Article
Optics
Chengli Wang, Chen Shen, Ailun Yi, Shumin Yang, Liping Zhou, Yifan Zhu, Kai Huang, Sannian Song, Min Zhou, Jiaxiang Zhang, Xin Ou
Summary: Wavelength-sized microdisk resonators were fabricated on a 4H-silicon-carbide-on-insulator platform, supporting whispering-gallery modes with high quality factors and low mode volumes at visible and near-infrared wavelengths. These resonators show compatibility with silicon-related spin defects and have potential applications in cavity quantum electrodynamics and integrated quantum photonic circuits.
Article
Optics
Chengli Wang, Jin Li, Ailun Yi, Zhiwei Fang, Liping Zhou, Zhe Wang, Rui Niu, Yang Chen, Jiaxiang Zhang, Ya Cheng, Junqiu Liu, Chun-Hua Dong, Xin Ou
Summary: Researchers demonstrate the generation of a single soliton microcomb on high-quality-factor microresonators fabricated on 4H-SiC-on-insulator thin films. They also observe wide spectral translation of chaotic microcombs from near-infrared to visible due to the second-order nonlinearity of SiC. This highlights the potential of SiC as a platform for future low-loss integrated nonlinear and quantum photonics.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Tianren Fan, Xi Wu, Sai R. M. Vangapandu, Amir H. Hosseinnia, Ali A. Eftekhar, Ali Adibi
Summary: This study demonstrates integrated electro-optic phase shifters based on 3C silicon-carbide-on-insulator platform operating at near-infrared wavelengths, showing optical performance and electro-optic coefficient. The SiCOI platform can be utilized for tunable silicon carbide integrated photonic devices suitable for nonlinear and quantum photonics applications.
Article
Materials Science, Multidisciplinary
Hao Jia, Jonathan P. Mccandless, Hailong Chen, Wenjun Liao, En Xia Zhang, Michael Mccurdy, Robert A. Reed, Ronald D. Schrimpf, Michael L. Alles, Philip X. L. Feng
Summary: Circular microdisk mechanical resonators in various resonance modes are essential for technologies such as photonics, cavity optomechanics, optical metrology, and quantum optics. The study focuses on the investigation of proton radiation effects on microdisk resonators made of 3C-SiC thin film. Results show consistent downshifts in resonance frequencies and attribute the frequency changes to radiation-induced Young's modulus change. These findings expand our understanding of proton radiation effects and have potential applications in harsh-environment sensing and integrated photonics.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Optics
Yanan Wang, Qiang Lin, Philip X-L Feng
Summary: The study proposes an integrated quantum photonic circuit using silicon carbide platform, achieving control of quantum states and frequency conversion through optimized design and functionality, providing design guidelines for future quantum information applications.
Article
Optics
Khadijeh Miarabbas Kiani, Henry C. Frankis, Andrew P. Knights, Jonathan D. B. Bradley
Summary: We present low-threshold and wide emission wavelength range hybrid-integrated silicon-thulium microdisk lasers based on a pulley-coupled design. The resonators are fabricated on a silicon-on-insulator platform using a standard foundry process, and the gain medium is deposited using a straightforward, low-temperature post-processing step. The lasers demonstrate lasing in 40- and 60-µm diameter microdisks with high output power and bidirectional slope efficiencies. The lasers also exhibit both single-mode and multimode laser emission spanning a range of wavelengths from 1825 to 1939 nm, making them suitable for monolithic silicon photonic integrated circuits.
Article
Optics
Milica Notaros, Thomas Dyer, Manan Raval, Christopher Baiocco, Jelena Notaros, Michael R. Watts
Summary: An integrated liquid-crystal-based phase modulator operating at visible wavelengths was developed and demonstrated. The device utilizes a silicon-nitride-based 300-mm-wafer foundry platform and a liquid-crystal integration process to actively tune the effective index of a section of silicon-nitride waveguide and induce a phase shift. The experimental results show that the device can achieve a significant phase shift within a compact size, providing a low-power solution for integrated systems at visible wavelengths.
Article
Engineering, Electrical & Electronic
Jinha Lim, Joonsup Shim, Inki Kim, Seong Kwang Kim, Hyeongrak Lim, Seung-Yeop Ahn, Juhyuk Park, Dae-Myeong Geum, SangHyeon Kim
Summary: In this study, we experimentally demonstrated a low-loss Ge-on-insulator (Ge-OI) passive waveguide with low absorptive yttrium oxide (Y2O3) as an insulator using wafer-bonding technology at mid-infrared wavelengths. We also designed and implemented additional passive circuits such as grating couplers and mode converters. By comparing the loss measurement between different environments, we found that narrow channel waveguides and slot waveguides with nanoscale slot gaps showed high optical loss due to CO2 absorption, indicating their potential as optical gas sensors.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Jiefu Zhu, Xuerui Sun, Tingting Ding, Yongzhi Tang, Shijie Liu, Yuanlin Zheng, Xianfeng Chen
Summary: Whispering-gallery-mode (WGM) microresonators are ideal for studying nonlinear optics due to their ability to enhance the interaction between light and matter. In this study, efficient second-harmonic generation (SHG) and sum-frequency generation (SFG) were demonstrated in a thin film lithium niobate microdisk, with high conversion efficiencies. This work expands the applications of WGM microresonators as efficient wavelength converters for light upconversion.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Dowan Kim, Hyung-Jun Park, Seo-Hee Jung, Won Jun Pyo, Syed Zahid Hassan, Hye Ryun Sim, Jeong-Hwan Lee, Dong-Woo Jee, Dae Sung Chung
Summary: A multichannel/multicolor visible light communication (VLC) system using entirely organic components is developed to demonstrate indoor lighting applications. The system utilizes tricolor (R/G/B)-selective organic photodetector arrays as receivers and tricolor organic light-emitting diode arrays as emitters. The study examines the effect of emission angle-dependent wavelength shift and luminosity function on the performance of the VLC system.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Jianghong Wu, Hui Ma, Chuyu Zhong, Maoliang Wei, Chunlei Sun, Yuting Ye, Yan Xu, Bo Tang, Ye Luo, Boshu Sun, Jialing Jian, Hao Dai, Hongtao Lin, Lan Li
Summary: Integration of PdSe2 with silicon waveguide enables the development of photodetectors with high responsivity, low noise, high bandwidth, and high data rate. This integration provides new opportunities for the application of van der Waals materials on integrated photonic platforms and shows great potential for various applications in the infrared range.
Article
Chemistry, Analytical
Cory Juntunen, Andrew R. R. Abramczyk, Peter Shea, Yongjin Sung
Summary: Spectroscopic microtomography allows for 4D imaging of thick microscopic specimens, capturing both absorption coefficient and refractive index. This study demonstrates the use of digital holographic tomography in the short-wave infrared (SWIR) wavelength to achieve spectroscopic microtomography. By utilizing a broadband laser and tunable optical filter, the system can scan wavelengths from 1100 to 1650 nm. The developed technique enables accurate and efficient analyses of microscopic specimens with distinct absorption or refractive index contrast in the SWIR range.
Article
Chemistry, Analytical
Jiayang Li, Andrew W. Poon
Summary: This paper demonstrates a 3C-SiC-on-insulator (3C-SiCoI)-based integrated photonic platform by transferring the epitaxial 3C-SiC layer to a borosilicate glass substrate. The fabrication process achieved nearly 100% area transferring die-to-wafer bonding. Waveguide-coupled microring resonators were fabricated with SF6-based dry etching and showed a moderate loaded quality (Q) factor of 1.4 x 10(5). The photorefractive effect was experimentally excluded at sub-milliwatt on-chip input optical power levels. This 3C-SiCoI platform holds promise for large-scale integration of linear, nonlinear and quantum photonics.
Article
Nanoscience & Nanotechnology
Vishal Kaushik, Swati Rajput, Sulabh Srivastav, Lalit Singh, Prem Babu, Elham Heidari, Moustafa Ahmed, Yas Al-Hadeethi, Hamed Dalir, Volker J. Sorger, Mukesh Kumar
Summary: A novel approach utilizing wavelength sensitive photocurrent across semiconductor heterojunctions for broadband wavelength detection on an on-chip platform is proposed. The device demonstrates high sensitivity, efficient intensity noise cancelation, and can be used in various applications.
Article
Physics, Applied
Zamir Ul Hassan, Razwan Siddique, Syeda Amna Sajjad, Zeshan Adeel Umer, Shujaht Bukhari, Muhammad Anwar-Ul-Haq, Mohsin Rafique, Syed Raza Ali Raza
Summary: In this study, a type-III heterojunction based on pulsed-laser-deposited vanadium dioxide (VO2) and p-type silicon (p-Si) substrate was successfully realized, showing a large self-powered and room-temperature photoresponse to various LED wavelengths. The temperature-dependent properties of the junction exhibit a sharp transition near 337 K, corresponding to a metal-insulator phase transition, which could potentially pave the way for temperature-tunable photodetectors.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Su-Hyun Yoo, Se-Ho Kim, Eric Woods, Baptiste Gault, Mira Todorova, Joerg Neugebauer
Summary: Atom probe tomography (APT) analysis provides near-atomic-scale information on the composition of complex materials. This study combines density-functional theory (DFT) calculations and APT measurements to investigate the origin of hydrogen residuals in APT experiments. The results demonstrate that material-specific physical properties strongly influence the detection of hydrogen residuals, contradicting the hypothesis of direct ionization of residual hydrogen without interaction with the specimen's surface.
NEW JOURNAL OF PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Yurii A. Romaniuk, Sergii Golovynskyi, Alexander P. Litvinchuk, Dan Dong, Yan Lin, Oleksandr Datsenko, Matteo Bosi, Luca Seravalli, Ivan S. Babichuk, Volodymyr O. Yukhymchuk, Baikui Li, Junle Qu
Summary: This study experimentally and theoretically investigated the vibration frequency changes in monolayer and few-layer MoS2 crystals, showing a good agreement between experimental and theoretical results. The proposed method can be used to estimate the layer thickness of MoS2 and determine interaction parameters, as well as to analyze spectra of other 2D layered materials.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Iqra Irfan, Sergii Golovynskyi, Oleg A. Yeshchenko, Matteo Bosi, Ting Zhou, Bin Xue, Baikui Li, Junle Qu, Luca Seravalli
Summary: This study investigates the enhancement of photoluminescence and Raman spectra in 2D MoS2 by decorating it with Au nanorods and nanospheres. The samples decorated with Au nanorods show the highest enhancement, which can be attributed to highly localized plasmonic hot spots.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Claudio Ferrari, Giovanni Attolini, Matteo Bosi, Cesare Frigeri, Paola Frigeri, Enos Gombia, Laura Lazzarini, Francesca Rossi, Luca Seravalli, Giovanna Trevisi, Riccardo Lolli, Lucrezia Aversa, Roberto Verucchi, Nahida Musayeva, Muhammad Alizade, Sevinj Quluzade, Teimur Orujov, Francesco Sansone, Laura Baldini, Francesco Rispoli
Summary: In this study, amino-functionalized carbon nanotubes were used to produce resistive sensors for detecting nitroaromatic explosives through their interaction with vapor. The sensors demonstrated simple construction, low power consumption, and potential for portable device preparation.
Article
Chemistry, Physical
Se-Ho Kim, Kang Dong, Huan Zhao, Ayman A. El-Zoka, Xuyang Zhou, Eric V. Woods, Finn Giuliani, Ingo Manke, Dierk Raabe, Baptiste Gault
Summary: By using cryo-atom probe tomography, we have discovered the degradation process between the liquid electrolyte and Si electrode. We found that the Si electrode corrodes before the charge-discharge cycles begin, and the delithiation process leads to the formation of nanograins. These nanograins are pulverized into nanoscale fragments that float in the electrolyte. The electrolyte also decomposes during this process. Understanding these microstructures is crucial for understanding the degradation of Si anodes and can potentially inform the design of new batteries.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Renelle Dubosq, Eric Woods, Baptiste Gault, James P. Best
Summary: Interest in low temperature environmental nanoindentation has grown due to its application in measuring the mechanical properties of ice. This is essential for accurately describing the rheologic behavior of natural ice and predicting its movement in response to climate change. A new experimental setup and protocol for in situ nanoindentation of water ice is introduced, demonstrating the potential for further studies on ice under controlled conditions.
Article
Chemistry, Physical
Sergii Golovynskyi, Oleksandr I. Datsenko, Muhammad Usman, Ana I. Perez-Jimenez, Marc Chaigneau, Matteo Bosi, Luca Seravalli, Tarek Hidouri, Iuliia Golovynska, Baikui Li, Honglei Wu
Summary: A comprehensive study is conducted on multilayer PbI2 flakes, including their structure, chemical composition, morphology and photoluminescence (PL). The reduction of thickness leads to uneven spatial mapping of PL and Raman intensities, while the spectra positions and shapes remain unchanged. The most intense peaks in the PL spectra are the direct free exciton (FX) peak at 2.44 eV (508 nm) and the bound exciton (BX) peak at 2.41 eV (516 nm). Three more defect-related peaks at 2.35, 2.19 and 2.04 eV are discovered through above/below-bandgap excitation variation. The origins of these BX peaks are clarified through DFT calculations and experimental results.
APPLIED SURFACE SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Eric Woods, Mahander P. Singh, Se-Ho Kim, Tim M. Schwarz, James O. Douglas, Ayman A. El-Zoka, Finn Giulani, Baptiste Gault
Summary: This study focuses on the challenges of preparing cryogenic specimens for atom probe tomography (APT), and presents a generalized workflow for cryogenic specimen preparation. The workflow includes lift-out via focused ion beam and in situ deposition of capping layers to strengthen specimens and protect them during transfer. The study demonstrates the reliable in situ deposition of a metallic capping layer and showcases its significant improvement in atom probe data quality.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Crystallography
Benedetta Ghezzi, Giovanni Attolini, Matteo Bosi, Marco Negri, Paola Lagonegro, Pasquale M. Rotonda, Christine Cornelissen, Guido Maria Macaluso, Simone Lumetti, Ruikang Tang
Summary: This study investigates the wettability of cubic silicon-carbide-based (SiC) surfaces and identifies SiO2/SiC core-shell nanowires (NWs) as a highly wettable material suitable for biological applications. The biocompatibility of the NWs is confirmed through non-toxicity tests on murine fibroblasts, and the efficacy of the surfaces is demonstrated through a proliferation assay on murine osteoblasts. Hence, SiO2/SiC NWs hold potential for biomedical applications in tissue engineering.
Article
Chemistry, Physical
F. Esposito, M. Bosi, G. Attolini, F. Rossi, S. E. Panasci, P. Fiorenza, F. Giannazzo, F. Fabbri, L. Seravalli
Summary: The objective of this study was to compare MoS2 2-dimensional monolayer flakes grown by Chemical Vapour Deposition using different density gradients in the liquid precursors solution. The structures grown using glycerol showed a larger variability in the lateral size of the triangular structure with good crystalline quality, while structures grown using iodixanol exhibited poorer crystalline quality with nanometric pores and more homogeneous sizing of the triangular structures. The lower crystalline quality of iodixanol samples resulted in reduced light emission efficiency and lower mobility.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
L. Seravalli, F. Esposito, M. Bosi, L. Aversa, G. Trevisi, R. Verucchi, L. Lazzarini, F. Rossi, F. Fabbri
Summary: Strain engineering is an efficient tool for adjusting the electrical and optical properties of 2D materials. In this study, we found that the built-in strain in MoS2 monolayers grown on a SiO2/Si substrate is mainly dependent on the size of the monolayer. A critical size of 20 μm was identified, beyond which the built-in strain significantly increased. The maximum built-in strain was observed in a 60 μm sized monolayer, which resulted in 1.2% tensile strain with partial strain release near the triangular vertexes due to nanocrack formation. These findings suggest that the standard method for evaluating the number of layers based on Raman mode separation may be unreliable for highly strained monolayers with a lateral size above 20 μm.
Article
Materials Science, Multidisciplinary
Muliang Zhu, Sajjad Abdollahramezani, Chentao Li, Tianren Fan, Hayk Harutyunyan, Ali Adibi
Summary: In this study, a dynamically reconfigurable asymmetric Fabry-Perot cavity based on phase-change alloy Ge2Sb2Te5 (GST) is numerically designed and experimentally demonstrated, showing a large shift of the third-harmonic generation (THG) resonant band. Continuous resonant spectral shifting is achieved through the precise control of the semicrystalline phase of GST. The tunable THG source provides efficient broadband harmonic generation in the violet-blue visible wavelength range.
ADVANCED PHOTONICS RESEARCH
(2022)
Article
Chemistry, Physical
Se-Ho Kim, Kang Dong, Huan Zhao, Ayman A. El-Zoka, Xuyang Zhou, Eric V. Woods, Finn Giuliani, Ingo Manke, Dierk Raabe, Baptiste Gault
Summary: By utilizing cryo-atom probe tomography, we have identified the degradation mechanisms of the liquid electrolyte, Si electrode, and their interface. The corrosion of the Si anode results from the decomposition of Li salt even before charge-discharge cycles. Volume shrinkage during delithiation leads to the formation of nanograins through recrystallization. These newly formed grain boundaries facilitate the pulverization of nanoscale Si fragments, some of which float in the electrolyte. Phosphorus is segregated to these grain boundaries, confirming the decomposition of the electrolyte. These findings contribute to an understanding of the self-catalyzed/accelerated degradation of Si anodes and can inform the development of new battery designs that are unaffected by these limiting factors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Po Dong, Jing Chen, Argishti Melikyan, Tianren Fan, Taylor Fryett, Changyi Li, Jiashu Chen, Chris Koeppen
Summary: Future optical transceivers will rely on silicon photonics to meet the increasing demands for high capacity density and energy efficiency. This review discusses its applications in 800G and beyond, as well as the challenges ahead.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Article
Nanoscience & Nanotechnology
Muliang Zhu, Sajjad Abdollahramezani, Chentao Li, Tianren Fan, Hayk Harutyunyan, Ali Adibi
Summary: This study demonstrates experimentally controllable second-harmonic generation (SHG) switches in a tunable metasurface by actively controlling the crystalline phase of germanium antimony telluride (GST). The results show that high modulation depths and resonant SHG efficiencies can be achieved by controlling the phase of GST, making these switches potentially useful for practical applications such as microscopy, optical communication, and photonic computing in the nonlinear regime.
