Costas P. Grigoropoulos
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View article: Optically Detected Magnetic Resonance Imaging and Sensing Within Functionalized Additively Manufactured Microporous Structures
Optically Detected Magnetic Resonance Imaging and Sensing Within Functionalized Additively Manufactured Microporous Structures Open
Quantum sensing with nitrogen-vacancy centers in diamond has emerged as a powerful tool for measuring diverse physical parameters, yet the versatility of these measurement approaches is often limited by the achievable layout and dimensiona…
View article: Exciton Dynamics in 2D Transition Metal Dichalcogenides
Exciton Dynamics in 2D Transition Metal Dichalcogenides Open
2D transition metal dichalcogenides (TMDCs) have emerged as a promising class of materials for broad applications. The physical properties of TMDCs are dominated by strong excitonic effects, which critically determine the performance of ph…
View article: Inverse design of photonic surfaces via multi fidelity ensemble framework and femtosecond laser processing
Inverse design of photonic surfaces via multi fidelity ensemble framework and femtosecond laser processing Open
We demonstrate a multi-fidelity (MF) machine learning ensemble framework for the inverse design of photonic surfaces, trained on a dataset of 11,759 samples that we fabricate using high throughput femtosecond laser processing. The MF ensem…
View article: Optical Emission Spectroscopy and Gas Kinetics of Picosecond Laser-Induced Chlorine Dissociation for Atomic Layer Etching of Silicon
Optical Emission Spectroscopy and Gas Kinetics of Picosecond Laser-Induced Chlorine Dissociation for Atomic Layer Etching of Silicon Open
The continuing developments in semiconductor device technologies have prompted the need for advanced nanoscale processing techniques. Laser chemical processing offers significant advantages, including spatial selectivity, high localization…
View article: Decoupling Carrier Dynamics and Energy Transport in Ultrafast Near-Field Nanoscopy
Decoupling Carrier Dynamics and Energy Transport in Ultrafast Near-Field Nanoscopy Open
Ultrafast near-field optical nanoscopy has emerged as a powerful platform to characterize low-dimensional materials. While analytical and numerical models have been established to account for photoexcited carrier dynamics, quantitative eva…
View article: Multiphoton and Harmonic Imaging of Microarchitected Materials
Multiphoton and Harmonic Imaging of Microarchitected Materials Open
Microadditive manufacturing has revolutionized the production of complex, nano- to microscale components across various fields. This work investigates two-photon (2P) and three-photon (3P) fluorescence imaging, as well as third-harmonic ge…
View article: In-situ TEM Holder for Ultrafast, Multimodal Imaging
In-situ TEM Holder for Ultrafast, Multimodal Imaging Open
This project developed a prototype in-situ specimen holder product to transmission electron microscope (TEM) users that drastically expand the usability of TEM by combining nanoscale laser excitation and optical signal collection. A commer…
View article: Spatially Resolved Quantum Sensing with High-Density Bubble-Printed Nanodiamonds
Spatially Resolved Quantum Sensing with High-Density Bubble-Printed Nanodiamonds Open
Nitrogen-vacancy (NV-) centers in nanodiamonds have emerged as a versatile platform for a wide range of applications, including bioimaging, photonics, and quantum sensing. However, the widespread adoption of nanodiamonds in practical appli…
View article: Near-Field Nanoimaging of Phases and Carrier Dynamics in Vanadium Dioxide Nanobeams
Near-Field Nanoimaging of Phases and Carrier Dynamics in Vanadium Dioxide Nanobeams Open
The stable coexistence of insulating and metallic phases in strained vanadium dioxide (VO2) has garnered significant research interest due to the intriguing phase transition phenomena. However, the temporal behavior of charge carriers in d…
View article: Inverse design of photonic surfaces on Inconel via multi-fidelity machine learning ensemble framework and high throughput femtosecond laser processing
Inverse design of photonic surfaces on Inconel via multi-fidelity machine learning ensemble framework and high throughput femtosecond laser processing Open
We demonstrate a multi-fidelity (MF) machine learning ensemble framework for the inverse design of photonic surfaces, trained on a dataset of 11,759 samples that we fabricate using high throughput femtosecond laser processing. The MF ensem…
View article: Nondestructive Imaging of Manufacturing Defects in Microarchitected Materials
Nondestructive Imaging of Manufacturing Defects in Microarchitected Materials Open
Defects in microarchitected materials exhibit a dual nature, capable of both unlocking innovative functionalities and degrading their performance. Specifically, while intentional defects are strategically introduced to customize and enhanc…
View article: Transient Nanoscopy of Exciton Dynamics in 2D Transition Metal Dichalcogenides
Transient Nanoscopy of Exciton Dynamics in 2D Transition Metal Dichalcogenides Open
The electronic and optical properties of 2D transition metal dichalcogenides are dominated by strong excitonic resonances. Exciton dynamics plays a critical role in the functionality and performance of many miniaturized 2D optoelectronic d…
View article: Near‐Field Nanoimaging of Colloidal Transition Metal Dichalcogenide Waveguides
Near‐Field Nanoimaging of Colloidal Transition Metal Dichalcogenide Waveguides Open
Bulk transition metal dichalcogenide (TMDC) nanostructures are regarded as promising material candidates for integrated photonics due to their high refractive index at the near‐infrared wavelengths. In this work, colloidal TMDC waveguides …
View article: Three-Dimensional Optical Imaging of Internal Deformations in Polymeric Microscale Mechanical Metamaterials
Three-Dimensional Optical Imaging of Internal Deformations in Polymeric Microscale Mechanical Metamaterials Open
Recent advances in two-photon polymerization fabrication processes are paving the way to creating macroscopic metamaterials with microscale architectures, which exhibit mechanical properties superior to their bulk material counterparts. Th…
View article: Light-driven C-H activation mediated by 2D transition metal dichalcogenides
Light-driven C-H activation mediated by 2D transition metal dichalcogenides Open
C-H bond activation enables the facile synthesis of new chemicals. While C-H activation in short-chain alkanes has been widely investigated, it remains largely unexplored for long-chain organic molecules. Here, we report light-driven C-H a…
View article: Obtaining auxetic and isotropic metamaterials in counterintuitive design spaces: an automated optimization approach and experimental characterization
Obtaining auxetic and isotropic metamaterials in counterintuitive design spaces: an automated optimization approach and experimental characterization Open
Recent advancements in manufacturing, finite element analysis (FEA), and optimization techniques have expanded the design possibilities for metamaterials, including isotropic and auxetic structures, known for applications like energy absor…
View article: Numerical Study of Carrier Dynamics in Pump–Probe Near-Field Nanoscopy
Numerical Study of Carrier Dynamics in Pump–Probe Near-Field Nanoscopy Open
The continuing miniaturization of semiconductor devices necessitates advanced techniques to probe carrier distribution and dynamics with high resolutions on both length and time scales. Pump–probe scattering-type scanning near-field optica…
View article: Complex Three-Dimensional Microscale Structures for Quantum Sensing Applications
Complex Three-Dimensional Microscale Structures for Quantum Sensing Applications Open
We present a novel method for fabricating highly customizable three-dimensional structures hosting quantum sensors based on nitrogen vacancy (NV) centers using two-photon polymerization. This approach overcomes challenges associated with s…
View article: Twisted moiré photonic crystal enabled optical vortex generation through bound states in the continuum
Twisted moiré photonic crystal enabled optical vortex generation through bound states in the continuum Open
The twisted stacking of two layered crystals has led to the emerging moiré physics as well as intriguing chiral phenomena such as chiral phonon and photon generation. In this work, we identified and theoretically formulated a non-trivial t…
View article: Obtaining auxetic and isotropic metamaterial in counterintuitivedesign spaces: An automated optimization approach and experimental characterization
Obtaining auxetic and isotropic metamaterial in counterintuitivedesign spaces: An automated optimization approach and experimental characterization Open
Recent advancements in manufacturing, finite element analysis (FEA), and optimization techniques have expanded the design possibilities for metamaterials, including isotropic and auxetic structures, known for applications like energy absor…
View article: Photothermally Activated Artificial Neuromorphic Synapses
Photothermally Activated Artificial Neuromorphic Synapses Open
Biological nervous systems rely on the coordination of billions of neurons with complex, dynamic connectivity to enable the ability to process information and form memories. In turn, artificial intelligence and neuromorphic computing platf…
View article: Dataset
Dataset Open
Dataset of the paper: "Twisted moiré photonic crystal enabled optical vortex generation through bound states in the continuum".
View article: Dataset
Dataset Open
Dataset of the paper: "Twisted moiré photonic crystal enabled optical vortex generation through bound states in the continuum".
View article: Complex 3-Dimensional Microscale Structures for Quantum Sensing Applications
Complex 3-Dimensional Microscale Structures for Quantum Sensing Applications Open
We present a novel method for fabricating highly customizable three-dimensional structures hosting quantum sensors based on Nitrogen Vacancy (NV) centers using two-photon polymerization. This approach overcomes challenges associated with s…
View article: Mechanisms of ultrafast GHz burst fs laser ablation
Mechanisms of ultrafast GHz burst fs laser ablation Open
Gigahertz (GHz) femtosecond (fs) lasers have opened possibilities for enhancing and controlling the laser machining quality to engineer the physicochemical properties of materials. However, fundamental understanding of laser-material inter…