Article
Chemistry, Physical
Jian Zhu, Shu-min Zhao
Summary: This study investigated the local dielectric constant-dependent fluorescence quenching of gold nanoshell using quasi-static electrodynamics theory and FRET. It was found that the quenching efficiency is related to the dielectric constants of the outer surrounding and inner core, and can be fine tuned by altering the local dielectric environment.
Article
Materials Science, Multidisciplinary
Lixin Zang, Wenhao Shao, Onas Bolton, Ramin Ansari, Seong Jun Yoon, Jung-Moo Heo, John Kieffer, Adam J. Matzger, Jinsang Kim
Summary: This study investigates the dual phosphorescence emission characteristics and the effect of the environment on pure organic phosphors. The results show that the emission of pure organic phosphors gradually red-shifts with increasing solvent polarity, which is related to the T-1 to T-2 energy level conversion. Additionally, the decay curves and decay rates of pure organic phosphors vary depending on the matrix they are in.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Kyu Ri Choi, Shilong Li, Igor Ozerov, Frederic Bedu, Dong Hee Park, Bin Chan Joo, Jeong Weon Wu, Sile Nic Chormaic, Yeon Ui Lee
Summary: This study presents a systematic investigation of fluorescence engineering in metamaterial-assisted localization microscopy using cyclic group metasurfaces coated with a fluorescent film. The spatially varied Purcell effect near these metasurfaces leads to tailored variations in the photoluminescence intensity and photobleaching lifetime of fluorophores. The enhanced emissions and blinking dynamics of the fluorophores on these metasurfaces result in a super-resolution localization image with a localization accuracy of 0.9 nm.
Review
Optics
Leonid Yu. Beliaev, Osamu Takayama, Pavel N. Melentiev, Andrei V. Lavrinenko
Summary: Photoluminescence, including fluorescence, is crucial in various applications from biomedical sensing to optoelectronics. Hyperbolic metamaterials (HMMs) are highly anisotropic materials that enhance photoluminescence naturally in dye molecules, quantum dots, diamond nitrogen-vacancy centers, perovskites, and transition metal dichalcogenides.
OPTO-ELECTRONIC ADVANCES
(2021)
Article
Multidisciplinary Sciences
L. D. Stanfield, A. W. Powell, S. A. R. Horsley, J. R. Sambles, A. P. Hibbins
Summary: We experimentally demonstrate a Purcell effect-based design technique to improve the impedance matching and reflection coefficient of a small microwave emitter. By comparing the radiated field phase in air and in a dielectric environment, we optimize the structure of a dielectric hemisphere above a ground plane, resulting in a significant increase in radiation efficiency. The optimized system exhibits strong coupling with two omnidirectional radiation modes at 1.99 GHz and 2.84 GHz, achieving Purcell enhancement factors of 1762 and 411 times, respectively, and near perfect radiation efficiency.
SCIENTIFIC REPORTS
(2023)
Article
Optics
C. K. Jiang, J. H. Li, Z. H. Han, Y. Ma, Y. Q. Ma
Summary: The study introduces a novel double-nanohole-assisted cavity structure which can enhance the Purcell factor up to 6.5 x 10(4) over the visible spectrum, offering new opportunities for integrated quantum circuits with single-photon emitters.
Article
Chemistry, Multidisciplinary
Sascha Kolatschek, Cornelius Nawrath, Stephanie Bauer, Jiasheng Huang, Julius Fischer, Robert Sittig, Michael Jetter, Simone Luca Portalupi, Peter Michler
Summary: The combination of semiconductor quantum dots with photonic cavities has shown promising results in achieving nonclassical light sources with high brightness, indistinguishability, and repetition rate. By coupling InGaAs/GaAs QDs to a circular Bragg grating cavity, enhancements in geometric extraction efficiency and brightness have been demonstrated under different excitation conditions. Through p-shell pumping, high count rates with pure single-photon emission have been achieved, along with good single-photon purity at temperatures of up to 77 K.
Article
Multidisciplinary Sciences
Vicente Robles, Juan Carlos Gonzalez-Parra, Natanael Cuando-Espitia, Guillermo Aguilar
Summary: This study investigates the effect of gas-entrapping PDMS microstructures on the dynamics of cavitation bubbles and demonstrates the potential to direct the collapse of a cavitation bubble away from a surface to mitigate erosion or enhance microfluidic mixing in low Reynolds number flows.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Multidisciplinary
Xianzhen Xu, Davood Shahsavari, Behrouz Karami
Summary: This paper investigates the forced vibration response of doubly-curved shells with different shape panels, using a powerful shear-deformation theory and a nonlocal strain gradient theory. By estimating effective material properties and applying virtual work principles, governing equations and boundary conditions are obtained, followed by an analytical technique to analyze the dynamic response of nano-panels.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Chemistry, Physical
Bebeto Rai, Dominik Suter, Venkatesh Srinivasan, Koushik Venkatesan, Sai Sathish Ramamurthy
Summary: The study introduces a surface plasmon-coupled phosphorescence (SPCP) technique using excimer-forming N-heterocyclic carbene platinum(II) complexes with alkyne derivatives. The research demonstrates up to 18-fold enhancement in phosphorescence emission without complex plasmonic architectures. The study also shows the alteration of dispersive behavior for these complexes and the achievement of augmented emission.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Mechanics
Mostafa Habibi, Alireza Mohammadi, Hamed Safarpour, Majid Ghadiri
Summary: This study investigates the buckling and vibrational characteristics of a porous composite cylindrical nanoshell reinforced with GPLs, considering the effects of porosity and GPLRC on natural frequency, critical axial load, and critical temperature. The material properties of piece-wise graphene-reinforced composites (GPLRC) are assumed to be graded in the thickness direction of a cylindrical nanoshell and estimated using a nanomechanical model. The results suggest that porosity, GPL distribution pattern, length scale parameter, number of layers, and GPL weight function significantly influence the natural frequency, critical load, and critical temperature of the porous GPLRC cylindrical nanoshell.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2021)
Article
Chemistry, Multidisciplinary
Oliver Iff, Quirin Buchinger, Magdalena Moczala-Dusanowska, Martin Kamp, Simon Betzold, Marcelo Davanco, Kartik Srinivasan, Sefaattin Tongay, Carlos Anton-Solanas, Sven Hoefling, Christian Schneider
Summary: A deterministic Purcell-enhanced single photon source has been demonstrated by integrating an atomically thin WSe2 layer with a circular Bragg grating cavity. This new generation of deterministic single photon sources features simple and low-cost production as well as intrinsic scalability, with the WSe2 emitters self-aligned and deterministically coupled to the broadband cavity.
Article
Chemistry, Multidisciplinary
Han Gao, Pei-Gang Chen, Tsz Wing Lo, Wei Jin, Dangyuan Lei
Summary: This study reported the chiral excitation and emission properties of single gold nanohelicoids, revealing that the geometric chirality induces the observed excitation-polarization-correlated chiral PL. Two models were developed to analyze the observed circular-polarization-steered effect, broadening the research scope of chiral PL-active materials.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Robert Collison, Juan B. Perez-Sanchez, Matthew Du, Jacob Trevino, Joel Yuen-Zhou, Stephen O'Brien, Vinod M. Menon
Summary: This study demonstrates the control of energy transfer between molecular dyes using surface lattice resonances in arrays of metal-insulator-metal nanocylinders. The results indicate that by tuning the resonance frequency and lattice dimensions, the mechanism of energy transfer can be manipulated, affecting the fluorescence behavior of the molecules.
Article
Chemistry, Multidisciplinary
Tomonori Nakamura, Shun Omagari, Xiaobin Liang, Qiwen Tan, Ken Nakajima, Martin Vacha
Summary: Using atomic force microscopy and fluorescence microscopy, we studied the single-chain structure of conjugated polymer polyfluorene (PFO). We found that mechanical stretching of the chain causes disappearance of the green emission band, indicating that the green emission originates from an intrachain aggregated state on the self-folded chain. Additionally, stretching upon laser irradiation leads to the appearance of additional features in the force spectra, small force peales in the initial stages of the unfolding, which are attributed to a combination of excitonic and van der Waals coupling of a ground-state intrachain aggregate.
Article
Multidisciplinary Sciences
Jiunn-Woei Liaw, Chiao-Wei Chien, Kun-Chi Liu, Yun-Cheng Ku, Mao-Kuen Kuo
SCIENTIFIC REPORTS
(2018)
Article
Nanoscience & Nanotechnology
Jiunn-Woei Liaw, Mao-Chang Huang, Hsueh-Yu Chao, Mao-Kuen Kuo
NANOSCALE RESEARCH LETTERS
(2018)
Article
Optics
Jiunn-Woei Liaw, Mao-Chang Huang, Cheng-Wei Huang, Yun-Cheng Ku, Mao-Kuen Kuo
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2019)
Article
Chemistry, Multidisciplinary
Jiunn-Woei Liaw, Guanting Liu, Yun-Cheng Ku, Mao-Kuen Kuo
Article
Chemistry, Multidisciplinary
Jiunn-Woei Liaw, Chia-Yu Kuo, Shiao-Wen Tsai
Summary: The study focused on the performance of quasi-spherical gold nanoparticles in generating ROS and causing cell damage when irradiated by a two-photon laser. Results showed that inhibiting ROS formation can alleviate cytoskeletal damage and cell apoptosis.
Article
Optics
Jiunn-Woei Liaw, Szu-Yao Mao, Jia-Yun Luo, Yun-Cheng Ku, Mao-Kuen Kuo
Summary: Theoretical study on the surface plasmon polaritons (SPPs) of higher-order mode propagating along a plasmonic nanowire or nanorod reveals that the propagation lengths of SPPs increase with the mode number at a specific frequency. The results show the generation of an optical vortex at the cross section of the nanowire and the helical streamlines of Poynting vector along the nanowire, indicating the presence of orbital angular momentum.
Article
Chemistry, Multidisciplinary
Shang-Yang Yu, Chang-Hsuan Tu, Jiunn-Woei Liaw, Mao-Kuen Kuo
Summary: In this work, the generation of initiated plasmonic nanobubbles and subsequent microbubbles in gold nanorod (GNR) colloidal solution induced by a pulsed laser is studied. The surface plasmon resonance (SPR)-enhanced photothermal effect of GNRs initiates nanobubbles, which then trigger the optical breakdown of water. The dynamic formations of nanobubbles and microbubbles in GNR colloids are investigated using probing He-Ne laser and ultrasonic transducer. Three types of microbubbles are identified based on optical and photoacoustic signals. The thresholds of pulsed energy to induce different types of microbubbles are reduced as the concentration of GNRs increases, especially in the near-infrared (NIR) region and close to the SPR of GNRs. This study provides insights into the relationship between plasmonic nanobubbles and triggered microbubbles.
Article
Chemistry, Multidisciplinary
Yun-Cheng Ku, Jiunn-Woei Liaw, Szu-Yao Mao, Mao-Kuen Kuo
Summary: Theoretical study on the transition of a helical surface plasmon polariton (SPP) from a circular nanohole in a thick metal film to a spiral SPP outward propagating at the film's interface shows that the propagation length of mode-1 SPP is significantly longer than other modes in a specific frequency band, depending on the nanohole size. Numerical results demonstrate that most of the energy flux fanning out at the outlet as a dipole radiation after a helical SPP tunnels through a nanohole.
Article
Mechanics
Jiunn-Woei Liaw, Bing-Xian Chen, Yun-Cheng Ku, Chun-Yi Yang, Chun-Wei Lin, Mao-Kuen Kuo
Summary: This study theoretically investigates the optomechanical manipulation of an optical vortex beam (Bessel beam) on a single gold nanoparticle. The interaction between the structured light and the gold nanoparticle results in a specific stable circular orbit on the nanoparticle's surface. The spin direction of the nanoparticle is determined by the handedness of the light.
JOURNAL OF MECHANICS
(2022)
