Real-time sub-wavelength imaging of surface waves with nonlinear near-field optical microscopy

Frischwasser, Kobi; Cohen, Kobi; Kher-Alden, Jakob; Dolev, Shimon; Tsesses, Shai; Bartal, Guy

doi:10.1038/s41566-021-00782-2

Cited by 44 publications

(28 citation statements)

References 47 publications

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Nanoscale bioparticles with low refractive indices cause weak light-matter interactions, making them difficult to be optically observed. [3][4][5] To address this challenge, a variety of techniques have been used to visualize nanoparticles, viruses, and biomolecules including near-field optical microscopy, [6,7] ultra-high-resolution microscopy, [8][9][10] electron microscopy, [11][12][13] and other recently developed imaging and/or quantification techniques. [5,[14][15][16][17][18][19][20][21][22][23] Although these methods provide excellent resolution and quantitative information, these conventional approaches to imaging nanoscale bioparticles require sophisticated and/or customized equipment, complex data-processing algorithms, and specialized personnel.

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confidence: 99%

Gires–Tournois Immunoassay Platform for Label‐Free Bright‐Field Imaging and Facile Quantification of Bioparticles

Yoo

Lee

et al. 2022

Advanced Materials

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Bright‐field imaging of nanoscale bioparticles is a challenging task for optical microscopy because the light–matter interactions of bioparticles are weak on conventional surfaces due to their low refractive index and small size. Alternatively, advanced imaging techniques, including near‐field microscopy and phase microscopy, have enabled visualization and quantification of the bioparticles, but they require assistance of sophisticated/customized systems and post‐processing with complex established algorithms. Here, a simple and fast immunoassay device, Gires–Tournois immunoassay platform (GTIP) is presented, which provides unique color dynamics in response to optical environment changes and thus enables the label‐free bright‐field imaging and facile quantification of bioparticles using conventional optical microscopy. Bioparticles on GTIP slow down the velocity of reflected light, leading to vivid color change according to the local particle density and maximizing chromatic contrast for high spatial distinguishability. The particle distribution and density on the surface of the resonator are readily analyzed through 2D raster‐scanning‐based chromaticity analysis. GTIP offers multiscale sensing capability for target analytes that possess different refractive indices and sizes.

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Gires–Tournois Immunoassay Platform for Label‐Free Bright‐Field Imaging and Facile Quantification of Bioparticles

Yoo

Lee

et al. 2022

Advanced Materials

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“…To reach subdiffraction resolution, methods like scanning near-field optical microscopy (SNOM) [17][18][19][20][21], based on scattering of evanescent fields into propagating fields using a sharp tip in the near field, and nonlin-ear near-field optical microscopy (NNOM) [22], based on frequency up-conversion of evanescent fields into higher frequency propagating fields, have been used. However, SNOM techniques require both a source of light and detection at the imaging wavelength, with the additional complication that the tip itself strongly perturbs the field around the object.…”

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“…However, SNOM techniques require both a source of light and detection at the imaging wavelength, with the additional complication that the tip itself strongly perturbs the field around the object. The recently proposed NNOM technique [22] removes the need for detection at the imaging wavelength, yet still requires a source at the wavelength that excites the evanescent fields of the system. This requires elaborate coupling schemes for fields with large in-plane wave-vectors, e.g.…”

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Subdiffraction Quantum Imaging with Undetected Photons

Santos,

Pertsch,

Setzpfandt

et al. 2022

Preprint

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“…In nanoscopic structures, however, characteristic distances can be as small as a fraction of the light wavelengths involved, and therefore, additional strategies to enhance the nonlinear processes in this regime need to be developed. The potential applications of nonlinear optical phenomena on the nanoscale are vast and include ultrasensitive sensing, − high-resolution optical microscopy, − holography, − entangled photon pairs generation, ultrafast all-optical switching, , integrated optoelectronics, and all-optical computing and communication. , …”

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Nonlinear Dielectric Nanoantennas and Metasurfaces: Frequency Conversion and Wavefront Control

Grinblat

2021

ACS Photonics

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High-index dielectric nanostructures can support optical resonances of electric and magnetic character with ultralow linear absorption. In contrast to plasmonics, they can be engineered to confine electromagnetic fields inside the resonator, amplifying intrinsic nonlinearities of the dielectric. In this Review I examine the ability of dielectric nanoantennas and metasurfaces for efficient harmonic generation and wave-mixing processes, as well as nonlinear wavefront manipulation of the incident and radiated light. A detailed comparison is made between the many nanoscopic dielectric configurations reported in the literature, evaluating the influence of the material, crystal symmetry, structure geometry, and the different resonances involved (electric and magnetic Mie modes, Fano resonances, and quasi-nonradiative states, including anapoles and quasi-bound states in the continuum). The nonlinear performance of the nanosystems is analyzed, with emphasis on frequency conversion efficiency and emission directionality control, also discussing recent advances in nonlinear imaging, nonlinear holography, and all-optical switching. The role of topology in nonlinear nanophotonics is reviewed in the end, and potential future directions in the field are laid out.

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Real-time sub-wavelength imaging of surface waves with nonlinear near-field optical microscopy

Cited by 44 publications

References 47 publications

Gires–Tournois Immunoassay Platform for Label‐Free Bright‐Field Imaging and Facile Quantification of Bioparticles

Gires–Tournois Immunoassay Platform for Label‐Free Bright‐Field Imaging and Facile Quantification of Bioparticles

Subdiffraction Quantum Imaging with Undetected Photons

Nonlinear Dielectric Nanoantennas and Metasurfaces: Frequency Conversion and Wavefront Control

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