Dual-band moiré metasurface patches for multifunctional biomedical applications

Wu, Zilong; Kelp, Glen; Yogeesh, Maruthi N.; Li, Wei; McNicholas, Kyle M.; Briggs, Adrian; Rajeeva, Bharath Bangalore; Akinwande, Deji; Bank, Seth R.; Shvets, Gennady; Zheng, Yuebing

doi:10.1039/c6nr06608a

Cited by 35 publications

(29 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So far, a number of metasurface-based functional optical elements have been realized in the mid-IR range, including lenses 4 , perfect absorbers 5 – 8 , polarization controllers 9 , 10 , modulators 11 , 12 , vortex beam generators 13 , thermal emitters 14 , nonlinear converters 15 , and infrared sensors 16 . Unfortunately, the devices are based on metallic nanostructures whose large optical losses restrict their operation to the reflective mode.…”

Section: Introductionmentioning

confidence: 99%

Ultra-thin high-efficiency mid-infrared transmissive Huygens meta-optics

et al. 2018

View full text Add to dashboard Cite

The mid-infrared (mid-IR) is a strategically important band for numerous applications ranging from night vision to biochemical sensing. Here we theoretically analyzed and experimentally realized a Huygens metasurface platform capable of fulfilling a diverse cross-section of optical functions in the mid-IR. The meta-optical elements were constructed using high-index chalcogenide films deposited on fluoride substrates: the choices of wide-band transparent materials allow the design to be scaled across a broad infrared spectrum. Capitalizing on a two-component Huygens’ meta-atom design, the meta-optical devices feature an ultra-thin profile (λ0/8 in thickness) and measured optical efficiencies up to 75% in transmissive mode for linearly polarized light, representing major improvements over state-of-the-art. We have also demonstrated mid-IR transmissive meta-lenses with diffraction-limited focusing and imaging performance. The projected size, weight and power advantages, coupled with the manufacturing scalability leveraging standard microfabrication technologies, make the Huygens meta-optical devices promising for next-generation mid-IR system applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Ultra-thin high-efficiency mid-infrared transmissive Huygens meta-optics

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In process 1, we employ NSL to create Au nanohole arrays on a Cu substrate, which is then transferred onto a sacrificing polymer layer. Specifically, polystyrene (PS) spheres with a diameter of 500 nm are self‐assembled into a hexagonally closed‐packed colloidal monolayer on water surface, which is then transferred onto a Cu substrate . An oxygen plasma etching process is applied to reduce the size of the PS spheres, followed by Au deposition onto the sample using thermal evaporation.…”

mentioning

confidence: 99%

Moiré Chiral Metamaterials

Zheng

2017

Advanced Optical Materials

Self Cite

117

View full text Add to dashboard Cite

nanostructures as building blocks. The excitation of the light-coupled collective resonances of free electrons in plasmonic nanostructures leads to the strong lightmatter interactions at the subwavelength scale. The chiral configuration makes the interactions depend on whether the incident light has left-handed circularly polarization (LCP) or right-handed circularly polarization (RCP). Therefore, it is possible to achieve plasmonic chiral metamaterials with strongly enhanced chiroptical effects and compact size. [1,[16][17][18] A large number of plasmonic chiral metamaterials with different configurations have been demonstrated including gammadions, [19] helixes, [10] and self-assembled chiral super structures. [20] The building blocks for solid-state chiral metamaterials on substrates are either inherently chiral plasmonic nanostructures [21][22][23][24] or anisotropic achiral plasmonic nanostructures stacked into chiral structures with site-specific twists. [25][26][27][28] Fabrication of these building blocks often requires sophisticated lithographic techniques such as e-beam lithography and focused ion-beam lithography to define features at the nanoscale for targeted performances. Moreover, multistep precise alignments are needed to fabricate the metamaterials consisted of the stacked building blocks. The structural and spatial precision for the building blocks is often below 50 nm for the metamaterials working in the visible and near-infrared regimes, limiting the fabrication throughput, scalability, and reproducibility. In addition, new design and fabrication of the samples are needed to tune the chiroptical responses.Herein, we report a new type of chiral metamaterials, known as moiré chiral metamaterials (MCMs), consisted of two layers of identical achiral Au nanohole arrays stacked into moiré patterns. In contrast to the previously reported plasmonic chiral metamaterials based on local structural chirality or site-specific twisting of anisotropic components, the optical chirality of MCMs is originated from relative in-plane rotation between the lattice directions of the two identical achiral layers. The chiroptical responses of the moiré chiral metamaterials can be precisely tuned by the in-plane rotation between the two layers of nanohole arrays. Through experimental and theoretical studies, we reveal mechanism behind the chiroptical effects in the moiré chiral metamaterials. Furthermore, we apply the moiré chiral metamaterials to achieve label-free enantiodiscrimination of biomolecules and drug molecules at the picogram level. With their ultrathin thickness (≈70 nm, which is only ≈1/10 of the operation wavelength), strong chirality, and high tunability, Plasmonic chiral metamaterials are promising for applications in chiral sensors and photonic devices due to their strong optical chirality and lightmatter interactions at the subwavelength scale. However, most of current plasmonic chiral metamaterials rely on local structural chirality or site-specific symmetry breaking, which has limited their optica...

show abstract

“…Due to their multiband optical responses with high tunability, moiré metamaterials and metasurfaces offer an approach toward versatile molecular spectroscopy and sensing. We have demonstrated Au moiré metasurfaces as multifunctional platforms . To further enhance the light–matter interactions, an Au moiré metasurface was put on an optically nontransparent Au film with a dielectric spacer.…”

Section: Applications Of Moiré Metamaterials and Metasurfacesmentioning

confidence: 99%

“…a–c) Dual‐band moiré metasurfaces as multifunctional biomedical platforms: a) schematic illustration of experimental setup and bacteria trapping by a laser‐induced microbubble; b) schematic illustration and c) spectroscopic analysis of protein denaturation by plasmon‐enhanced photothermal effects. (a–c) Reproduced with permission . Copyright 2016, Royal Society of Chemistry.…”

Section: Applications Of Moiré Metamaterials and Metasurfacesmentioning

confidence: 99%

Moiré Metamaterials and Metasurfaces

Zheng

2018

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

IntroductionOur ever-increasing knowledge of light-matter interactions has enabled the development of optical components and devices for light control. These range from macroscale mirrors for the Hubble Space Telescope to nanoscale optical cavities for onchip light sources. Devices made from conventional materials, however, enable limited light manipulation. For example, the most-skilled craftsmen of conventional lenses cannot exceed the diffraction limit of light to realize subwavelength focusing.Optical metamaterials and metasurfaces of microscale or nanoscale building blocks, also known as "meta-atoms," have emerged to overcome the limits of natural materials. Due to the reduced differences in length scale between electromagnetic waves and these building blocks, metamaterials and metasurfaces enhance light-matter interactions by orders. Advancements in modeling, nanofabrication, and characterization tools [1][2][3][4][5][6][7][8] have spawned metamaterials and metasurfaces with unprecedented light-manipulation capabilities, including subwavelength focusing, negative refraction, and superabsorption. [9][10][11][12][13][14][15] Optical metamaterials and metasurfaces often rely on the strong interactions between light and meta-atoms to manipulate light-propagation properties (e.g., phase, polarization, and amplitude). With the ability of surface plasmons to concentrate light at the nanoscale, plasmonic nanostructures enhance Optical metamaterials and metasurfaces enable versatile light manipulations. Advancements in modeling, nanofabrication, and characterization tools have led to the development of metamaterials and metasurfaces for many applications: energy conversion, biomedicine, and information technology. Recently, metamaterials and metasurfaces with moiré configurations have attracted strong interest due to their highly tunable optical responses and high-throughput fabrication. Herein, state-of-the-art moiré metamaterials and metasurfaces are reviewed. The presentation covers fabrication techniques, structure-property relationships, and applications in lasing and biomedical sensing. The review concludes with challenges and opportunities for moiré metamaterials and metasurfaces. www.advopticalmat.de metasurfaces which feature microscale and nanoscale metaatoms. Next, we discuss their properties and applications. We conclude with perspectives on challenges and opportunities.

show abstract

Dual-band moiré metasurface patches for multifunctional biomedical applications

Cited by 35 publications

References 55 publications

Ultra-thin high-efficiency mid-infrared transmissive Huygens meta-optics

Ultra-thin high-efficiency mid-infrared transmissive Huygens meta-optics

Moiré Chiral Metamaterials

Moiré Metamaterials and Metasurfaces

Contact Info

Product

Resources

About