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Article
Open AccessCompact coherent perfect absorbers using topological guided-mode resonances
We propose a topological coherent perfect absorber that enables almost ideal performance with remarkably compact device footprint and tight incident beams. The proposed structure is based on a topological junc...
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Article
Open AccessGeometric-phase intraocular lenses with multifocality
We demonstrate a new type of multifocal and extended depth of focus (EDOF) intraocular lenses (IOLs) embedding μm-thin geometric phase (GP) lens layers. As an emerging approach for lens phase design, the GP mo...
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Article
Open AccessInverse-cavity structure for low-threshold miniature lasers
Creating micro and nano lasers, high threshold gain is an inherent problem that have critically restricted their great technological potentials. Here, we propose an inverse-cavity laser structure where its thr...
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Open AccessAuthor Correction: Automated severity scoring of atopic dermatitis patients by a deep neural network
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Open AccessAutomated severity scoring of atopic dermatitis patients by a deep neural network
Scoring atopic dermatitis (AD) severity with the Eczema Area and Severity Index (EASI) in an objective and reproducible manner is challenging. Automated measurement of erythema, papulation, excoriation, and li...
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Article
Open AccessMonolithic focus-tunable lens technology enabled by disk-type dielectric-elastomer actuators
We propose a monolithic focus-tunable lens structure based on the dielectric-elastomer actuator (DEA) technology. In our focus-tunable lens, a soft lens and radial in-plane actuator mimicking the ocular focal-...
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Article
Open AccessDirect observation of time-asymmetric breakdown of the standard adiabaticity around an exceptional point
Recent study on topological operations around an exceptional point singularity has shown remarkably robust chiral processes that potentially create time-asymmetric or nonreciprocal systems and devices. Neverth...
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Open AccessAddendum: Observation of an anti-PT-symmetric exceptional point and energy-difference conserving dynamics in electrical circuit resonators
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Open AccessEvaluation of relationships between onychomycosis and vascular diseases using sequential pattern mining
Onychomycosis (OM) is a common nail disease. Although controversial, vascular diseases are considered independent predictors of OM and vice versa. Sequential pattern mining (SPM) has not been previously used f...
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Time-asymmetric loop around an exceptional point over the full optical communications band
Topological operations around exceptional points1–8—time-varying system configurations associated with non-Hermitian singularities—have been proposed as a robust approach to achieving far-reaching open-system dyn...
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Open AccessObservation of an anti-PT-symmetric exceptional point and energy-difference conserving dynamics in electrical circuit resonators
Parity-time (PT) symmetry and associated non-Hermitian properties in open physical systems have been intensively studied in search of new interaction schemes and their applications. Here, we experimentally dem...
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Article
Nanophotonic identification of defects buried in three-dimensional NAND flash memory devices
Advances in nanophotonics and plasmonics have led to the creation of a variety of innovative optical components and devices. However, the development of powerful practical applications has so far been limited....
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Open AccessMultiple p-n junction subwavelength gratings for transmission-mode electro-optic modulators
We propose a free-space electro-optic transmission modulator based on multiple p-n-junction semiconductor subwavelength gratings. The proposed device operates with a high-Q guided-mode resonance undergoing electr...
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Open AccessExtremely broadband, on-chip optical nonreciprocity enabled by mimicking nonlinear anti-adiabatic quantum jumps near exceptional points
Time-asymmetric state-evolution properties while encircling an exceptional point are presently of great interest in search of new principles for controlling atomic and optical systems. Here, we show that encir...
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Open AccessObservation of exceptional points in reconfigurable non-Hermitian vector-field holographic lattices
Recently, synthetic optical materials represented via non-Hermitian Hamiltonians have attracted significant attention because of their nonorthogonal eigensystems, enabling unidirectionality, nonreciprocity and...
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Open AccessCritical field enhancement of asymptotic optical bound states in the continuum
We study spectral singularities and critical field enhancement factors associated with embedded photonic bound states in subwavelength periodic Si films. Ultrahigh-Q resonances supporting field enhancement fac...
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Open AccessUltrahigh-Q metallic nanocavity resonances with externally-amplified intracavity feedback
We propose a mechanism of ultrahigh-Q metallic nanocavity resonances that involves an efficient loss-compensation scheme favorable for room-temperature operation. We theoretically show that surface plasmon-pol...
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Open AccessUnified Theory of Surface-Plasmonic Enhancement and Extinction of Light Transmission through Metallic Nanoslit Arrays
Metallic nanostructures are of immense scientific interest owing to unexpectedly strong interaction with light in deep subwavelength scales. Resonant excitations of surface and cavity plasmonic modes mediate s...
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Fabrication of Large Plasmonic Arrays of Gold Nanocups Using Inverse Periodic Templates
A facile procedure to fabricate large arrays of highly ordered metal nanocups, 250 nm in diameter, is reported. The nanostructure is generated from periodic photoresist templates created by holographic laser i...
