Article
Chemistry, Multidisciplinary
Ednan Joanni, Rajesh Kumar, Willians P. Fernandes, Raluca Savu, Atsunori Matsuda
Summary: In this article, we present a new laser processing method that combines in situ graphitization of polyimide with simultaneous transfer of graphene patterns onto various substrates. The synthesis conditions are similar to those of the well-known laser-induced graphene method. This approach involves enclosing polyimide sheets between microscope glass slides and has successfully generated graphene patterns on glass and PDMS substrates, as well as graphene decorated with metals and oxides. To illustrate its usefulness, this method was applied to the fabrication of hybrid supercapacitors which exhibited excellent electrochemical performance.
Article
Engineering, Electrical & Electronic
Yoonsoo Rho, Kyunghoon Lee, Letian Wang, Changhyun Ko, Yabin Chen, Penghong Ci, Jiayun Pei, Alex Zettl, Junqiao Wu, Costas P. Grigoropoulos
Summary: A reversible laser-assisted chlorination process can be used to create high doping concentrations in graphene monolayers without affecting the electrical mobility. This method offers a new approach for fabricating graphene-based photodetectors by creating rewritable photoactive junctions.
NATURE ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Huanming Zhang, Min Zhou, Yaqiong Guo, Zhenjiang Yu, Rui Xu, Liaoyong Wen, Yi Wang, Huaping Zhao, Yong Lei
Summary: The gas flow-assisted method (GFAM) enables wrinkle-free transfer of large-area ultrathin membranes onto arbitrary substrates by utilizing contact angle hysteresis to bulge trapped droplets and stretch the membranes. This method offers a simple and durable solution for transferring ultrathin membranes, without altering substrate surface properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Manufacturing
Kostas Andritsos, Ioannis Theodorakos, Filimon Zacharatos, Ayala Kabla, Semyon Melamed, Fernando de la Vega, Yoan Porte, Patrick Too, Ioanna Zergioti
Summary: This study investigates the behavior of conformal laser printing of silver nanoparticle inks on non-planar substrates and validates the versatility of laser processing in multilayered and multimaterial electronics.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Chemistry, Multidisciplinary
Ruirui Zhang, Lehua Qi, Hongcheng Lian, Jun Luo
Summary: Surface-embedded graphene patterns with piezoresistance behaviors are promising for developing small-strain sensors for wearable devices. However, the insufficient adhesion between the patterns and substrates has limited their utility. In this study, graphene patterns were directly deposited on PDMS surfaces using embedded droplet printing. The adhesion performance was evaluated through various tests, and the results demonstrate strong adhesion between the patterns and PDMS surfaces, indicating potential applications in flexible devices.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Aneena Lal, Hani Porat, Lea Ouaknin Hirsch, Rivka Cahan, Arie Borenstein
Summary: Bacterial growth on surfaces is a problem in various industries. This study presents a novel laser processing technique for synthesizing metaloxide/graphene nanoparticle composite films on plastic surfaces. The coatings demonstrate excellent antibacterial activity, making them promising for applications in medical equipment, fresh food storage, and water supply industries.
APPLIED SURFACE SCIENCE
(2024)
Article
Materials Science, Composites
Jalal Nasser, Lisha Zhang, Henry Sodano
Summary: The introduction of vertically aligned, laser-induced graphene (LIG) forests has been shown to significantly improve the interlaminar properties of carbon fiber reinforced composites, enhancing their fracture toughness. This improvement method is simple and convenient, effectively enhancing the performance of carbon fiber composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Letter
Materials Science, Multidisciplinary
Woo-Kyung Lee, Keith E. Whitener Jr
Summary: Researchers demonstrate a method of applying photolithography on curved substrates by performing the process on a planar surface and transferring the completed photopattern to the curved substrate. Two release layers, graphene-based and gelatin-based, are utilized for successful direct patterning of gold features on the curved substrate, enabling the patterning of electronically relevant materials on transparent curved surfaces.
MRS COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Borna Radatovic, Valentino Jadrisko, Sherif Kamal, Marko Kralj, Dino Novko, Natas Vujicic, Marin Petrovic
Summary: A major challenge in the investigation of 2D materials is the development of synthesis and manipulation methods for large-scale production. This study successfully synthesized and transferred millimeter-sized borophene sheets, demonstrating their potential application in more complex systems and devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Multidisciplinary
Shichuan Xue, Yizhi Wang, Junwei Zhan, Yaxuan Wang, Ru Zeng, Jiangfang Ding, Weixu Shi, Yong Liu, Yingwen Liu, Anqi Huang, Guangyao Huang, Chunlin Yu, Dongyang Wang, Xiang Fu, Xiaogang Qiang, Ping Xu, Mingtang Deng, Xuejun Yang, Junjie Wu
Summary: This research proposes a more efficient, flexible, and error-mitigated method for quantum process tomography. The method reduces the exponential costs associated with entanglement-assisted tomography and has been experimentally verified on a silicon photonic chip.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Yunbiao Zhao, Yue li, Yi Chen, Yuhan Chen, Danqing Zhou, Ziqiang Zhao
Summary: The direct synthesis of high-quality and uniform graphene on dielectric substrates is achieved by employing a Cu ion implantation assisted method, improving the growth rate of graphene without introducing metal contamination. An interesting growth behavior of graphene on sapphire substrate was observed, indicating potential applications in electronics.
Article
Chemistry, Multidisciplinary
Afsaneh L. Sanati, Alexandre Chambel, Pedro Alhais Lopes, Timur Nikitin, Rui Fausto, Mahmoud Tavakoli
Summary: This study demonstrates a method for large-scale, efficient, and low-cost fabrication of highly transparent conductors. The method involves spray coating a low-cost graphene oxide (GO) solution and then using a nanosecond fiber laser for reduction and thinning. By adjusting the laser parameters, different levels of transparency, conductivity, and full ablation can be achieved.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Zhengwei Wang, Jinlun Zheng, Guodong Chen, Kui Zhang, Tao Wei, Yang Wang, Xing Liu, Zhichang Mo, Tianyu Gao, Ming Wen, Jingsong Wei
Summary: In this laser-assisted thermal exposure lithography technique, the feature size of patterns can be arbitrarily tuned and changed, not limited to the spot size. The method allows for obtaining multiscale and multifunctional structures with different feature sizes at a high writing speed of over 10 m/s. This approach provides a pathway for direct laser writing with arbitrary feature sizes, high throughput, and low cost.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Mengying Li, Pinggen Zou, Zhi Chen, Ruotong Zhao, Cao Tang, Shuai Wang, Yanqing Ma, Lei Ma
Summary: The direct growth of graphene on an insulator is important for various applications, but synthesizing large area, homogeneous monolayer graphene with high quality remains a challenge. In this work, a full monolayer wafer-scale graphene film was successfully realized on a silicon/silicon oxide substrate. The synthesized graphene showed high quality and exhibited excellent properties.
ACS APPLIED NANO MATERIALS
(2023)
Article
Multidisciplinary Sciences
R. Lukose, M. Lisker, F. Akhtar, M. Fraschke, T. Grabolla, A. Mai, M. Lukosius
Summary: The research focuses on transferring graphene from Ge/Si wafers to isolating SiO2/Si and Si3N4/Si wafers using an electrochemical delamination process, with pre-treatment of the target substrates with oxygen plasma to improve graphene adhesion. This method may enable the development of graphene-based devices in standard Si technologies by enhancing the wetting properties and adhesion of graphene on isolating surfaces.
SCIENTIFIC REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Junil Kim, Kyungmin Ko, Hyeokjin Kwon, Joonki Suh, Hyuk-Jun Kwon, Jae-Hyuck Yoo
Summary: Copper oxide compounds have been recognized as promising p-channel materials with useful photovoltaic properties and superior thermal conductivity. However, the current deposition methods or thermal oxidation processes are difficult to apply to flexible substrates. In this study, we fabricated a metal-semiconductor-metal photodetector using laser-induced oxidation of thin Cu films under ambient conditions and analyzed its composition, morphology, and photoresponse. We also investigated the relationship between channel size and carriers using scanning photocurrent microscopy and verified the flexibility of the device through bending tests.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Matthew Eliceiri, Costas P. Grigoropoulos
Summary: In this study, we have improved the maximum two-dimensional translation rate of optically tweezed silicon nanowires using a silicon film substrate and a specific laser wavelength. We have also reduced the power usage significantly. The mechanism for the enhanced tweezing effect was explained using finite difference time domain simulation, and the robust and deterministic placement of the nanowires on the film surface was demonstrated experimentally.
Article
Engineering, Electrical & Electronic
Yoonsoo Rho, Kyunghoon Lee, Letian Wang, Changhyun Ko, Yabin Chen, Penghong Ci, Jiayun Pei, Alex Zettl, Junqiao Wu, Costas P. Grigoropoulos
Summary: A reversible laser-assisted chlorination process can be used to create high doping concentrations in graphene monolayers without affecting the electrical mobility. This method offers a new approach for fabricating graphene-based photodetectors by creating rewritable photoactive junctions.
NATURE ELECTRONICS
(2022)
Article
Physics, Applied
Minok Park, Matthew M. Balkey, Xianglei Mao, Jacob C. Jonsson, Costas P. Grigoropoulos, Vassilia Zorba
Summary: This study investigates the dynamics of laser ablation on graphite at sub-millisecond timescale and reveals the mechanisms behind the formation of well-defined ablation features. The findings provide valuable insights for parameter optimization and customization of laser machining processes.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Matthew Eliceiri, Anthony Mark, Darren Luke, Xun Zhu, Kaushik Iyer, Costas P. Grigoropoulos
Summary: The article utilizes recently developed methodologies to diagnose laser ablative plasmas and compares them with numerical model predictions. Time-resolved and qualitative data about plasma absorptivity are obtained through surface normal laser probing and imaging. The study finds a maximum error of 14% in plasma absorption between experiment and simulation at high energy density range tested.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Jingang Li, Rundi Yang, Yoonsoo Rho, Penghong Ci, Matthew Eliceiri, Hee K. Park, Junqiao Wu, Costas P. Grigoropoulos
Summary: The distribution and dynamics of carriers in semiconductor materials play a crucial role in their physical properties and performance in industrial applications. As electronic and photonic devices continue to shrink in size, there is a need for tools to study carrier behavior at picosecond time and nanometer length scales. In this study, we present pump-probe optical nanoscopy to investigate carrier dynamics in silicon nanostructures. By combining experiments with the point-dipole model, we are able to determine the size-dependent lifetime of photoexcited carriers in individual silicon nanowires. Additionally, we demonstrate the mapping of local carrier decay time in silicon nanostructures with sub-50 nm spatial resolution. This study enables the nanoimaging of ultrafast carrier kinetics and has promising applications in the design of various electronic, photonic, and optoelectronic devices.
Article
Materials Science, Coatings & Films
Matthew Eliceiri, Yoonsoo Rho, Runxuan Li, Costas P. P. Grigoropoulos
Summary: We have demonstrated laser mediated atomic layer etching (ALEt) of silicon. Chlorination was induced by dissociating Cl-2 gas using a loosely focused nanosecond pulsed 266 nm laser in parallel to the silicon surface. The chlorinated layer was then removed using pulsed picosecond irradiation, followed by continuous wave (CW) laser annealing to eliminate amorphization. Strong evidence of chlorination and uniform digital etching at 0.85 nm etching per cycle was observed based on atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS).
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Multidisciplinary
Yoonsoo Rho, SeokJae Yoo, Daniel B. Durham, DongJun Kang, Andrew M. Minor, Costas P. Grigoropoulos
Summary: Nonlinear optical response is a useful tool for studying the properties of materials, but its weak signal and limited reach make it difficult to probe deep-subwavelength-scale nonlinear optics. In this study, we propose a new method using an SHG-active plasmonic nanotip to achieve efficient second harmonic generation (SHG) nanoscopy. Our simulations suggest that enhancing the nonlinear response of the sample or suppressing the tip's response can lead to a high near-field SHG contrast, providing evidence of quantum mechanical nonlinear energy transfer. Furthermore, this technique can be used to study nanoscale corrosion and other physicochemical phenomena.
Article
Optics
Yoonsoo Rho, Christopher F. Miller, Robin E. Yancey, Ted A. Laurence, Christopher W. Carr, Jae-hyuck Yoo
Summary: We present a wide-field technique to investigate the transient changes in photoluminescence (PL) of defects on silica surfaces. The technique enables simultaneous spatially resolved PL capture with spontaneous quenching behavior. The quenching of PL intensity is attributed to photochemical reactions of surface defects and/or subsurface fractures with ambient molecules. Our theoretical model accurately reproduces the quenching curves, using two quenchable defect populations with different reaction rates. The spatial correlation of the fitting parameters with fractures in silica suggests regions prone to laser-induced damage growth, providing a rapid and non-destructive prediction of laser-induced damage growth.
Article
Materials Science, Multidisciplinary
Nathan J. Ray, Jae-Hyuck Yoo, Hoang T. Nguyen, Eyal Feigenbaum
Summary: A study reports the development of all-glass metasurfaces with antireflective properties, achieving a measured reflectance of 0.18% - 0.23% per interface across a wide range of wavelengths. This is the first-ever demonstration of an AR layer capable of such performance. The metasurfaces also show low reflectance values for different polarizations and acceptance angles, making them technologically significant.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Minok Park, Yueran Gu, Xianglei Mao, Costas P. Grigoropoulos, Vassilia Zorba
Summary: GHz fs bursts of laser enable the selection of optimal laser conditions for cross-cutting processing, micro/nano-fabrication, and spectroscopy applications by rapidly removing molten copper and limiting heat conduction.
Article
Chemistry, Multidisciplinary
Brian W. Blankenship, Runxuan Li, Ruihan Guo, Naichen Zhao, Jaeho Shin, Rundi Yang, Seung Hwan Ko, Junqiao Wu, Yoonsoo Rho, Costas Grigoropoulos
Summary: Biological nervous systems rely on complex, dynamic connectivity among billions of neurons, while artificial intelligence and neuromorphic computing platforms seek to mimic biological cognition. To incorporate the advantages of tunable dynamic software implementations into hardware, researchers have developed an artificial synapse with adaptable resistivity.
Article
Optics
Audrey Eshun, Xiyu Yi, Ashleigh Wilson, Sam Jeppson, Jae Hyuck Yoo, Shervin Kiannejad, Mike Rushford, Tiziana Bond, Ted Laurence
Summary: We utilized photon pair correlations generated via SPDC to measure the fluorescence lifetime of rhodamine 6 G dye. Our method, Q-FL measurements, used entangled photons to excite fluorescence and timed the resulting fluorescence photon in reference to the arrival time of the other entangled photon. This measurement demonstrates the potential of using entangled photons for fluorescence imaging with their fast sub-100 ps correlations that have not been shown with classical methods.
Article
Multidisciplinary Sciences
Tiancheng Zhang, Kaichen Dong, Jiachen Li, Fanhao Meng, Jingang Li, Sai Munagavalasa, Costas P. Grigoropoulos, Junqiao Wu, Jie Yao
Summary: In this work, a non-trivial twist-enabled coupling mechanism was identified and formulated in twisted bilayer photonic crystals, resulting in the generation of optical vortices. This study expands the field of moire photonics and opens up new possibilities for its applications.
NATURE COMMUNICATIONS
(2023)
Proceedings Paper
Optics
Nathan J. Ray, Jae-Hyuck Yoo, Hoang T. Nguyen, Michael A. Johnson, Eyal Feigenbaum
Summary: Recent studies have faced limitations in antireflective performance due to the restricted etching depth when utilizing metal etching masks to fabricate substrate-engraved metasurfaces. This article discusses advancements in etch mask technology to achieve deeper etching and taller metasurface features. The antireflective performance of these high aspect ratio structures with broad acceptance angles and broadband antireflective performance for both polarizations is also explored.
SPIE LASER DAMAGE: LASER-INDUCED DAMAGE IN OPTICAL MATERIALS 2022
(2022)
