This PDF file contains the front matter associated with SPIE Proceedings Volume 12652, including the Title Page, Copyright information, Table of Contents, and Conference Committee information.

We made a HfO₂ nanoantenna from HfO₂-thin films by using a combination of nanoimprint lithography and reactive ion etching. The nanoantenna comprising hexagonal lattice of HfO₂ nanodisks sustains electric and magnetic surface lattice resonances (SLRs) in the UV region, originating from radiative coupling between the local electric and magnetic dipoles via in-plane diffraction or Rayleigh anomaly. We also crystallized the HfO₂ nanoantenna by annealing. In spite of the crystallization, the refractive index did not change notably and thus the spectral shape of the SLR changed only slightly.

A universal model is described for Higher Harmonic Generation (HHG) in different states of matter. Based on an electromagnetic model (EM), the generation of Odd Higher Harmonic (HHG) and Supercontinuum (SC) from intense fs and ps pulses for visible, NIR, and MIR lasers is simulated for the different Kerr material response times τ from the ultrafast on the order of 100 attoseconds for electronic cloud distortion to fast ~10 femtoseconds from plasma and molecular redistribution and to the slower picoseconds rotational and vibrational molecular processes. The number of odd HHG generated is shown to depend critically on the fastest Kerr response time on the order of ~ a femtosecond from electronic self-phase modulation (ESPM). The EM model is universal for the production of HHG and SC in different states of matter.

Undulators are widely used in synchrotron light sources, which produce periodic magnetic field and make high energy electrons undulating or spiraling. Such electrons radiate electromagnetic waves which possess characteristic structures in space and time. We review our experimental results on the control of spatiotemporal structures of UV/EUV light wave packets emitted from relativistic electrons. From a device called helical undulators, optical vortex beam which has spiral phase structure can be generated. By using a combination of such undulators, optical vector beams can be synthesized. The radiation wave packets emitted from undulator possess ultrashort sinusoidal waveform with the number of cycles exactly same as that of the undulator magnetic periods. Those from two undulators arranged in tandem possess double-pulse time structure with attosecond precision. Their applications to coherent control of atoms and ultrafast spectroscopy were successfully demonstrated.

In recent years, the number of qubits in superconducting quantum computers has increased. It is anticipated that future attempts to realize fault-tolerant superconducting quantum computers will require an ability to fabricate large numbers of superconducting qubits uniformly on large-area substrates. Specifically, it is expected that technology will be developed to fabricate a large number of Josephson junctions on a 12-inch substrate in a short period with minimum dimensional variations in the superconducting quantum circuits. In this manuscript, we report on a technology that enables the uniform formation of resist patterns for Josephson junctions in large quantities on 12-inch substrates by replacing electron beam lithography with ArF immersion lithography.

1030 nm ytterbium-based solid-state femtosecond lasers are essential to robust near ultraviolet (NUV) and deep ultraviolet (DUV) generation. We will present the most up-to-date results in up to 6th harmonic generation and even x-ray generation. Lifetime, pulse-to-pulse, long-term stability, beam quality, and warm-up time will be reviewed as critical factors for successful materials processing and other applications. Last but not least, we will discuss various novel achievements already incorporated into commercial products, such as beam-shaped output directly from the module, pico-, and nanosecond spaced bursts in UV.

Metal halide perovskites (MHPs) have established their prominence in the field of optoelectronics, exhibiting considerable potential for use in light-emitting diodes (LEDs) spanning the red, green, blue, and even near-infrared spectra. Despite this, the exploration of MHPs within the ultraviolet light emission domain remains comparatively underexplored. In this study, we exploit the inherent versatility of perovskite composition and dimensionality to address this research gap. By integrating long organic ligands and mixed halides, we fabricate two-dimensional (2D) MHP thin films capable of achieving a diverse range of bandgaps within the ultraviolet region. To enhance the coverage of these thin films, we introduce water-based additives and a two-step annealing process into the fabrication protocol. A variety of analytical techniques, including absorption and photoluminescence spectra analysis, along with atomic force microscopy, were employed to characterize these 2D perovskite thin films. Our findings underscore the vast potential of MHPs for ultraviolet light-emitting diodes. This work is aimed at inspiring further investigations in this promising yet under-studied domain, paving the way for novel advancements in realization of bright and efficient ultraviolet emitting technology.

Synthetic Cannabinoids (SCs), also known as "Spice", are a category of Schedule 1 drugs consisting of over 200 chemically diverse compounds. They are prevalent in UK prisons and homeless groups often sold on a range of matrices (herbal, paper and fabric) and at unknown concentrations. To reduce the harm these drugs cause, rapid and accurate detection is required. Due to their chemical diversity, detection can be challenging. Their identification can be achieved using spectroscopic approaches such as LCQTOF-MS, LC-MS-MS, GC-MS, NMR, and ATR-IR. However, these are time-consuming and laboratory-intensive, requiring advanced training. Recently, we provided evidence that excitation-emission matrices can be used to ‘fingerprint the presence of SCs’ which we call a fluorescence spectral fingerprint (FSF). Here we demonstrate a portable device, based-on an array of LEDs as excitation sources, that can produce FSFs that are of sufficiently high resolution to discriminate FSFs of individual SCs.