cavities in a hexagonal close‐packed arrangement to enhance tunable focal length, numerical aperture, and fill factor, FF ≈ 100% through normal and angular light illumination with external stretch. The strain‐multiplex of FDMLs approach lays the foundation of a new class of large‐scale, cost‐effective metalens offering tunable light focusing and imaging.

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“…This process is a mask-free photolithographic technique in which interference patterns are generated by two laser beams and are printed directly into a photoresist. 46 Compared to colloidal lithography, this process does not rely on the formation of a defect-free monolayer and subsequent etching but can easily be repeated once the laser configurations are optimized for a specific pattern. Results of patterning by IL and subsequent CNT growth are shown in Figure 3 .…”

Section: Resultsmentioning

confidence: 99%

Anisotropic Carbon Nanotube Structures with High Aspect Ratio Nanopores for Li-Ion Battery Anodes

Jessl

Engelke

Copic

et al. 2021

ACS Appl. Nano Mater.

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Technological advances in membrane technology, catalysis, and electrochemical energy storage require the fabrication of controlled pore structures at ever smaller length scales. It is therefore important to develop processes allowing for the fabrication of materials with controlled submicron porous structures. We propose a combination of colloidal lithography and chemical vapor deposition of carbon nanotubes to create continuous straight pores with diameters down to 100 nm in structures with thicknesses of more than 300 μm. These structures offer unique features, including continuous and parallel pores with aspect ratios in excess of 3000, a low pore tortuosity, good electrical conductivity, and electrochemical stability. We demonstrate that these structures can be used in Li-ion batteries by coating the carbon nanotubes with Si as an active anode material.

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Polarisation-selective hotspots in metallic ring stack arrays

Cited by 4 publications

References 31 publications

High Numerical Aperture Hexagonal Stacked Ring-Based Bidirectional Flexible Polymer Microlens Array

High Numerical Aperture Hexagonal Stacked Ring-Based Bidirectional Flexible Polymer Microlens Array

Strain‐Multiplex Metalens Array for Tunable Focusing and Imaging

Anisotropic Carbon Nanotube Structures with High Aspect Ratio Nanopores for Li-Ion Battery Anodes

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