Article
Optics
M. Merkel, T. Schemme, C. Denz
Summary: The article presents a versatile and low-cost method for fabricating a Vogel spiral relief grating and investigates its diffractive properties. One application involves using it as a surface structure, leading to an efficiency enhancement of 18% in organic solar cells.
Article
Materials Science, Multidisciplinary
M. Prado, F. Sgrignuoli, Y. Chen, L. Dal Negro, F. A. Pinheiro
Summary: This study investigates the spatial decay and temporal localization properties of quasimodes in two-dimensional Vogel spirals, revealing the coexistence of three distinctive decay types and the characterization of Gaussian decay as the most localized quasimodes. The findings are supported by no-fitting analysis of localization maps and calculations of electric fields in real space, providing direct evidence of algebraic spatial decay of critical quasimodes. The existence of both long-lived and spatially localized quasimodes in Vogel spirals could potentially offer novel optical functionalities for applications in light sources and sensing devices.
Article
Optics
Martin Aeschlimann, Tobias Brixner, Felix Fenner, Benjamin Frisch, Patrick Folge, Michael Hartelt, Matthias Hensen, Thomas H. Loeber, Walter Pfeiffer, Sebastian Pres, Bernd Stannowski
Summary: This study demonstrates the imaging of localized modes in golden Vogel spirals using photoemission electron microscopy (PEEM). The ability to visualize these modes offers a means to explore mode dynamics and perform nanospectroscopy.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Physics, Applied
Oliver J. Trojak, Sean Gorsky, Connor Murray, Fabrizio Sgrignuoli, Felipe A. Pinheiro, Luca Dal Negro, Luca Sapienza
Summary: Enhancing light-matter interactions on a chip using aperiodic structures allows for efficient visible light confinement and higher quality factors for optical resonances. This approach shows potential applications in active nanophotonic devices, improving the understanding of fundamental physical properties of light-emitting systems.
APPLIED PHYSICS LETTERS
(2021)
Article
Optics
Maoji Wang, Lauren R. Richey-Simonsen, Jordan M. Gerton
Summary: To investigate the optical modes in nanophotonic devices, researchers demonstrated a probe-free, far-field method to characterize the optical modes within GaN nanowires, observing spectral signatures resulting from lateral leakage of waveguide modes. By using an analytical model coupled with finite element simulations, they were able to accurately deduce the transverse dimension of the nanowires from hyperspectral images.
Article
Nanoscience & Nanotechnology
Zhiming Chen, Jianhua Zeng
Summary: This study theoretically and numerically investigates the formation, properties, and dynamics of matter-wave localized gap modes in a one-dimensional nanoscale darkstate optical lattice. It reveals that localized modes in deeply subwavelength adiabatic lattices exhibit a cusplike mode, contrary to previously reported results in conventional deep optical lattices.
Article
Nanoscience & Nanotechnology
Polina E. Zimnyakova, Daria O. Ignatyeva, Dolendra Karki, Andrey A. Voronov, Alexander N. Shaposhnikov, Vladimir N. Berzhansky, Miguel Levy, Vladimir Belotelov
Summary: We demonstrate a novel all-dielectric magnetophotonic structure that enhances the Faraday effect and transverse magnetooptical Kerr effect by simultaneous excitation of localized and lattice optical modes. This structure shows improvements in wide spectral and angular ranges, making it promising for applications with short and tightly focused laser pulses.
Article
Multidisciplinary Sciences
Fengmiao Li, Yuting Zou, Myung-Geun Han, Kateryna Foyevtsova, Hyungki Shin, Sangjae Lee, Chong Liu, Kidae Shin, Stephen D. Albright, Ronny Sutarto, Feizhou He, Bruce A. Davidson, Frederick J. Walker, Charles H. Ahn, Yimei Zhu, Zhi Gang Cheng, Ilya Elfimov, George A. Sawatzky, Ke Zou
Summary: This study reports the successful growth of single-crystalline TiO(001) film using molecular beam epitaxy, enabling a first-time study of stoichiometric TiO thin films. The research shows that TiO is metal but in proximity to Mott insulating state, with a transition to the superconducting phase observed below 0.5 K close to that of Ti metal.
Article
Optics
Ahmed H. Hammad, Ahmed R. Wassel, G. O. Rabie, Samir Y. Marzouk
Summary: Strontium zinc phosphate glasses containing neodymium ions were prepared. The presence of phosphate groups in the Q2 mode overlapping with Zn-O and Sr-O bonds was observed in the current glasses. The replacement of SrO with Nd2O3 increased the glass density. The optical transition was found to be an indirect transition with varying values. The absorption spectra showed distinct peaks due to the presence of Nd2O3, and the emission spectra suggested possible emission of NIR lasers at specific wavelengths.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ales Vlk, Martin Ledinsky, Andrey Shiryaev, Evgeny Ekimov, Stepan Stehlik
Summary: The bottom-up high-pressure, high-temperature synthesis method allows for unprecedented control over the size of nanodiamonds. In this study, nanodiamonds with sizes ranging from 1.2 to 8 nm were analyzed using multiwavelength Raman spectroscopy. The low-frequency acoustic Raman modes were utilized to determine the size of quantum-sized sub-3 nm nanodiamonds, showing remarkable agreement with other measurement methods such as XRD and HRTEM.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Engineering, Electrical & Electronic
Guo Zhu, Yu Wang, Zhi Wang, Ragini Singh, Carlos Marques, Qiang Wu, Brajesh Kumar Kaushik, Rajan Jha, Bingyuan Zhang, Santosh Kumar
Summary: This work investigates the fabrication of sensor structures by splicing tapered/etched multicore fiber probes with multimode fiber and immobilizing them with gold nanoparticles and molybdenum disulfide nanoparticles to enhance sensitivity. The morphology of the nanoparticles is examined using high-resolution transmission electron microscopy, and the immobilized optical fiber sensor structures are characterized using scanning electron microscopy and SEM-EDX. The functionalization of the acetylcholinesterase enzyme over the nanoparticle-immobilized probe increases sensor specificity. The developed sensor probes are tested for detecting various concentrations of acetylcholine, and performance analyses are performed. The developed tapered fiber sensor exhibits a high sensitivity and wide detection range.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Materials Science, Ceramics
Ce Li, Xu Zhang, V. C. Onah, Weiling Yang, Zhuang Leng, Kexuan Han, Fangming Zhang, Yong Zhang, Yu Han, Yongtao Li, Huisheng Liu, Hai Lin, Chun Li, Dingfu Zhou, Fanming Zeng
Summary: The formation and structural features of the TeO2-WO3-GdF3 glass system were studied by adjusting the proportions, and the potential application value was determined.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Applied
B. Fluegel, A. D. Rice, K. Alberi
Summary: Low-temperature Raman scattering was used to investigate the crystal structure of Cd3As2 and (Cd1-x Zn (x) )(3)As-2. The results showed that the crystal structure of Cd3As2 was consistent with bulk-grown Cd3As2, but distinct from nanoscale platelets and wires. In (Cd1-x Zn (x) )(3)As-2, the phonon frequencies and scattering amplitudes varied continuously with Zn concentration, but at least one frequency was absent at the alloy endpoint.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Haiyan Lu, Li Huang
Summary: By investigating the correlated electronic states of PuIn3 with a combination of density functional theory and dynamical mean-field theory, a temperature-dependent itinerant-localized crossover of 5f electrons was identified, along with an enhancement of quasiparticle multiplets and a possible electronic Lifshitz transition at low temperatures. These results also revealed the presence of orbital selective 5f electronic correlations in PuIn3, enriching the understanding of Pu-based compounds and providing critical predictions for ongoing experimental research.
Article
Chemistry, Physical
Yaming Zhang, Wuduan Zhao, Jun Lu, Yunfeng Zhang, Haibao Zhang, Xiaojun Li
Summary: Graphdiyne (GDY) is a promising two-dimensional carbon material with unique structural features. In this study, a series of AuGen-GDY complexes were designed and systematically studied. The adsorption of endohedral AuGen clusters on GDY surface was found to be stable, and the electronic and optical properties of the complexes were analyzed. This study highlights the importance of endohedral cluster adsorption on GDY surface and provides insights for the synthesis of novel GDY-based cluster-assembled materials.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Physics, Applied
Seul-Ki Moon, Kwang-Yong Jeong, Heeso Noh, Jin-Kyu Yang
APPLIED PHYSICS LETTERS
(2016)
Article
Physics, Multidisciplinary
Sungmook Kang, Heeso Noh
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2016)
Article
Physics, Multidisciplinary
Jihoon Na, Heeso Noh
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2018)
Article
Optics
Jihoon Choi, Heeso Noh
Article
Chemistry, Physical
Jin-Hyun Choi, Jehyeok Ryu, Hoang Minh Nguyen, Jihoon Choi, Heeso Noh, Seongpil Hwang, Jae-Won Jang
JOURNAL OF PHYSICAL CHEMISTRY C
(2019)
Article
Physics, Multidisciplinary
Jihoon Choi, Heeso Noh
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2019)
Article
Physics, Multidisciplinary
Jihoon Choi, Heeso Noh, Hyeri Jang, Jeong Seok Kang
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2020)
Article
Chemistry, Multidisciplinary
Seokho Kim, Chunzhi Cui, Jingyuan Huang, Heeso Noh, Dong Hyuk Park, Dong June Ahn
ADVANCED MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Jeong-Sik Jo, Jihoon Choi, Seung-Hoon Lee, Changhoon Song, Heeso Noh, Jae-Won Jang
Summary: The mass fabrication of 3D silicon microstructures with a 100 nm resolution is achieved using scanning probe lithography combined with metal-assisted chemical etching. Various protruding and recessed silicon structures are obtained via different lithography methods, demonstrating applications in nanoimprinting and PDMS stamps. Mass production of arbitrarily shaped silicon microparticles at submicrometer resolution is developed using silicon-on-insulator substrates, with applications in optical microresonators, surface-enhanced Raman scattering templates, and smart microparticles for fluorescence signal coding.
Article
Optics
Heeso Noh, Jai-Min Choi
Summary: Through simulations, we have identified two specific thickness combinations in a SiO2-Au-SiO2 layer structure that achieve one-way zero reflection at a wavelength of 560 nm. This was confirmed through reflection spectra showing zero reflectance for forwardly incident light and 2.5% reflectance for backwardly incident light at the specified wavelength and thickness combination.
Article
Physics, Multidisciplinary
Jihoon Choi, Heeso Noh
Summary: A novel method to generate a unidirectional source using simulation was developed in this study, reducing the interference between reflection from the structure and incident wave. Optimization led to an intensity ratio of up to 0.45% in the backward and forward directions of the unidirectional incident wave.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2021)
Article
Optics
Wisnu Hadibrata, Heeso Noh, Heming Wei, Sridhar Krishnaswamy, Koray Aydin
Summary: An innovative high-resolution compact spectrometer utilizing random scattering events in a disordered medium has been demonstrated, achieving a spectral resolution of 0.25 nm in the near-infrared regime. This compact spectrometer, with a small footprint of 30 x 12.8 µm², has great potential for various applications including on-chip spectrometer and sensing.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Jihoon Choi, Heeso Noh
Summary: In this study, single-port coherent perfect loss (CPL) was numerically demonstrated in a photonic crystal nanobeam using a Fabry-Perot resonator and a perfect magnetic conductor-like boundary. By designing and optimizing a simple Fabry-Perot resonator and coupler in the nanobeam, the researchers were able to achieve CPL with zero reflection in a single port. Adjustment of the lattice constant of the photonic crystal allowed for control of coupling loss in the resonator, ultimately leading to the successful realization of the CPL mode.
Article
Chemistry, Multidisciplinary
Mi-Sun Yang, Changhoon Song, Jihoon Choi, Jeong-Sik Jo, Jin-Hyun Choi, Byung Kee Moon, Heeso Noh, Jae-Won Jang
Article
Chemistry, Physical
Chang-Mok Oh, Ki Hong Park, Jin-Hyun Choi, Seongpil Hwang, Heeso Noh, Young Moon Yu, Jae-Won Jang
CHEMISTRY OF MATERIALS
(2017)
