Article
Materials Science, Multidisciplinary
Andrew Butler, Christos Argyropoulos
Summary: In this work, the unique properties of a plasmonic Huygens' metasurface composed of active metal-dielectric core-shell nanoparticles are analyzed. The reflection and transmission coefficients of the metasurface are calculated under various levels of gain, demonstrating the existence of reflectionless transmission when an exceptional point is formed. The proposed new active metasurface design, with subwavelength thickness, can be used to realize ultracompact perfect transmission optical filters.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Physics, Multidisciplinary
Kobi Frischwasser, Kobi Cohen, Shai Tsesses, Shimon Dolev, Gilad Rosenblatt, Guy Bartal
Summary: This study reveals the nonlinear forced response of modal-nonmodal pairs of short-range surface plasmons in thin metal films using a nonradiating nonlinear source. Nonlinearly mediated direct access to nonmodal plasmons in a lossless regime is achieved. The findings can be applied to other forms of surface waves or optical nonlinearities for on-chip nonlinearly controlled nanophotonic devices.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Chang Hyeon Song, Maulida Zakia, Geon Seok Lee, Seong Il Yoo
Summary: The study explored the application of plasmonic superstructures in converting solar energy into other forms of energy, achieving more efficient photothermal conversion through the scattering-mediated absorption process in porous polymer membranes, and accelerating the kinetics of chemical reactions.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Multidisciplinary
Anton Yu. Bykov, Yuanyang Xie, Alexey V. Krasavin, Anatoly V. Zayats
Summary: In this study, the optically driven acoustic modes and nonlinear response of multilayered spherical plasmonic hetero-nanoparticles were investigated. These nanoparticles, composed of alternating layers of gold and silica, exhibited a broadband nonlinear optical response from visible to near-infrared wavelengths. Additionally, they served as a tunable optomechanical system with mechanically decoupled layers, allowing for selective switching of different acoustic modes by tuning the excitation wavelength. These findings not only enhance our understanding of the internal structure of composite plasmonic nanoparticles but also provide an additional degree of freedom for controlling their nonlinear optical and mechanical properties.
Article
Engineering, Electrical & Electronic
Weidong Zhang, Hung Chiang, Te Wen, Lulu Ye, Hai Lin, Haitan Xu, Qihuang Gong, Guowei Lu
Summary: Coupled plasmonic systems are of interest for their optical properties and potential applications. An improved method for mapping geometric configurations to optical properties accurately is developed, allowing for the realization of low-loss cavity and interesting effects in metallic nanoparticles. Asymmetric coupling is predicted to lead to chirality and directional energy transfer in hybrid plasmonic systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Sujin Jiracheewanun, Michael B. Cortie, Dakrong Pissuwan
Summary: In this study, the generation and transfer of heat when laser irradiation is applied to water containing gold nanorods coated with different polyelectrolytes were investigated. Experimental measurements were compared to a finite element model. It was observed that high fluences are required to produce biologically relevant temperature changes due to significant lateral heat transfer from the well sides. A 650 mW continuous-wave laser with a wavelength similar to the gold nanorods' longitudinal plasmon resonance peak can deliver heat with an overall efficiency of up to 3%, which is double the efficiency without the nanorods. An increase in temperature of up to 15 degrees C, suitable for inducing cell death by hyperthermia, can be achieved. The nature of the polymer coating on the gold nanorods has only a small effect.
Article
Materials Science, Multidisciplinary
Jingjing Guo, Ce Shang, Shuo Gao, Yongbiao Zhang, Bo Fu, Lijun Xu
Summary: A flexible optical tactile sensor is developed using a plasmonic optical fiber made from gold nanoparticles and elastomers. It can accurately sense contact force and convert mechanical stimuli into interpretable light signals with low hysteresis and adjustable sensitivity. The sensor is capable of real-time monitoring of blood pressure, respiration, and tactile mapping of hand motions.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Review
Pharmacology & Pharmacy
Ying Wu, Kang Zhu, Xuan Zhang, Wei Du, Jibin Song, Huanghao Yang
Summary: Plasmonic nanoparticles and their assemblies have been widely used in biosensing, optical imaging, and biomedicine. In the field of radiotherapy, plasmonic nanomaterials with high-Z properties have the ability to sensitize radiotherapy. Assembled structures with tunable properties have versatile applications in drug delivery and cancer treatment. This review focuses on the use of plasmonic nanoparticles and their assemblies in cancer radiotherapy, discussing the sensitization mechanism and recent progress in this field, as well as the current challenges and future perspectives.
ADVANCED DRUG DELIVERY REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Florian Spreyer, Jungho Mun, Hyeohn Kim, Ryeong Myeong Kim, Ki Tae Nam, Junsuk Rho, Thomas Zentgraf
Summary: The study found that helicoid-III nanoparticles exhibit strong chiroptical responses in both the linear and nonlinear optical regime, and these responses can be quantified through calculations. The results demonstrate that the chirality of the helicoid-III nanoparticles is significantly enhanced in the nonlinear regime.
Review
Optics
K. Monisha, K. Suresh, Sajan D. George
Summary: The conversion of light to heat via the photothermal effect has been used to evaluate thermo-optic properties of materials, but recently it has also been used for the manipulation of colloidal objects and living cells. Optothermal manipulation techniques utilize lower optical power and can manipulate particles over a long range compared to conventional optical tweezers. This review discusses the working mechanisms, concepts, and applications of recently established optothermal techniques, as well as the physical mechanisms behind the optical manipulation.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Qiushi Zhang, Ruiyang Li, Eungkyu Lee, Tengfei Luo
Summary: The study reveals that NPs deposited on the transparent substrate by optical forces play a key role in the nucleation of photothermal surface bubbles. The formation of surface bubbles is influenced by the different laser power density thresholds depending on whether the surface is facing or facing away from the light propagation direction.
Article
Green & Sustainable Science & Technology
Xiyu Yu, Maoquan Huang, Xinyu Wang, Qie Sun, G. H. Tang, Mu Du
Summary: This study introduces an optical selectivity aerogel by doping with gold/silver nanoparticles and predicts its radiative properties. The results show that the morphology, aspect ratio, size, and doping concentration of nanoparticles significantly affect the spectral selectivity of the hybrid aerogels.
Article
Nanoscience & Nanotechnology
Rong Rong, Yang Li, Mingjie Wang, Yutao Tang, Hongjie Xu, Kingfai Li, Guixin Li, Tun Cao, Shumei Chen
Summary: Recent studies have found that optical vortices with on-demand angular momentum can be generated using geometric phase-controlled metasurfaces. However, these optical vortices have two spin-locked orbital angular momentum states that are difficult to distinguish. This study proposes a method to generate and spatially separate spin-locked second-harmonic vortex beams using phase gradient plasmonic metasurfaces.
Article
Chemistry, Physical
Tulio L. de Pedrosa, Georges Boudebs, Renato E. de Araujo
Summary: This work reveals the rules of using figures of merit to select efficient plasmonic nanoheaters. The size dependence of plasmonic nanoparticle optical heating was disclosed, and the optimal gold nanospheres diameter for efficient colloidal laser heating was identified as 50 nm. Moreover, it was found that the optimal particle size for single-particle optical heating applications is different from the optimal size for collective heating of nanoparticles.
Article
Multidisciplinary Sciences
Pablo Cencillo-Abad, Daniel Franklin, Pamela Mastranzo-Ortega, Javier Sanchez-Mondragon, Debashis Chanda
Summary: All current commercial colors are pigment-based, which have limitations such as fading, instability in atmosphere, and environmental toxicity. The development of artificial structural coloration has been hindered by the lack of design ideas and impractical nanofabrication techniques. However, a self-assembled subwavelength plasmonic cavity has been presented as a solution to these challenges, allowing for angle and polarization-independent vivid structural colors. This platform, fabricated through large-scale techniques, offers a lightweight paint option with full coloration using just a single layer of pigment.
Article
Computer Science, Artificial Intelligence
Stephanie Guerit, Siddharth Sivankutty, John Lee, Herve Rigneault, Laurent Jacques
Summary: Fluorescence imaging through ultrathin fibers is a promising approach to achieve high-resolution imaging at greater depths. This study proposes a novel scanning scheme called partial speckle scanning, inspired by compressive sensing theory, to perform lensless endoscopy with reduced acquisition time and without photo-bleaching. The proposed approach utilizes the subexponential random fields of speckles and the memory effect of multicore fibers to achieve higher reconstruction quality with fewer observations.
SIAM JOURNAL ON IMAGING SCIENCES
(2022)
Article
Optics
D. Septier, V Mytskaniuk, R. Habert, D. Labat, K. Baudelle, A. Cassez, G. Brevalle-Wasilewski, M. Conforti, G. Bouwmans, H. Rigneault, A. Kudlinski
Summary: We present a highly multimodal nonlinear micro-endoscope with a diameter of 2 mm, which enables label-free imaging of biological tissues. The micro-endoscope utilizes double-clad antiresonant hollow core fiber and graded-index fiber technology, allowing for various imaging modes and achieving high-resolution images.
Article
Nanoscience & Nanotechnology
Fatima El Moussawi, Matthias Hofer, Damien Labat, Andy Cassez, Geraud Bouwmans, Siddharth Sivankutty, Rosa Cossart, Olivier Vanvincq, Herve Rigneault, Esben Ravn Andresen
Summary: This study presents a novel tapered multicore fiber (MCF) component for ultraminiaturized endoscopes, addressing the power delivery issue faced by MCF-based lensless endoscopes and achieving a significant increase in two-photon signal yield.
Article
Optics
Sandro Heuke, Xavier Audier, Herve Rigneault
Summary: A double modulation scheme is proposed for stimulated Raman microscopy, where both the pump and Stokes beams are modulated at fm and 2fm. By exploiting aliasing and reduction of repetition rate, the proposed scheme amplifies the signal amplitude by a factor of 1.5, 2, and 4 for different modulation frequencies and experimental realizations at the same average power. The derived noise power for different sources shows that the double modulation scheme can achieve up to 16-fold speed improvement in stimulated Raman scattering imaging compared to single beam modulation.
Review
Nanoscience & Nanotechnology
Guillaume Baffou
Summary: This Review discusses a cutting-edge wavefront imaging technique called quadriwave lateral shearing interferometry (QLSI) that utilizes a 2-dimensional diffraction grating in front of a regular camera. The working principle and implementation of QLSI on an optical microscope are detailed. The microscopy applications of QLSI in bioimaging and nanophotonics for the characterization of various samples are highlighted. A critical comparison between QLSI and current quantitative phase microscopy techniques is also presented.
Article
Chemistry, Physical
Romain Appay, Barbara Sarri, Sandro Heuke, Sebastien Boissonneau, Chang Liu, Etienne Dougy, Laurent Daniel, Didier Scavarda, Henry Dufour, Dominique Figarella-Branger, Herve Rigneault
Summary: Central nervous system tumors are a diverse group of neoplasms with different outcomes and treatment strategies. The classification of these tumors is now based on molecular parameters in addition to histopathology. Genomic characterization is crucial for identifying targeted therapies. Stimulated Raman histology (SRH) is a non-destructive imaging technique that allows for rapid examination of tissue samples without labeling or sectioning.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Optics
Zhouping Lyu, Ksenia Abrashitova, Johannes F. de Boer, Esben R. Andresen, Herve Rigneault, Lyubov Amitonova
Summary: In this study, a flexible probe based on a multicore-multimode fiber is proposed and experimentally demonstrated for sub-diffraction imaging. The probe consists of a multicore part with 120 single-mode cores and a multimode part for structured light illumination. The results show perturbation-resilient fast sub-diffraction fiber imaging by computational compressive sensing.
Article
Optics
Jeremy Saucourt, Antonin Moreau, Julien Lumeau, Herve Rigneault, Thomas Chaigne
Summary: Optical detection of ultrasound for photoacoustic imaging using Fabry-Perot cavity sensors allows for higher spatial resolutions compared to conventional piezoelectric detection. However, precise control of the interrogation beam wavelength is required for optimal sensitivity. This study proposes the use of a broadband source and a fast-tunable acousto-optic filter to adjust the interrogation wavelength at each pixel within microseconds, overcoming fabrication constraints and improving acquisition speed.
Article
Optics
Naveen Gajendra Kumar, Siddharth Sivankutty, Victor Tsvirkun, Andy Cassez, Damien Labat, Rosa Cossart, Geraud Bouwmans, Esben Ravn Andresen, Herve Rigneault
Summary: We present a modified fiber geometry for a bending-insensitive multi-core fiber (MCF) that allows optimal light coupling in and out of the individual cores, addressing the coupling complexity and potential degradation issues of previously reported twisted MCFs. By introducing a section with straight and parallel cores at the ends of the MCF, we rectify the coupling and output light problems, enabling the development of bend-insensitive lensless endoscopes.
Article
Nanoscience & Nanotechnology
Elena Mikheeva, Remi Colom, Patrice Genevet, Frederic Bedu, Igor Ozerov, Samira Khadir, Guillaume Baffou, Redha Abdeddaim, Stefan Enoch, Julien Lumeau
Summary: With laser-annealing technology, we propose a novel approach to design and fabricate phase-gradient Huygens metasurfaces by using uniform particles made of As2S3 chalcogenide glass. Instead of tuning the geometry, we realize a phase gradient metasurface by tuning the refractive index of identical meta-atoms. By locally changing the refractive index of As2S3 particles using short-wavelength illumination, we can adjust the phase pattern of the metasurface after fabrication. The potential advantages of our method for low-cost mass production of large-scale metasurfaces lie in the use of uniform geometries.
Article
Physics, Applied
Siddarth Shivkumar, Dekel Ranann, Samuel Metais, Sisira Suresh, Nicolas Forget, Randy Bartels, Dan Oron, Herve Rigneault
Summary: Impulsive stimulated Raman scattering (ISRS) is a promising technique for vibrational imaging below 200 cm(-1) by using a single short femtosecond pump pulse. However, ISRS lacks vibrational selectivity as all vibrational bonds within the pump-pulse bandwidth are excited. In this work, we propose two pulse-shaping strategies for selective vibrational detection by shaping the probe pulse in time.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Camille Scotte, Frederic Galland, Herve Rigneault
Summary: In a single-pixel camera, the object is illuminated by intensity patterns and reconstructed computationally from the total reflected or transmitted intensity measured by a single-pixel detector. We investigate whether a single-pixel camera performs better than point raster scanning in the presence of photon-noise, and find that positive intensity modulation based on Hadamard or Cosine patterns does not necessarily improve the single-to-noise ratio (SNR) of single-pixel cameras. However, the SNR is improved on object pixels at least k times brighter than the object mean signal, where k depends on the modulation scheme.
JOURNAL OF PHYSICS-PHOTONICS
(2023)
Article
Biophysics
Maelle Benefice, Aurore Gorlas, Baptiste Marthy, Violette Da Cunha, Patrick Forterre, Anne Sentenac, Patrick C. Chaumet, Guillaume Baffou
Summary: Quantitative phase microscopy (QPM) is a noninvasive method that provides high contrast cell observation and quantitative measurement of dry mass (DM) and growth rate at the single-cell level. This article demonstrates the use of high-resolution and high-sensitivity cross-grating wavefront microscopy for accurate DM measurement of bacteria and archaea. The article also introduces the concepts of normalized optical volume and optical polarizability (OP) to gain additional information beyond DM.
BIOPHYSICAL JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
D. Septier, D. Labat, A. Pastre, R. Bernard, G. Brevalle-Wasilewski, H. Rigneault, G. Bouwmans, A. Kudlinski
Summary: We designed, fabricated, and characterized the first hollow core double-clad fiber coupler for nonlinear micro-endoscopy. The coupler consists of a pure silica negative curvature hollow core double-clad fiber and a highly multimode fiber fused together. The use of a low fusion temperature soft (borosilicate) glass multimode fiber enabled the fabrication of this coupler without altering the geometry of the negative curvature fiber. A power transfer of 60% from the double-clad fiber to the multimode fiber was measured at 500 nm. The applicability of the coupler was demonstrated through two-photon fluorescence and second harmonic generation imaging of unlabeled biological tissues using an endoscopic head mounted on the hollow core double-clad fiber coupler. This device greatly simplifies the integration of nonlinear micro-endoscopes based on hollow core double clad fibers.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Sandro Heuke, Carla Silva Martins, Remi Andre, Loic Legoff, Herve Rigneault
Summary: Two-photon excited fluorescence (2PEF) microscopy is a popular nonlinear imaging method for biomedical samples. It uses multiple detectors and spectral filter sets to discriminate different fluorophores based on their emission behavior. However, 2PEF suffers from the loss of fluorescence photons outside the filter transmission range and may fail to discriminate fluorophores with similar emission profiles. Here, we propose an alternative 2PEF method that discriminates fluorophores based on their excitation spectra.
