Article
Chemistry, Multidisciplinary
Yuqiang Fang, Xin Feng, Dong Wang, Yang Ding, Tianquan Lin, Tianyou Zhai, Fuqiang Huang
Summary: Polarization-independent second harmonic generation has been achieved in van der Waals Nb3SeI7 crystals, which have a breathing Kagome lattice structure. The Nb3SeI7 crystals show a strong SHG response due to their noncentrosymmetric crystal structure. This work provides the first layered nonlinear optical crystal with polarization-independent SHG effect, opening up new possibilities for nonlinear optics.
Article
Materials Science, Multidisciplinary
Hendradi Hardhienata, Adalberto Alejo-Molina, Muhammad Danang Birowosuto, Amirreza Baghbanpourasl, Husin Alatas
Summary: This study reveals that in inversion-symmetric semiconductor materials, second harmonic generation (SHG) is attributed to surface dipole effects or bulk-related electric quadrupole or magnetic dipole effects after the disappearance of SHG from dipoles within the bulk. The results show that by incorporating the contribution from spatial dispersion, certain unexplained rotational anisotropy SHG intensity features for different incoming light wavelengths or optical penetration depths can be well reproduced.
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
Augustin Vernay, Veronique Boutou, Corinne Felix, David Jegouso, Florent Bassignot, Mathieu Chauvet, Benoit Boulanger
Summary: Birefringence phase-matched third-harmonic generation at 1594 nm was achieved for the first time in a KTiOPO4 single crystal micrometric ridge waveguide. The energy conversion efficiency reached 3.4% with a low pump energy of 2 mu J and pulse duration of 15 ps at a repetition rate of 10 Hz. Strong agreement between theory and experiments suggests potential for future triple photon generation quantum experiments.
Article
Optics
Jie Xu, Eric Plum, Vassili Savinov, Nikolay Zheludev
Summary: In this study, second harmonic generation was demonstrated using an amorphous silicon metamaterial fabricated on the tip of an optical fiber. The metamaterial is a double-chevron array that supports a closed-mode resonance for the fundamental wavelength at 1510 nm, with a quality factor of 30. The normalized resonant second harmonic conversion efficiency calculated per intensity and square of interaction length is approximately 10(-11) W-1, exceeding the previously achieved value for a silicon metamaterial by two orders of magnitude.
Article
Optics
Nirmal Kumar Das, Vit Kanclir, Pavel Mokry, Karel Zidek
Summary: The study investigated the origin of nonlinear optical second harmonic generation (SHG) in Si3N4 thin films using polarization-resolved angle-dependent measurements in reflective mode. It was found that, in addition to bulk SHG, the Si3N4-Si interface significantly contributes to SHG in thin samples.
Article
Chemistry, Physical
Natalie Fehn, Ehsan Vahidzadeh, Karthik Shankar, Ueli Heiz, Aras Kartouzian
Summary: This study presents the surface second harmonic generation spectra of supported gold nanoparticles with titania coating, which can provide additional information on the morphology and size distribution of the sample.
APPLIED SURFACE SCIENCE
(2022)
Article
Optics
Henri Pesonen, Juha-Matti Huusko, Xiaorun Zang, Ari T. Friberg, Jari Turunen, Tero Setala
Summary: This paper investigates the effects of nonlinear interaction on the spectral and temporal coherence of Gaussian Schell-model (GSM) pulses passing through a nonlinear optical crystal. The results show that the coherence of the fundamental and second-harmonic pulses may deviate from the theoretical model, and the coherence of the second-harmonic wave decreases with increasing intensity of the fundamental beam. Additionally, the transmitted second-harmonic wave may exhibit a double-peaked intensity distribution due to the partial coherence of the incident GSM field.
Article
Chemistry, Multidisciplinary
Bin Zhang, Jan E. Stehr, Ping-Ping Chen, Xingjun Wang, Fumitaro Ishikawa, Weimin M. Chen, Irina A. Buyanova
Summary: This study demonstrates highly efficient second-harmonic generation in subwavelength wurtzite (WZ) GaAs nanowires, providing an effective strategy for enhancing and manipulating the nonlinear optical response in nanowires through lattice engineering.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Yuan Zhang, Yangchun Tan, Yangda Dong, Liyufeng Dai, Chuanlai Ren, Fengyuan Zhang, Lingping Zeng, Feng An, Changjian Li, Boyuan Huang, Gaokuo Zhong, Jiangyu Li
Summary: The Materials Genome Initiative aims to accelerate the discovery, development, manufacture, and deployment of advanced materials. This study introduces a high-throughput scanning second-harmonic-generation microscope that enables rapid screening and probing of polar materials. The technique is applied to investigate ferroelectrics and demonstrate its high-throughput capabilities using compositional-gradient and thickness-gradient films.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yann Foucaud, Bertrand Siboulet, Magali Duvail, Alban Jonchere, Olivier Diat, Rodolphe Vuilleumier, Jean-Francois Dufreche
Summary: A breakthrough method has been developed to predict and interpret SHG signal at the atomic level, showing the significant impact of bulk quadrupole contribution in the SHG response. The experimental results are in unprecedented agreement with the simulated responses.
Article
Oncology
Joshua Hamilton, Anne Breggia, Timothy L. Fitzgerald, Michael A. Jones, Peter C. Brooks, Karissa Tilbury, Andre Khalil
Summary: This study aimed to explore the application of second harmonic generation and 2D wavelet transform modulus maxima anisotropy method in quantifying collagen organization in PDAC. The results showed that cancer and fibrotic tissue had higher anisotropy factors at small wavelet scales, while normal tissue had higher anisotropy factors at larger scales.
FRONTIERS IN ONCOLOGY
(2022)
Article
Multidisciplinary Sciences
Kunze Lu, Manlin Luo, Weibo Gao, Qi Jie Wang, Hao Sun, Donguk Nam
Summary: Despite the centrosymmetric nature of graphene, strain engineering can be used to manipulate its lattice arrangement and induce sublattice polarization, activating second harmonic generation (SHG). The SHG signal in strained graphene is boosted 50-fold at low temperatures due to resonant transitions between strain-induced pseudo-Landau levels. The second-order susceptibility of strained graphene exceeds that of hexagonal boron nitride with intrinsic broken inversion symmetry, opening up possibilities for high-efficiency nonlinear devices.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Multidisciplinary
Ozum Emre Asirim, Mustafa Kuzuoglu
Summary: The length of the interaction material along the beam propagation axis strongly affects the efficiency of second harmonic generation (SHGE). This study demonstrates that by adjusting the conduction-band electron density in a semiconductor nanomaterial under optical pumping, the SHGE can be effectively tuned from low to high. This tunability is only valid for small-scale materials, and the experimentally verified computational model shows unprecedented SHGE values for Ga-As and silicon nanomaterials.
NEW JOURNAL OF PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Bin Zhang, Yuqing Huang, Fuxiang Ji, Xiaohe Miao, Feng Gao, Weimin M. Chen, Irina A. Buyanova
Summary: We report the first observation of second harmonic generation (SHG) from halide double perovskite single crystals. The SHG efficiency of these materials with centrosymmetric crystalline structures is strongly dependent on the measurement temperature, increasing by up to 3 orders of magnitude at low temperatures under light illumination. The enhancement is attributed to the build-up of a light-induced electric field within the near-surface region.
Article
Physics, Multidisciplinary
Husin Alatas, Ahmad N. Aziz, Hendradi Hardhienata
Summary: In this report, we derive the Pauli equation for a spin-1/2 particle and discuss the possibility of constructing a bipartite Pauli equation for two nonlocal interacting spin-1/2 particles.
CHINESE JOURNAL OF PHYSICS
(2022)
Article
Polymer Science
Alexander Ebner, Robert Zimmerleiter, Kurt Hingerl, Markus Brandstetter
Summary: Recent developments in mid-infrared (MIR) spectroscopic ellipsometry with quantum cascade lasers (QCLs) have greatly improved the signal-to-noise ratio and reduced the acquisition time for high-resolution spectra, enabling real-time in-situ monitoring in polymer processing.
Article
Multidisciplinary Sciences
Hendradi Hardhienata, Salim Faci, Adalberto Alejo-Molina, Mohammad Ryan Priatama, Husin Alatas, Muhammad Danang Birowosuto
Summary: This study presents a novel theoretical analysis using the simplified bond hyperpolarizability model (SBHM) to approach the nonlinear tensor and compares it with group theory (GT). The analysis is based on a light-matter interaction classical phenomenological framework, requiring fewer independent parameters in the tensor than GT. This approach may open the path for similar analysis in other complex semiconductor surfaces and structures in the future, with potential applications to nanoscale surface characterization and real-time surface deposition monitoring.
Article
Materials Science, Multidisciplinary
Irzaman, Nurul Khomariah, Heriyanto Syafutra, Muhammad Nur Aidi, Husin Alatas, Hendradi Hardhienata
Summary: The study successfully deposited lithium niobate thin films on a silicon substrate using CSD and spin coating, exploring the impact of doping with lanthanum and niobium on the energy gap. The lithium niobate thin films exhibited a rhombohedral structure, with variations in energy gap due to different doping elements.
Article
Chemistry, Physical
Aditya Wibawa Sakti, Setyanto Tri Wahyudi, Faozan Ahmad, Noviyan Darmawan, Hendradi Hardhienata, Husin Alatas
Summary: The effect of salt concentration on the transport properties of water molecules was investigated, revealing that as the salt concentration increases, the ion-water interactions become stronger, resulting in a lower diffusivity and a lower electronic band gap. This suggests the high potential of superconcentrated aqueous-based electrolytes for sodium-ion battery applications.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Optics
Razvigor Ossikovski, Oriol Arteaga, Enrique Garcia-Caurel, Kurt Hingerl
Summary: An analytical model describing the polarimetric response of a depolarizing retarder with spatially varying retardance is presented, considering deterministic or random variations in the retarder parameters. The model provides mean values and uncertainties of the parameters, and its application is illustrated with experimental examples covering both deterministic and random cases.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
(2022)
Article
Multidisciplinary Sciences
Yael Gutierrez, Anna P. Ovvyan, Gonzalo Santos, Dilson Juan, Saul A. Rosales, Javier Junquera, Pablo Garcia-Fernandez, Stefano Dicorato, Maria M. Giangregorio, Elena Dilonardo, Fabio Palumbo, Mircea Modreanu, Josef Resl, Olga Ishchenko, Guy Garry, Tigers Jonuzi, Marin Georghe, Cornel Cobianu, Kurt Hingerl, Christoph Cobet, Fernando Moreno, Wolfram H. P. Pernice, Maria Losurdo
Summary: In this study, we investigated the structural change and optical contrast during the amorphous-to-crystalline transformation of antimony sulfide. We identified two crystallization regimes and proposed applications based on our findings.
Article
Chemistry, Physical
Liliana Tjahjana, Aurelien Olivier, Yuliati Herbani, Hendradi Hardhienata, Faozan Ahmad, Arramel, Dominik Kowal, Muhammad D. Birowosuto, Hong Wang
Summary: We successfully demonstrate the growth of gallium phosphide (GaP) segments within indium phosphide (InP) nanowires, forming GaP/InP heterostructure nanowires. The GaP segments show visible wavelength photoluminescence (PL) during growth, while the InP nanowires emit infrared light. PL mapping and polarization analysis reveal that the emission mainly comes from the GaP segments. The experimentally obtained band gap values are verified with band structure calculations. This study contributes to the tuning of emission and optical properties of GaP/InP nanowires for future applications in information and communication technology.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Optics
Yael Gutierrez, Dilson Juan, Stefano Dicorato, Gonzalo Santos, Matthias Duwe, Peter H. Thiesen, Maria M. Giangregorio, Fabio Palumbo, Kurt Hingerl, Christoph Cobet, Pablo Garcia-Fernandez, Javier Junquera, Fernando Moreno, Maria Losurdo
Summary: In this study, the dielectric function of crystalline 2H-GaS from monolayer to bulk was investigated through a combined theoretical and experimental approach. Spectroscopic imaging ellipsometry with micron resolution measurements and first principle calculations were used to determine the dielectric function. The applicability of the established dielectric function was further demonstrated through the analysis of the optical response of GaS layers grown by chemical vapor deposition. These findings provide guidance for the design of optoelectronic and photonic devices based on low-dimensional GaS.
Article
Physics, Applied
N. Rauch, E. Andersen, I. G. Vicente-Gabas, J. Duchoslav, A. Minenkov, J. Gasiorowski, C. Floetgen, K. Hingerl, H. Groiss
Summary: This study systematically investigated the impact of plasma treatment on Si wafers with native oxide using spectroscopic ellipsometry, revealing oxide growth, amorphization of crystalline Si, and the formation of a transition layer between SiO2 and amorphous Si. Nitrogen gas was found mainly implanted at the SiO2/transition layer interface in the form of Si3N4. The research concluded that a general ellipsometry model could be used for all plasma species due to low Si3N4 concentrations and its similarity in refractive index and absorption to SiO2.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
A. L. E. X. A. N. D. E. R. Ebner, M. A. R. K. U. S. Brunner, K. U. R. T. Hingerl, M. A. R. K. U. S. Brandstetter
Summary: The recent introduction of quantum cascade lasers (QCL) in infrared spectroscopic ellipsometry has significantly improved measurement times and signal-to-noise ratios, leading to the development of the first diffraction-limited micro-ellipsometry setup in the mid-infrared spectral range with a spatial resolution below 13.3 μm. Using the QCL's fast spectral tunability and phase-modulated polarization, broadband high-resolution hyperspectral Psi, Delta-cubes in the range of 900 cm(-1)-1204 cm(-1)) were simultaneously acquired in a scanning approach. The QCL micro-ellipsometer's spatial resolution was experimentally characterized and its capabilities demonstrated through the investigation of a polymer multilayer cross section and a 200-euro bank note.
Article
Chemistry, Multidisciplinary
Michael J. Haslinger, Oliver S. Maier, Markus Pribyl, Philipp Taus, Sonja Kopp, Heinz D. Wanzenboeck, Kurt Hingerl, Michael M. Muehlberger, Elena Guillen
Summary: Structural anti-reflective coating and bactericidal surfaces, as well as many other effects, rely on high-aspect-ratio (HAR) micro- and nanostructures, and thus, are of great interest for a wide range of applications. In this research, we developed a UV-based nanoimprint lithography process to master and replicate high-aspect-ratio nanopillars, achieving the smallest possible diameters for dense and isolated arrangements. The stability of the imprinted nanopillars was significantly improved by coating them with a 20 nm gold layer and an additional 20 nm thick layer of SiN. The UV-NIL replication of high-aspect-ratio nanopillars with tip diameters down to 35 nm was demonstrated for the first time, making them suitable for various applications.
Article
Engineering, Electrical & Electronic
Thomas Stoettinger, Bernhard Rebhan, Kurt Hingerl
Summary: This study investigates the impact of temperature, concentration, and oxide regrowth on the AlGe bonding layer during processing inside ultra-high vacuum. The results show that acceptable bonding results can be achieved below the eutectic temperature of 423 degrees C using in situ AlGe eutectic bonding process. Solid-state diffusion is sufficient to achieve high bonding quality even if the AlGe system remains in the solid state. The main feature of the bonding system, which is oxide removal while suppressing the oxide re-growth, enhances the quality of bonding compared to the regular ex situ eutectic bonding approach.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Chemistry, Analytical
Hendradi Hardhienata, Indra Ramdhani, Husin Alatas, Salim Faci, Muhammad Danang Birowosuto
Summary: This study presents a nonlinear phenomenological bond model analysis of second harmonic generation (SHG) in tetragonal ABO(3) structures using arbitrary input light polarization. The results show that the calculated SHG intensity profile aligns well with existing experimental data. Moreover, the study explores the effect of the incoming light polarization on the SHG intensity peak and the number of peaks. The research also highlights the contribution of spatial dispersion to the total SHG intensity. The findings provide insights into the nonlinear properties and photovoltaic performance of ABO(3) structures.
