Article
Engineering, Electrical & Electronic
Tamar Haimov, Koray Aydin, Jacob Scheuer
Summary: The proposed approach utilizes an active VO2 layer and a Bragg reflector to achieve dynamic holography at optical frequencies; a reconfigurable metasurface for tunable binary holography is proposed and analyzed; the device can also function as a broad-angle perfect absorber when tuned to the proper temperature.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Physics, Applied
Fangqi Chen, Yang Liu, Xiaojie Liu, Yi Zheng
Summary: Conventional thermal emission relies on micro/nanostructures to achieve spectral selectivity, but lacks flexibility in terms of thermal emissivity. In this Letter, we propose a multistate multilayered structure using phase change materials, which offers tunable spectra in the mid-infrared range. The structure is lithography-free and industrially scalable, showing great potential for programmable photonics and thermal sensors.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ziquan Xu, Hao Luo, Huanzheng Zhu, Yu Hong, Weidong Shen, Jianping Ding, Sandeep Kaur, Pintu Ghosh, Min Qiu, Qiang Li
Summary: This study demonstrates a nonvolatile optically reconfigurable mid-infrared coding radiative metasurface, which allows for switching peak spectral emissivity values between low and high through laser pulses. Additionally, visible scattering patterns can be independently modulated, showing potential applications in anti-counterfeiting labels and other fields.
Article
Nanoscience & Nanotechnology
Sina Abedini Dereshgi, Maria Cristina Larciprete, Marco Centini, Akshay A. Murthy, Kechao Tang, Junqiao Wu, Vinayak P. Dravid, Koray Aydin
Summary: The research shows that the tunability of optical phonons in a-MoO3 with VO2 multilayer structure can help design tunable photonic devices for infrared applications, such as tunable camouflage and radiative cooling devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Hongyu Guo, Lirui Si, Jianyong Yu, Xueli Wang, Yang Si
Summary: A sol epitaxial fabrication strategy was developed to create metal-insulator transition nanofibers (MIT-NFs), which could be further assembled into self-standing two-dimensional membranes and three-dimensional aerogels with structural robustness. The resulting MIT materials exhibited solid-solid phase change properties, while maintaining shape stability and thermal reallocation properties. This research provides new perspectives for next-generation, shape-stable, and self-standing PCMs.
Article
Nanoscience & Nanotechnology
Jimmy John, Amine Slassi, Jianing Sun, Yifei Sun, Romain Bachelet, Jose Penuelas, Guillaume Saint-Girons, Regis Orobtchouk, Shriram Ramanathan, Arrigo Calzolari, Sebastien Cueff
Summary: In this study, we demonstrate theoretically and experimentally a strong and tunable optical anisotropy in epitaxially-grown VO2 thin films. We reveal that these films exhibit an ultra-large birefringence through a combination of temperature-dependent X-ray diffraction, spectroscopic ellipsometry measurements, and first-principle calculations. Moreover, by leveraging the insulator-to-metal transition of VO2, we demonstrate a dynamic reconfiguration of optical properties from birefringent to hyperbolic, opening avenues for multi-functional devices with tunable anisotropy and hyperbolic dispersion.
Article
Optics
Jin-Kyu Yang, Hyeon-Seok Jeong
Summary: Researchers have successfully demonstrated switchable metasurfaces using phase change material VO2 by temperature change, showing various functionalities such as polarization conversion, beam steering, Fourier hologram, and Fresnel hologram. The thin-VO2-film-based metasurface has potential applications in temperature-dependent optical sensors and displays.
Letter
Optics
Jorge Parra, Juan Navarro-Arenas, Mariela Menghini, Maria Recaman, Jean Pierre-Locquet, Pablo Sanchis
Summary: This work presents an optical limiter based on silicon photonics with an ultracompact VO2/Si waveguide, featuring a thermal tunable threshold power of only about 3.5 mW and broadband spectral characteristics. It offers a new pathway towards integrated optical limiters for dense and low-power photonic integrated circuits.
Article
Energy & Fuels
Kaihao Bai, Chuanchang Li, Baoshan Xie, Dongyao Zhang, Youfu Lv, Junbing Xiao, Meizhi He, Xiaoliang Zeng, Julan Zeng, Jian Chen
Summary: In this study, a novel PEG/VO2 dual phase change material with phase transition temperature gradients was prepared using the vacuum impregnation method. Expanded graphite was introduced to improve the stability and thermal conductivity of the material. The results showed that the PEG/VO2/EG material had high thermal storage capacity and thermal conductivity, and a faster response to ambient temperature. It also showed potential for thermal management of lithium-ion batteries.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2022)
Article
Nanoscience & Nanotechnology
Tongtong Kang, Zongwei Ma, Jun Qin, Zheng Peng, Weihao Yang, Taixing Huang, Shilin Xian, Shuang Xia, Wei Yan, Yucong Yang, Zhigao Sheng, Jian Shen, Chaoyang Li, Longjiang Deng, Lei Bi
Summary: This study reports on active metasurfaces based on Au/VO2, which exhibit high performance in optical modulation. These metasurfaces, fabricated by self-assembly, demonstrate high transparency, high power efficiency, ultrafast switching speed, and large-scale manufacturing capability, making them suitable for ultrafast optical modulation applications.
Article
Chemistry, Multidisciplinary
Mousa Bahrami, Panagiotis Vasilopoulos
Summary: We studied the influence of VO2 on plasmons in metallic AGNRs and assessed the effect of temperature on the plasmon modes. The results show that AGNRs support localized and propagating plasmon modes, and the presence of VO2 affects intra-band transitions, but neglects the influence of a substrate-induced band gap.
Article
Nanoscience & Nanotechnology
Tongtong Kang, Zongwei Ma, Jun Qin, Zheng Peng, Weihao Yang, Taixing Huang, Shilin Xian, Shuang Xia, Wei Yan, Yucong Yang, Zhigao Sheng, Jian Shen, Chaoyang Li, Longjiang Deng, Lei Bi
Summary: This paper reports on active metasurfaces based on Au/VO2 that demonstrate high transparency, high power efficiency, ultrafast switching, and large-scale fabrication capability. Fabricated using polystyrene sphere colloidal crystal self-assembly, these centimeter-scale Au/VO2 metasurfaces exhibit excellent optical modulation performance in static heating experiments and ultrafast pump-probe experiments. The alignment of surface plasmon resonance wavelength with the pump wavelength enables swift switching effects, showcasing a practical approach to fabricating large-scale and power-efficient active metasurfaces for ultrafast optical modulation.
Article
Neurosciences
Juan Nunez, Maria J. Avedillo, Manuel Jimenez, Jose M. Quintana, Aida Todri-Sanial, Elisabetta Corti, Siegfried Karg, Bernabe Linares-Barranco
Summary: A new architecture for ONNs based on VO2 devices is proposed in this study, using SHIL to ensure each neuron's phase information can only take two values. Compared to conventional interconnection schemes, this architecture offers better robustness and tolerance.
FRONTIERS IN NEUROSCIENCE
(2021)
Article
Multidisciplinary Sciences
Mojtaba Karimi Habil, Carlos J. Zapata-Rodriguez, Mauro Cuevas, Samad Roshan Entezar
Summary: This research introduces an axisymmetric silicon nanoresonator with a designed tapered angle to enhance the decay rate of magnetic dipole emitters significantly. By tuning the resonator diameter and the taper angle of the blind hole, the Purcell factor and resonance frequency can be conveniently adjusted.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Riad Yahiaoui, Zizwe A. Chase, Chan Kyaw, Eric Seabron, Jay Mathews, Thomas A. Searles
Summary: The research demonstrates a single-layer THz metadevice that can achieve cross polarization transmission and asymmetric transmission in the THz range. The transmission characteristics change with the conductivity of the material VO2, and a promising method for active sub-cycle dynamic tunability for THz polarization conversion using optical, electrical, or thermal switching is proposed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yael Gutierrez, Maria Losurdo, Iris Prinz, Adrian Prinz, Georg Bauer, Maria Bauer, Martina M. Schmidt, Thorsten Schaller
Summary: This paper demonstrates the design and industrial manufacturing process of reliable and cost-effective disposable SERS microfluidic chips using high throughput technologies. These chips exhibit high SERS enhancement and stability, making them suitable for customizable and cost-effective disposable point-of-care diagnostic applications.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Optics
Javier Gonzalez-Colsa, Guillermo Serrera, Jose Maria Saiz, Dolores Ortiz, Francisco Gonzalez, Fernando Bresme, Fernando Moreno, Pablo Albella
Summary: This study compares the thermoplasmonic response of different nanoparticle geometries and finds that doughnut-shaped nanoparticles have a superior tunable photothermal response under practical illumination conditions. The heating of nanoparticles in fluidic environments strongly depends on the particle orientation with respect to the illumination source. It is concluded that nanodoughnuts are the best nanoheaters with weak dependence on orientation, making them ideal for photothermal therapy applications.
Article
Materials Science, Multidisciplinary
Yael Gutierrez, Andrea Fernandez-Perez, Saul A. Rosales, Cornel Cobianu, Marin Gheorghe, Mircea Modreanu, Jose M. Saiz, Fernando Moreno, Maria Losurdo
Summary: In this study, imaging polarimetry and spectroscopic ellipsometry were used to reveal and directly measure the optical properties of Sb(2)S(3) in crystalline and amorphous states. The results show that Sb(2)S(3) crystallites exhibit strong anisotropy and low losses, while the amorphous films are optically isotropic.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Stefano Dicorato, Yael Gutierrez, Maria M. Giangregorio, Fabio Palumbo, Giuseppe Bianco, Maria Losurdo
Summary: In this study, GaS samples of various thicknesses were obtained and the interplay between structural, morphological, optical, and photoresponsivity properties as a function of thickness was investigated. The results showed that the photoresponsivity of GaS increases with thickness and remains stable over multiple on/off cycles.
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
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
Optics
Gonzalo Santos, Marin Georghe, Cornel Cobianu, Mircea Modreanu, Maria Losurdo, Yael Gutierrez, Fernando Moreno
Summary: This paper presents a reconfigurable photodetector based on a metal-semiconductor configuration, utilizing hot-carrier and surface plasmons (SPs) hot-electron injection into semiconductors for narrowband photoresponse and sub-bandgap energy photodetection. By numerically studying the parameters of the dual-comb Au electrodes and the SP order, the absorption of the device is optimized, enabling tunable narrowband photodetection from the O telecom band to the C telecom band.
Article
Chemistry, Analytical
Maria Carcelen, Veronica Vidal, Alfredo Franco, Marcos Gomez, Fernando Moreno, Jose L. Fernandez-Luna
Summary: This article introduces a simple, fast and label-free method based on a gold nanohole array biosensor to detect the spectral response and changes in cell-matrix adhesion of cancer cells. The experimental results show that this biosensor can effectively distinguish different cell populations in the cell cycle and detect changes in cell-matrix interaction in real time.
Article
Chemistry, Multidisciplinary
Gonzalo Santos, Maria Losurdo, Fernando Moreno, Yael Gutierrez
Summary: All-dielectric metasurfaces are nanopatterned structures that have various applications and their optical behavior is determined by composition, dimensions, and environment. However, their functionality is fixed during fabrication, limiting their potential as reconfigurable devices. A reconfigurable all-dielectric metasurface based on high refractive index materials is proposed, which can control scattered light through phase-change chalcogenide antimony triselenide. The device consists of a 2D array of sandwich disks embedded in a SiO2 matrix.
Article
Chemistry, Analytical
Victor Garcia-Milan, Alfredo Franco, Margarita Estreya Zvezdanova, Sara Marcos, Ruben Martin-Laez, Fernando Moreno, Carlos Velasquez, Jose L. Fernandez-Luna
Summary: A nanostructured gold biosensor was used to distinguish between tumor tissue and peritumoral tissue in GBM patients based on differences in their optical properties. The biosensor showed a high sensitivity and specificity in discriminating between the two tissues, making it a potential tool for real-time intraoperative discrimination.
Article
Materials Science, Multidisciplinary
Yael Gutierrez, Gonzalo Santos, Fabio Palumbo, Mircea Modreanu, Fernando Moreno, Maria Losurdo
Summary: In this study, the reversible non-volatile transition of molybdenum oxides was experimentally demonstrated, and its optical properties were investigated. The research results highlight the potential applicability of molybdenum oxides in metal-insulator transitions.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Xavier Letartre, Serge Mazauric, Taha Benyattou, Hai Son Nguyen, Pierre Viktorovitch
Summary: We present a general theoretical approach based on a non-Hermitian Hamiltonian to model the complex dispersion characteristics of leaky optical modes in photonic crystal slabs. This approach allows for a unified description of various optical modes generated in one-dimensional photonic crystals and can facilitate the manipulation of bound states in the continuum, exceptional points, and the discovery of novel photonic species. As a proof of concept, we experimentally demonstrate the formation of a Dirac point at the merging of three bound states in the continuum, which represents the most significant achievement discussed in this work.
