Silicon-nitride-based medium-contrast gratings for resonant fluorescence enhancement in the visible wavelength range

Menon, Sruti; Krishna, Anirudh; Gupta, M. V. N. Surendra; Elikkottil, Ameen; Pesala, Bala; Raghunathan, Varun

doi:10.1117/12.2508778

Cited by 2 publications

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References 13 publications

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“…In the case of 1D sub-wavelength periodic grating structures, the role of the refractive index of the grating material on the resonant spectra are shown in Figure 6 [48,49]. A schematic view of the 1D grating structures simulated is shown in Figure 6a.…”

Section: Effect Of Refractive Index Contrast On Resonant Interactionmentioning

confidence: 99%

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Nonlinear Optics in Dielectric Guided-Mode Resonant Structures and Resonant Metasurfaces

et al. 2020

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Nonlinear optics is an important area of photonics research for realizing active optical functionalities such as light emission, frequency conversion, and ultrafast optical switching for applications in optical communication, material processing, precision measurements, spectroscopic sensing and label-free biological imaging. An emerging topic in nonlinear optics research is to realize high efficiency optical functionalities in ultra-small, sub-wavelength length scale structures by leveraging interesting optical resonances in surface relief metasurfaces. Such artificial surfaces can be engineered to support high quality factor resonances for enhanced nonlinear optical interaction by leveraging interesting physical mechanisms. The aim of this review article is to give an overview of the emerging field of nonlinear optics in dielectric based sub-wavelength periodic structures to realize efficient harmonic generators, wavelength mixers, optical switches etc. Dielectric metasurfaces support the realization of high quality-factor resonances with electric field concentrated either inside or in the vicinity of the dielectric media, while at the same time operate at high optical intensities without damage. The periodic dielectric structures considered here are broadly classified into guided-mode resonant structures and resonant metasurfaces. The basic physical mechanisms behind guided-mode resonances, electromagnetically-induced transparency like resonances and bound-states in continuum resonances in periodic photonic structures are discussed. Various nonlinear optical processes studied in such structures with example implementations are also reviewed. Finally, some future directions of interest in terms of realizing large-area metasurfaces, techniques for enhancing the efficiency of the nonlinear processes, heterogenous integration, and extension to non-conventional wavelength ranges in the ultra-violet and infrared region are discussed.

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Section: Effect Of Refractive Index Contrast On Resonant Interactionmentioning

confidence: 99%

“…The dimensions and wavelength are normalized by the pitch of the grating structure. (Figure isreproduced with permission from ref [49]…”

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Nonlinear Optics in Dielectric Guided-Mode Resonant Structures and Resonant Metasurfaces

et al. 2020

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Extended depth of focus multiphoton microscopy via incoherent pulse splitting

Chen¹,

Chakraborty²,

Daetwyler³

et al. 2020

Biomed. Opt. Express

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We present a beam splitter mask that can be easily added to a multiphoton raster scanning microscope to extend the depth of focus five-fold at a small loss in lateral resolution. The method is designed for ultrafast laser pulses or other light-sources featuring a low coherence length. In contrast to other methods of focus extension, our approach uniquely combines low complexity, high light-throughput and multicolor capability. We characterize the point spread function in a two-photon microscope and demonstrate fluorescence imaging of GFP labeled neurons in fixed brain samples as imaged with conventional and extended depth of focus two-photon microscopy.

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Silicon-nitride-based medium-contrast gratings for resonant fluorescence enhancement in the visible wavelength range

Cited by 2 publications

References 13 publications

Nonlinear Optics in Dielectric Guided-Mode Resonant Structures and Resonant Metasurfaces

Nonlinear Optics in Dielectric Guided-Mode Resonant Structures and Resonant Metasurfaces

Extended depth of focus multiphoton microscopy via incoherent pulse splitting

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