Ultrathin gradient nonlinear metasurface with a giant nonlinear response

Nookala, Nishant; Lee, Jongwon; Tymchenko, Mykhailo; Gómez‐Díaz, J. S.; Demmerle, Frederic; Boehm, Gerhard; Lai, Kueifu; Shvets, Gennady; Amann, M.-C.; Alù, Andrea; Belkin, Mikhail

doi:10.1364/optica.3.000283

Cited by 104 publications

(93 citation statements)

References 20 publications

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“…For instance, it can be used to implement a lens with two given focal distances at two wavelengths, or a lens converging at one wavelength and diverging at the other. In addition, given the generality of the meta-molecule concept, it can be applied to other areas of interest in metasurfaces (such as nonlinear [35][36][37] and microwave [38,39] metasurfaces). Multiwavelength operation is necessary in various microscopy applications where fluorescence is excited at one wavelength and collected at another.…”

Section: Resultsmentioning

confidence: 99%

Multiwavelength polarization-insensitive lenses based on dielectric metasurfaces with meta-molecules

Arbabi¹,

Arbabi²,

Kamali³

et al. 2016

Optica

414

308

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Metasurfaces are nanostructured devices composed of arrays of subwavelength scatterers (or meta-atoms) that manipulate the wavefront, polarization, or intensity of light. Like most other diffractive optical devices, metasurfaces are designed to operate optimally at one wavelength. Here, we present a method for designing multiwavelength metasurfaces using unit cells with multiple meta-atoms, or meta-molecules. A transmissive lens that has the same focal distance at 1550 and 915 nm is demonstrated. The lens has a NA of 0.46 and measured focusing efficiencies of 65% and 22% at 1550 and 915 nm, respectively. With proper scaling, these devices can be used in applications where operation at distinct known wavelengths is required, like various fluorescence microscopy techniques.

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Section: Resultsmentioning

confidence: 99%

Multiwavelength polarization-insensitive lenses based on dielectric metasurfaces with meta-molecules

Arbabi¹,

Arbabi²,

Kamali³

et al. 2016

Optica

414

308

View full text Add to dashboard Cite

show abstract

“…We should note here that the applications of optical metasurfaces in the general sense of the word (i.e., patterned thin layers on a substrate) go beyond spatial wavefront manipulation. Thin light absorbers [79][80][81][82][83][84][85][86][87][88][89][90][91][92][93], optical filters [94][95][96][97][98][99][100][101][102][103][104][105][106], nonlinear [107][108][109][110][111][112][113][114], and anapole metasurfaces [115,116] are a few examples of such elements. This review is focused on applications of metasurfaces in wavefront manipulation, and therefore it doesn't cover these other types of metasurfaces.…”

Section: Recent Developmentsmentioning

confidence: 99%

A review of dielectric optical metasurfaces for wavefront control

et al. 2018

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During the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here we review some of these recent developments with a focus on dielectric structures for shaping optical wavefronts. We discuss the mechanisms for achieving steep phase gradients with high efficiency, simultaneous polarization and phase control, controlling the chromatic dispersion, and controlling the angular response. Then we review applications in imaging, conformal optics, tunable devices, and optical systems. We conclude with an outlook on future potentials and challenges that need to be overcome. A. High-efficiency high-gradient phase controlSince high-contrast transmitarrays (HCA) are central to the most of the discussions of this section, we first briefly discuss their operation. We are primarily interested in the two-dimensional HCAs, and therefore we consider their case here, although much of the discussions are also valid for the one-dimensional case. In general, these devices are based on high-refractive-index dielectric nano-scatterers surrounded by low-index media [13, 38, 65, 67, 70-72, 76, 78]. The structure can be symmetric (i.e., with the substrate and capping layers having the same refractive indexes) [36] or asymmetric [66,67,76,78]. Depending on the materials and the required phase coverage, the thickness of the high-index layer is usually between 0.5λ 0 and λ 0 , where λ 0 is the free space wavelength. Typically, these structures are designed to be compatible with conventional microfabrication techniques;

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“…Recently, we introduced a novel platform for nonlinear metasurfaces, able to provide giant SHG efficiencies and simultaneously manipulate the emerging wavefront at will [9,12]. Specifically, we applied the Pancharatnam-Berry (PB) geometrical phase approach to nonlinear metasurfaces consisting of engineered split-ring plasmonic resonators loaded with nonlinear multiquantum wells (MQWs).…”

Section: Introductionmentioning

confidence: 99%

“…In [9,12] we applied the geometrical phase approach to nonlinear metasurfaces, adiabatically rotating subwavelength plasmonic resonators in order to tailor righthanded and left-handed circularly polarized (RCP and LCP) second harmonic (SH) wavefront profiles. Due to the lack of efficient methods to model nonlinear systems of large size and complexity, our previous work applied this paradigm only to simple structures made of elements rotated following a 1D phase gradient scheme.…”

Section: Introductionmentioning

confidence: 99%