This PDF file contains the front matter associated with SPIE Proceedings Volume 13111, including the Title Page, Copyright information, Table of Contents, and Conference Committee information.

We investigate the tunability of metasurface resonances through an electro-optic mechanism based on the Pockels effect. By integrating an electro-optic material with a designed multi-resonant nanoantenna array, we demonstrate control and wide-range tunability of the metasurface resonances. The applied electric field enables dynamic modulation of the optical properties, allowing for the adjustment of the metasurface response. This approach offers a versatile platform for developing tunable photonic devices, with potential applications in optical communication and sensing.

We review our recent studies about perfect absorbers by plasmonic and all-dielectric metasurface and its applications. We demonstrate refractory plasmonic thermal radiation emitters at mid-IR wavelength. In addition, we review photothermal control of light in silicon Huygens’ metasurface perfect absorbers based on degenerate critical coupling and its applications to all-optical switching of light as well as intensity modulation by quadrupole resonance.

Lithium Diborate (Li2O-2B2O3) glass doped with Sm³⁺ and silver nanoparticles (AgNP) were prepared by melt quenching technic. The morphological and optical properties are investigated. Transmission Electronic Microscopy (TEM) confirms silver nanoparticles presence, X- Ray Diffraction (XRD) verify the amorphous structure of the vitreous phase. UV–Vis–NIR absorption spectra showed Sm³⁺ absorption enhancement due to plasmon effect. The emission study confirms the luminescence enhances 2.53 times with the silver nanoparticles, due to energy transfer.

In this invited talk, I will present our recent developments and applications of dielectric metasurfaces in depth sensing, facial recognition, and topology-optimized high-Q metasurfaces. In the first part, we demonstrate a commercially compatible metasurface-based dot projector that integrates a metasurface hologram with photonic crystal surfaceemitting laser (PCSEL). Compared to conventional dot projectors, our approach achieves a 233-fold reduction in area, a 10.8-fold decrease in power consumption, a 1.43-fold increase in the number of near-infrared dots, and a twofold expansion in field-of-view (FOV). In the second part, we introduce a novel topology-optimized nonlocal metasurface that operates simultaneously at red, yellow, green, and blue wavelengths. Unlike local metasurfaces with broadband and broad-angle responses, nonlocal metasurfaces, exemplified by resonant waveguide gratings (RWGs), spatially and angularly configure optical wavefronts through narrow-band resonant modes. Our metasurface resonant waveguide grating (MRWG), designed using higher efficiency techniques compared to traditional RWGs, demonstrates experimental efficiencies up to 59% with a quality factor (Q-factor) of 93. It is also applied to achieve color selectivity, producing vivid colors at four narrow-band wavelengths with narrow-angle responses.

Plasmonics and metamaterials have attracted considerable attention over the past decade, owing to the revolutionary impacts that they bring to both fundamental physics and practical applications in multiple disciplines. These structures are routinely patterned by Electron Beam Lithography (EBL). For practical application, a large surface area coverage by uniform nanostructures is required. Therefore, accelerating EBL patterning speed for these structures will pave the way toward more practical applications. We present a fast fabrication of arrays of plasmonic nano-disks with quality factors ~ 30 using the dots-on-the-fly EBL.

The immense potential of metasurfaces is showcased by demonstrating several applications with plasmonic metasurfaces along with their polarization response using Mueller matrix spectroscopy. The work on plasmonic metalenses and holograms with an arbitrary composition of the AuAg alloys shows the successfully fabricated complex nanostructures only by heating nanostructures with a bilayer of Au and Ag of varying thickness at a low temperature of 300°C that retain the shape perfectly. In addition, the spin-orbit photonic effects in a waveguided plasmonic crystal after interacting with structured non-paraxial light via leaky mode excitation is imaged using dark-field Mueller matrix imaging.

Manipulation of plasmonic nanostructures with direction control has significant impact in science and engineering applications. We demonstrated the creation of the optical index anisotropy through self-organization of plasmonic gold nanoplates via 3D printing.

A family of samples of lithium borate glass doped with rare earths (erbium, ytterbium, dysprosium) and containing metallic nanoparticles were synthetized by melt-quenching technique. SEM micrograph is presented. X-ray diffraction patterns of all samples reveal the amorphous structure, which confirms their non-crystalline nature. Physical properties (such as density, molar volume, and boron-boron separation) of amorphous materials and their modifications when the metallic nanoparticles are added in the matrices are shown. UV–Vis-IR absorption spectra of all samples were recorded and display the characteristic bands of the used rare earths; all absorption bands present an enhancement with increasing plasmonic concentration. Emission spectra of doped samples were collected in the temperature range from 30 to 180 Celsius degrees. The results of emission under temperature indicate that the addition of plasmons in glass matrices are responsible for emission stabilization in samples when the temperature is increased.

We explore improved Plasmonic nanostructure fabrication using process and experiment design methodologies using a DOE and process tracking tool PanMo-Confab. This methodology is shown to yield a robust process window in case of plasmonic nanostructure fabrication and a faster time to optimal design and response variable tuning.

Multispectral infrared sensor is a novel technology for detecting infrared, providing simultaneous spectral and spatial information of the target object. However, conventional multispectral infrared sensors face limitations in quantum efficiency due to a low pixel filling ratio. The integration of bandpass filters and sensors poses challenges, including processing difficulty, filter layer thickness, and material constraints.

In this work, we present a highly efficient, miniaturized optical filter with a plasmonic filter-based microlens array for a high-efficiency multispectral infrared sensor. Microlens arrays enhance light-gathering efficiency in infrared elements, resulting in high quantum efficiency, while the plasmonic filter, utilizing a 3D post array nanostructure, offers wavelength selectivity. This approach streamlines the integration of micro/nanostructures into infrared imaging sensors, significantly enhancing sensing performance beyond existing methods.

Defocusing in an optical system is a common practical issue that affects the quality and shape of the beam and is hence important in the light-matter interaction. A detailed investigation is carried out on the interaction of the tightly focused beam with a spherical nanoparticle under defocusing. Tightly focused beams with linear and radial polarization are considered for the investigation and the influence of such beams on plasmonic characteristics of a nanoparticle is analyzed. The effect of defocusing is observed on intensity enhancement in near-field in different surrounding media.