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Item type:Publication, Access status: without files , AI-driven design of high-performance optical thin film coatings for ultrafast lasersUltrafast laser systems critically depend on optical thin film coatings to control dispersion and light propagation, enabling precise shaping of light. Optical thin film coating design represents a complex inverse problem traditionally relying on computationally intensive numerical optimization methods. These conventional approaches, exemplified by the widely used Needle Algorithm [1], require significant computational resources and often rely on expert intervention [2]. We here propose a new approach to these challenges and present a physics-informed machine learning framework based on an autoencoder architecture and use it to design an ultra-broadband dispersive mirror.Publicationtype: Conference Paper23 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Chiral-absorber planar metasurface made by rotation of simple achiral meta-atomsThe research field of chiral metasurfaces has recently gained significant attention due to their ability to enable the observation of various phenomena, including chiral strong coupling [1], lasing [2] or harmonic generation [3]. In a previous work, we showed a robust metasurface consisting of rotated achiral silicon nanorods for generating optical chiral response [4]. The present study explores the same planar system combined with a metallic mirror, using its absorption as an advantage for shaping chiral resonances.Publicationtype: Conference Paper11 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , All-optical generation of quasi-Bound States in the Continuum resonances in a homogeneous dielectric thin film(2025-06); ; The concept of Bound States in the Continuum (BICs) was introduced in the context of localization of electronic wavefunctions [1], being demonstrated in various wave systems, including optics [2]. In such phenomena, a spatial localization of wave states occurs within a continuum of (non-localized) states. True BICs can only exist in lossless and infinite media, at least in one dimension [3]. Some kinds of BICs present symmetry properties which prevent their coupling to propagating optical modes, thus being called symmetry-protected BICs [4]. Finite photonic systems like metasurfaces (MSs) may present, however, a far-field-accessible counterpart of the BICs, the so-called quasi-BICs (qBICs), which start to be optically detectable after some degree of asymmetry is introduced in the MS unit cell [4]. This asymmetry can be of geometrical nature [5] or be introduced in geometrically symmetric unit cells composed by meta-atoms with materials possessing different dielectric permittivities [6]. In all the cases up to now, MSs, obtained via complex nanofabrication processes with normally unchangeable properties, were necessary to optically demonstrate the existence of qBIC states and investigate their optical characteristics, like near-field enhancement, frequency conversion or incident polarization dependence.Publicationtype: Conference Paper13 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Ultrafast tuning of radiative optical losses in quasi-bound states in the continuum(2025-06); ; Optically resonant metasurfaces provide a convenient way to enhance light-matter interactions in a confined spectral region, boosting nonlinear phenomena, sensitivity in biosensing, or spontaneous emission. Specifically, structures based on symmetry-protected quasi-bound states in the continuum (qBICs) have emerged as a popular framework to design resonant metasurfaces, as their structure does not only determine the resonance's wavelength, but also the quality-factor through the asymmetry of each unit cell [1].Publicationtype: Conference Paper15 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Temporal shaping of UV picosecond pulses for photoinjectors(2025); ; 22 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Pulse-self-steepening via optical push broom(2025); ; ; We demonstrate, through numerical simulations, an on-chip time lens and pulse self-steepening effect based on the optical push broom mechanism. A fast Kerr-induced refractive index front, generated within an optical waveguide, collects, traps, and concentrates the energy of a signal pulse propagating with a smaller group velocity, tuned near the bandgap of the periodically modulated waveguide. The high energy of the initial low-peak-power signal pulse accumulates within the front. This concentrated energy itself modifies the front and further steepens the leading edge of the signal pulse. The demonstrated effect can be utilized to compress signals in time and generate highly steep refractive index fronts.Publicationtype: Conference Paper23 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Elimination of dispersion ripples in a waveguide cavity using two slightly dispersion-shifted Bragg gratings(2025); ; ; Chip-integrated chirped or apodized Bragg gratings (CBGs) are key components for on-chip dispersion compensation. They are increasingly sought after for applications such as dispersion compensation for telecommunications, integrated chirped pulse amplifiers [1], mode-locked lasers [2], and ultrashort pulse soliton generation [3] on a silicon chip. However, maintaining flat group-delay dispersion (GDD) over a large bandwidth without strong ripples is challenging. These ripples typically arise from imperfect apodization profiles, and reflections at the grating boundaries, which can introduce phase inconsistencies and disrupt the desired dispersion profile.Publicationtype: Conference Paper19