Article
Physics, Multidisciplinary
Zhongshuai Zhang, Xin Li, Yanyan Huo, Tingyin Ning
Summary: The impact of nonlocal response in metallic nanostructures on four-wave mixing processes in nonlinear plasmonic metasurfaces has been studied, showing significant enhancements in FWM efficiency and responses in different dielectric film conditions.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Mstyslav E. Kaliberda, Sergey A. Pogarsky
Summary: In this study, we accurately analyze the radiation of THz natural waves in dielectric waveguides scattered by a finite number of graphene strips using mathematical methods. We determine the numerical solutions for the propagation constants and fields of the natural waves, which are obtained from the equation involving the kernel function of the singular integral equation. By varying the chemical potential of graphene and structural geometrical parameters, we investigate the impact on the elevation angle of the radiation pattern and the radiated power.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Matteo Jugovac, Iulia Cojocariu, Jaime Sanchez-Barriga, Pierluigi Gargiani, Manuel Valvidares, Vitaliy Feyer, Stefan Blugel, Gustav Bihlmayer, Paolo Perna
Summary: By doping graphene with europium, single spin-polarized bands are generated, and the doping effect can be controlled by the positioning of europium. This doping enables the generation of flat bands with single spin character, providing new possibilities for the realization of spintronic devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Matteo Jugovac, Iulia Cojocariu, Jaime Sanchez-Barriga, Pierluigi Gargiani, Manuel Valvidares, Vitaliy Feyer, Stefan Bluegel, Gustav Bihlmayer, Paolo Perna
Summary: By europium doping, single spin-polarized bands can be generated in monolayer graphene supported by the Co(0001) surface. The doping is controlled by Eu positioning, allowing for the formation of a K over bar $\bar{\mathrm{K}}$-valley localized single spin-polarized low-dispersive parabolic band close to the Fermi energy when Eu is on top, and of a & pi;* flat band with single spin character when Eu is intercalated underneath graphene. In the latter case, Eu also induces a bandgap opening at the Dirac point while the Eu 4f states act as a spin filter, splitting the & pi; band into two spin-polarized branches. The generation of flat bands with single spin character, as revealed by the spin- and angle-resolved photoemission spectroscopy (ARPES) experiments, complemented by density functional theory (DFT) calculations, opens up new pathways toward the realization of spintronic devices exploiting such novel exotic electronic and magnetic states.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Chenyu Kong, Zhiping Wang, Benli Yu
Summary: We propose a scheme to transfer the helical phase information of OAM light to the generated FWM field via a graphene system, and manipulate and suppress the helical phase of the FWM field by adjusting the system parameters. The evolution of the helical phase is identified and examined through superposition modes of the FWM field and a Gaussian beam, showing good agreement with numerical simulations. This scheme provides a potential route to modulate the helical phase wavefront via FWM in graphene-based materials.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Physics, Multidisciplinary
Xiaodong Zeng, M. Suhail Zubairy
Summary: This study investigates the transmission of a two-level quantum emitter in its ground state through a graphene nanosheet and the nonadiabatic process produced by the graphene plasmons field distribution. It reveals a significant probability of exciting the quantum emitter and simultaneously emitting a GP, especially at speeds around 10^-4 times the speed of light. Furthermore, accelerated emitters cause GPs to exhibit a thermal field photon distribution with high temperature, providing a platform for observing the dynamical Casimir effect and simulating the Unruh effect.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Pierre Demongodin, Houssein El Dirani, Sebastien Kerdiles, Jeremy Lhuillier, Thomas Wood, Corrado Sciancalepore, Christelle Monat
Summary: The nonlinear optical response of graphene and its integration onto dielectric waveguides have been widely investigated. However, the experimental reports show a disparity due to different testing conditions and hybrid devices. In this study, Si3N4 waveguides locally covered by graphene patches were tested under 7 W peak powers, exhibiting a local change in nonlinearity and a moderate increase in the nonlinear waveguide parameter provided by graphene. This research provides guidelines for the design of hybrid integrated nonlinear devices coated with graphene or other 2D materials.
Article
Optics
Jianjun Cao, Shannan Geng, Meng Wu, Siqi Long, Nianxi Xu, Shumei Gao, Wenjie Wan
Summary: This study demonstrates wavelength-tunable and plasmon-enhanced four-wave mixing on an aluminum grating, showing significantly enhanced electromagnetic fields near the grating surface and an increase in 4WM signals by factors of 177 and 42 compared to off resonant conditions. The tunable and enhanced 4WM output from 539 to 600 nm has potential applications in frequency conversion, beam steering, and dispersion control.
Article
Physics, Multidisciplinary
Yang-Yang Jiang, Xiao-Shuang Xia, Jian-Bo Li
Summary: In this study, the four-wave mixing properties in a bilayer graphene nanosystem were theoretically investigated and an analytical formula for the four-wave mixing signal was derived. The research found that the lineshape of the four-wave mixing spectrum can be switched between two-peaked, three-peaked, four-peaked, five-peaked, and six-peaked by adjusting the phonon-exciton coupling strength, pumping intensity, and detuning between the exciton and the pump field. This study not only provides an efficient way to measure the phonon-exciton coupling strength in the bilayer graphene system, but also helps to explore the underlying physical mechanism in such a nanosystem.
ACTA PHYSICA SINICA
(2023)
Article
Engineering, Electrical & Electronic
Shizi Yu, Meisong Liao, Liang Chen, Tianxing Wang, Wanjun Bi, Weiqing Gao, Weibiao Chen, Lili Hu
Summary: We proposed a method for generating flat supercontinuum in a specified band using non-degenerate Raman four-wave mixing modulation. By controlling the dispersion of the photonic crystal fiber and the peak power of the pump light, we achieved broadband hyperspectral intensities in the short-wavelength direction. This method offers a new light source for optical coherence tomography, with improved axial resolution.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Kai Gu, Yang Zhang, Hanwen Zhao, Bin Xu, Bin Ni, Ming Sun, Xuefeng Liu, Jichuan Xiong
Summary: This paper proposes a novel method for generating surface plasmon polariton (SPP) vortex fields using positive elliptically polarized beams. The method can achieve SPP vortices with a uniform electric field intensity distribution and dynamically modulate the topological charge of the SPP vortex field by changing the polarization order and rotation direction of the incident vector beam.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Physics, Condensed Matter
Nguyen Van Men, Nguyen Quoc Khanh, Dong Thi Kim Phuong
Summary: This study calculates the plasmon frequency and damping rate of plasma oscillations in a spin-polarized bilayer graphene system. It shows that the degree of spin polarization has a negligible effect on the long wavelength plasmon frequency but affects the damping rate and frequency changes with increasing spin polarization. Moreover, an increase in carrier density significantly decreases both the plasmon frequency and damping rate, while the critical wave vector decreases with spin polarization and can be used to experimentally determine the degree of spin polarization.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Materials Science, Multidisciplinary
Yuanhongliu Gao, Xiaoyu Chen, Tonglei Cheng, Fang Wang, Xin Yan
Summary: This study demonstrates all-optical wavelength conversion using cascaded four-wave mixing (FWM) phenomena with graphene oxide (GO) and a highly nonlinear fiber (HNLF) device. The experimental results show that GO, with its strong third-order nonlinear effect, is an excellent material for nonlinear optical wavelength conversion. The amplification of HNLF and GO, along with the group velocity matching of pump and signal, promotes the cascaded nonlinear frequency mixing process. The maximum spacing between signal and pump is found to be 21 nm, and the order of cascaded FWM light increases as GO increases, leading to a maximum first-order FWM conversion efficiency of -14.5 dB. This is the first investigation of cascaded FWM-based all-optical wavelength conversion in HNLF-GO with wide wavelength selectivity, providing a new approach for fabricating high-performance nonlinear optical devices.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2024)
Article
Optics
Lan-Tian Feng, Yu-Jie Cheng, Xiao-Zhuo Qi, Zhi-Yuan Zhou, Ming Zhang, Dao-Xin Dai, Guang-Can Guo, Xi-Feng Ren
Summary: This study investigates the spontaneous four-wave mixing effect in cryogenically-operated silicon waveguides and demonstrates its effectiveness in generating quantum photonic sources. The generated cryogenic photon-pair source is verified over multiple frequency channels within a bandwidth of approximately 2 THz and is utilized to generate high-quality frequency-multiplexed energy-time entangled states. This work advances the development of cryogenic nonlinear photonics and scalable integrated photonics for quantum information processing.
Article
Optics
James D. Gaynor, Ashley P. Fidler, Yuki Kobayashi, Yen-Cheng Lin, Clare L. Keenan, Daniel M. Neumark, Stephen R. Leone
Summary: Attosecond four-wave mixing (FWM) spectroscopy is used to study the Rydberg wave packet dynamics in argon atoms. The experiment shows that the emitted signals from individual Rydberg states have oscillatory structure and persist beyond the expected lifetimes. The coherent amplitude transfer is driven by nonresonant NIR light through dark states during the FWM process.
Article
Materials Science, Multidisciplinary
Soroosh Daqiqeh Rezaei, Zhaogang Dong, Hao Wang, Jiahui Xu, Hongtao Wang, Mohammad Tavakkoli Yaraki, Ken Choon Hwa Goh, Wang Zhang, Shaban Reza Ghorbani, Xiaogang Liu, Joel K. W. Yang
Summary: In optical anti-counterfeiting, combining multiple optically variable devices (OVDs) using anisotropic gap-plasmon metasurfaces can enhance security and hinder fraudulent replication. By controlling phase, amplitude, and luminescence using this metasurface, it can display color images, holographic projections, and generate a luminescent image with a unique fingerprint. This highly secure and easy-to-authenticate metasurface-driven OVDs (mOVDs) only require commonly available equipment.
Article
Chemistry, Multidisciplinary
Ruihua He, Max Meunier, Zhaogang Dong, Hongbing Cai, Weibo Gao, Jesus Zuniga-Perez, Xiaogang Liu
Summary: Inorganic halide perovskite quantum dots have been widely used as efficient active materials in optoelectronic applications. In this work, we coupled a layer of perovskite quantum dots to dielectric Mie resonators to simultaneously exploit the Purcell effect and increase light extraction, resulting in an 18-fold increase in luminescence. Our numerical simulations and experimental measurements revealed the interplay of these two effects and provided guiding principles for maximizing the output intensity of quantum emitters and classical emitters in perovskite-based optoelectronic devices.
Article
Optics
Kyungduk Kim, Stefan Bittner, Yuhao Jin, Yongquan Zeng, Qijie Wang, Hui Cao
Summary: Limacon-shaped microdisk lasers are promising on-chip light sources with low threshold and unidirectional output. We conducted an experimental study on the lasing dynamics of Limacon-shaped semiconductor microcavities. The edge emission exhibits intensity fluctuations over a wide range of spatial and temporal scales, resulting from multiple dynamic processes with different origins and occurring on different spatiotemporal scales. The dominant process is an alternate oscillation between two output beams with a period as short as a few nanoseconds.
Article
Materials Science, Multidisciplinary
Jiteng Gu, Yan Liu, Nannan Meng, Vicknesh Sahmuganathan, Sze Chieh Tan, John Sudijono, Jiecong Tang, Eswaranand Venkatasubramanian, Abhijit Mallick, Febiana Tjiptoharson, Soroosh Daqiqeh Rezaei, Siew Lang Teo, Qiang Zhu, Yunjie Chen, Ming Lin, Zhaogang Dong, Kian Ping Loh
Summary: A dielectric metasurface-based structural color constructed on nanocrystalline diamond film is demonstrated, showing excellent color performance with high brightness and a relatively wide gamut. This work presents the first evidence that nanocrystalline diamond can serve as a robust and highly tunable dielectric platform for information encryption.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Shutao Zhang, Jun Zhang, Wei Peng Goh, Yan Liu, Febiana Tjiptoharsono, Henry Yit Loong Lee, Changyun Jiang, Jun Ding, Joel K. W. Yang, Zhaogang Dong
Summary: Electrical switching of nanophotonic structural color elements is a promising approach for addressable color switching pixels, but switching between primary colors and colorless state remains a challenge. This study presents a reversible electrical switching approach using electrocoagulation of Ag nanoparticles between silicon nanostructures with Mie resonances. The electrodeposited Ag nanoparticles enable a large spectral transformation through the excitation of hybrid plasmon-Mie resonance. This design outperforms others in electrotonic color control and is highly stable and reliable for use in high-resolution reflective displays.
Article
Optics
You Sin Tan, Hao Wang, Hongtao Wang, Chengfeng Pan, Joel K. W. Yang
Summary: The field of metasurface research has experienced rapid development in the past decade. Electron-beam lithography (EBL) is commonly used for rapid prototyping of metasurfaces, but it often faces challenges with low throughput. In this study, we propose the use of a chemically amplified resist, SU-8 with EBL, for rapid prototyping of low-index metasurfaces. By demonstrating the fabrication of an all-dielectric multilevel security print using SU-8 grating on silicon, we show that SU-8 EBL resist is a promising candidate for rapid prototyping of metasurface designs. Our findings can contribute to increasing the EBL patterning speed for various devices and structures.
PHOTONICS RESEARCH
(2023)
Review
Chemistry, Multidisciplinary
Hao Wang, Wang Zhang, Dimitra Ladika, Haoyi Yu, Darius Gailevicius, Hongtao Wang, Cheng-Feng Pan, Parvathi Nair Suseela Nair, Yujie Ke, Tomohiro Mori, John You En Chan, Qifeng Ruan, Maria Farsari, Mangirdas Malinauskas, Saulius Juodkazis, Min Gu, Joel K. W. Yang
Summary: The rapid development of additive manufacturing, especially in two-photon polymerization lithography (TPL), has revolutionized various research fields and industrial applications. TPL offers high nanoscale print resolution and has been widely used in diverse areas such as life sciences, materials sciences, mechanics, and microfluidics. With the optical transparency of the resins used, TPL is finding new applications in optics and photonics, enabling the exploration of light-matter interactions with unprecedented degrees of freedom. This review article discusses the fundamentals, fabrication methods, and a wide range of optical applications of TPL, including diffractive, topological, quantum, and color optics, and concludes with insights and perspectives on the future development of TPL and its potential optical applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yujie Ke, Qifeng Ruan, Yanbin Li, Hao Wang, Hongtao Wang, Wang Zhang, Chengfeng Pan, Parvathi Nair Suseela Nair, Jie Yin, Joel K. W. Yang
Summary: In this study, we have developed a method to engineer microscale switchable color pixels by creating localized inhomogeneous strain fields at the level of individual microlines. Trenches produced from 2.5D structures into elastomers exhibit uniform structural colors in the unstretched state, but show different colors under applied strain. This programmable topographic change resulting in color variation is achieved through strain mismatch between layers and trench width, and can be utilized for various optical devices based on dynamic structures and topographic changes.
Article
Nanoscience & Nanotechnology
Hongtao Wang, Hao Wang, Qifeng Ruan, John You En Chan, Wang Zhang, Hailong Liu, Soroosh Daqiqeh Rezaei, Jonathan Trisno, Cheng-Wei Qiu, Min Gu, Joel K. W. Yang
Summary: By miniaturizing spiral phase plates and integrating them with structural colour filters, we have successfully generated coloured orbital angular momentum beams using incoherent white light. These beams, which possess both spatial and temporal coherence, can independently generate multiple helical eigenstates and combine colour information into orbital angular momentum beams.
NATURE NANOTECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Pavel A. Dmitriev, Emmanuel Lassalle, Lu Ding, Zhenying Pan, Darren C. J. Neo, Vytautas Valuckas, Ramon Paniagua-Dominguez, Joel K. W. Yang, Hilmi Volkan Demir, Arseniy I. Kuznetsov
Summary: In this study, we propose and demonstrate single subwavelength hybrid dielectric-plasmonic optical nanoantennas that are coupled to localized quantum dot emitters and serve as efficient and bright unidirectional photon sources. The structure supports both antenna mode and gap mode resonances, and the resonance spectral positions can be controlled by tuning geometrical parameters. Experimental results show fluorescence enhancement factors up to 654x folds, mainly due to high radiative efficiencies, and directional emission of the photoluminescence into a cone of +/- 17 degrees normal to the sample plane. We believe this solution is viable and relevant for the next generation of light-emitting devices.
Editorial Material
Nanoscience & Nanotechnology
Pan Chengfeng, Zhang Shutao, Maria Farsari, Sang Hyun Oh, Joel K. W. Yang
Article
Materials Science, Multidisciplinary
Wei Chen, Yuyang Li, Yineng Liu, Yuan Gao, Yiming Yan, Zhaogang Dong, Jinfeng Zhu
Summary: Researchers have proposed an all-dielectric SERS metasurface design with quasi-bound states in the continuum (Q-BIC) by manipulating the incident angle. This design not only enhances the SERS signal but also extends the field-enhancing scale.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Cedric Finet, Qifeng Ruan, Yi Yang Bei, John You En Chan, Vinodkumar Saranathan, Joel K. W. Yang, Antonia Monteiro
Summary: Terrestrial organisms rarely possess optical transparency, but some butterflies and moths have evolved transparent wings through loss of pigments and alteration of wing scales. In this study, we investigated the mechanism of wing transparency in the butterfly Phanus vitreus. We found that transparency is achieved by loss of pigments and vertical arrangement of normal scales, combined with an anti-reflective nipple array on exposed parts of the wing membrane. The blueish coloration of transparent regions is attributed to the properties of the wing membrane and local scale nanostructures.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2023)
