Superresolution imaging via superoscillation focusing of a radially polarized beam

Kozawa, Yuichi; Matsunaga, Daichi; Sato, Shunichi

doi:10.1364/optica.5.000086

Cited by 239 publications

(85 citation statements)

References 39 publications

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“…The phenomenon was first experimentally observed in the diffraction of coherent light by a quasicrystal array of nanoholes in a metal screen and its potential for spatial and temporal super-resolution focusing and imaging without evanescent fields was recognized, see Refs. [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Far-Field Superoscillatory Metamaterial Superlens

Yuan

Rogers

et al. 2019

Phys. Rev. Applied

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We demonstrate a metamaterial superlens: a planar array of discrete subwavelength metamolecules with individual scattering characteristics tailored to vary spatially to create subdiffraction superoscillatory focus of, in principle, arbitrary shape and size. Metamaterial free-space lenses with previously unattainable effective numerical apertures -as high as 1.52 -and foci as small as 0.33λ in size are demonstrated. Superresolution imaging with such lenses is experimentally verified breaking the conventional diffraction limit of resolution and exhibiting resolution close to the size of the focus. Our approach will enable far-field label-free super-resolution nonalgorithmic microscopies at harmless levels of intensity, including imaging inside cells, nanostructures, and silicon chips, without impregnating them with fluorescent materials.

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Section: Introductionmentioning

confidence: 99%

Far-Field Superoscillatory Metamaterial Superlens

Yuan

Rogers

et al. 2019

Phys. Rev. Applied

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“…Advances on laser technology are enabling the generation and use of pulses of light more and more complex, both on time (e.g., single-cycle pulses) and singular spatial distributions (e.g., ultrashort pulsed vortex, Bessel beams, etc.). In addition, there is a raising interest on ultrashort pulses exhibiting time-varying polarization (vector pulses) [1][2][3][4]. The use and analysis of vector pulses is a useful tool in the study of quantum wells properties [5], vector coherent control for selective isomerization of enantiomers [6][7][8][9] and the generation of THz pulses with time evolving polarization from IR vector pulses [7], to mention some examples.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Ultrashort Vector Pulses From Polarization Gates by In-Line, Single-Channel Spectral Interferometry

Alonso

Sola

2019

IEEE J. Select. Topics Quantum Electron.

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The growing use of ultrashort laser pulses exhibiting time-varying polarization (vector pulses) demands simple and robust characterization techniques capable to perform measurements in a broad range of experimental and environmental conditions. Here we present in-line, single-channel setup based on spectral interferometry to characterize ultrashort vector pulses. The use of a bulk interferometer based on birefringence is key for the stability and sensitivity of the technique, thus being simple and highly robust. The technique is used to measure vector pulses corresponding to polarization gates, which are used in many applications. Those results are validated by simulations. The technique here presented has a number of potential applications in nonlinear effects (e.g. transient birefringence and nonlinear phenomena with vector pulses).

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“…However, compared to figure (C) in Kozawa et al . (), the stronger side lobes of the superoscillation excitation spot can be filtered even if the radius of pinhole is equal to 2.0 AU. This case is helpful to realise the confocal microscopy with superoscillation excitation spot.…”

Section: Simulations and Discussionmentioning

confidence: 99%

“…Especially, Kozawa et al . () used the radially polarised Laguerre–Gaussian (LG) light beam to form a superoscillation hotspot, demonstrated experimentally that the superoscillation can improve the resolution of fluorescence imaging. However, the method combining the superoscillation with the FED microscopy has not been presented.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence emission difference microscopy by superoscillation excitation

Liu

Wang

Liu

et al. 2019

Journal of Microscopy

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Summary A superresolution fluorescence emission difference (FED) microscopy based on superoscillation excitation is investigated. The solid superoscillation excitation spot is produced by the radially polarised Laguerre–Gaussian beam (LG), and the donut superoscillation excitation spot is produced by the same LG beam with spiral phase modulation. We show that the superoscillation excitation can enhance the spatial resolution of FED microscopy. When the ratio of the pupil radius and the second moment radius of the LG3,1 beam is 0.85 and the subtractive factor is 0.3, the resolution can be enhanced about 2 times than the general confocal microscopy. Compared with the general FED microscopy, the resolution can be enhanced about 1.1 times. Our simulations also demonstrate that two‐view Richardson–Lucy (RL) deconvolution method can reduce the effect of side lobes, which is related to subtractive factor and pinhole. Lay Description The fluorescence emission difference (FED) microscopy is a high‐resolution light microscopy, which is based on the subtraction of images produced by two different confocal imaging modes. Here, the solid excitation spot is used in one imaging mode, and the donut excitation spot is in another imaging mode. There are various ways that the solid and donut excitation spots can be structured, but superoscillation excitation spots are still not used in the FED microscopy. Considering that the main lobe of superoscillation can be arbitrarily small in principle, we exploit the radially polarised Laguerre–Gaussian beam (LG) and spiral phase plate to produce superoscillation solid and donut spots. We present a detailed analysis about the performance of FED microscopy via superoscillation excitation. Our analysis is based on vector diffraction theory and supported by simulations of imaging. We find the proposed FED microscopy has better resolution than the confocal microscopy or the general FED microscopy excited by Gaussian beam. Especially, two‐view Richardson–Lucy (RL) deconvolution method can reduce the negative impact of strong side lobes, which is related to the subtractive factor and the size of pinhole located at the detector.

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Superresolution imaging via superoscillation focusing of a radially polarized beam

Cited by 239 publications

References 39 publications

Far-Field Superoscillatory Metamaterial Superlens

Far-Field Superoscillatory Metamaterial Superlens

Measurement of Ultrashort Vector Pulses From Polarization Gates by In-Line, Single-Channel Spectral Interferometry

Fluorescence emission difference microscopy by superoscillation excitation

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