A5068959167- Photonic and Optical Devices
- Perovskite Materials and Applications
- Plasmonic and Surface Plasmon Research
- 2D Materials and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Chalcogenide Semiconductor Thin Films
- Luminescence Properties of Advanced Materials
- Nonlinear Optical Materials Studies
- Graphene research and applications
- Photonic Crystals and Applications
- Advanced Fiber Laser Technologies
- Copper-based nanomaterials and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanowire Synthesis and Applications
- Silicon Nanostructures and Photoluminescence
- Metamaterials and Metasurfaces Applications
- Random lasers and scattering media
- Mineralogy and Gemology Studies
- Advanced Fluorescence Microscopy Techniques
- Near-Field Optical Microscopy
- Nanoplatforms for cancer theranostics
- Chromium effects and bioremediation
- Electrostatics and Colloid Interactions
- Microbial Fuel Cells and Bioremediation
- MXene and MAX Phase Materials
Academia Sinica
2022-2024
Institute of Physics, Academia Sinica
2018-2023
National Taiwan University
2012-2023
National Taiwan Normal University
2018
Tamkang University
2018
Ming Chi University of Technology
2018
Silicon photonics have attracted significant interest because of their potential in integrated components and all-dielectric meta-optics elements. One major challenge is to achieve active control via strong photon-photon interactions, i.e. optical nonlinearity, which intrinsically weak silicon. To boost the nonlinear response, practical applications rely on resonant structures such as microring resonators or photonic crystals. Nevertheless, typical footprints are larger than 10 μm. Here, we...
Abstract High‐index nanostructures are found to exhibit large nonlinearity of spectral responses under photoexcitation, which is applicable all‐optical modulation. The stems from Mie‐type resonance shift due photoinduced variation refractive index. Here, amorphous silicon‐based Huygens’ metasurface absorber and ultrafast excitation used demonstrate two orders magnitude enhancement modulation depth, both theoretically experimentally, when electric dipole lattice matches the magnetic...
Multifunctional lanthanide-doped upconversion nanoparticles (UCNPs) have spread their wings in the fields of flexible optoelectronics and biomedical applications. One ongoing challenges lies achieving UCNP-based nanocomposites, which enable a continuous-wave (CW) laser action at ultralow thresholds. Here, gold sandwich UCNP nanocomposites [gold (Au1)–UCNP–gold (Au2)] capable exhibiting lasing thresholds under CW excitation are demonstrated. The metastable energy-level characteristics...
Indium selenide (InSe) is an emerging van der Waals material, which exhibits the potential to serve in excellent electronic and optoelectronic devices. One of advantages layered materials their application flexible How strain alters optical properties is, thus, important issue. In this work, we experimentally measured dependence on angle-resolved second harmonic generation (SHG) pattern a few layers InSe. We used exfoliation method fabricate InSe flakes SHG images with different azimuthal...
Tuning the optical and electrical properties by stacking different layers of two-dimensional (2D) materials enables us to create unusual physical phenomena. Here, we demonstrate an alternative approach enhance charge separation alter in van der Waals heterojunctions with type-II band alignment using thin dielectric spacers. To illustrate our working principle, implement a hexagonal boron nitride (h-BN) sieve layer between InSe/GeS heterojunction. The transitions at junctions studied...
Two-dimensional ternary materials are attracting widespread interest because of the additional degree freedom available to tailor material property for a specific application. An In1–xSnxSe phototransistor possessing tunable ultrahigh mobility by Sn-doping engineering is demonstrated in this study. A striking feature flakes reduction oxide phase compared undoped InSe, which validated spectroscopic analyses. Moreover, first-principles density functional calculations performed crystal system...
Abstract Two-dimensional group-IV monochalcogenides such as GeS, GeSe, SnS, and SnSe were theoretically predicted multiferroic materials with two or more ferroic properties. However, most of their bulk crystals are stacked layer by an antiferroelectric manner, which lose the macroscopic in-plane ferroelectricity. In this work, we studied SnS in layers a ferroelectric manner both experimentally theoretically. We utilized polarization-resolved second harmonic generation (SHG) microscopy to...
Polycrystalline diamond films were demonstrated as good candidates for electron field emitters, and their mechanical/thermal properties should thus be considered real devices. We utilized ultrafast optical techniques to investigate the phonon dynamics of several polycrystalline films, prepared by microwave plasma enhanced chemical vapor deposition. The mechanical (longitudinal acoustic velocity) thermal conductivities evaluated from coherent incoherent dynamics, respectively....
Abstract Nonlinear silicon nano‐photonics has recently attracted significant attention due to the plethora of electric and magnetic Mie resonances that offer substantial enhancement optical nonlinearities. Conventionally, characterization nonlinearity its transient nature rely on intensity‐scan methods (z‐scan) in spatial domain pump‐probe techniques temporal domain. However, most studied ultrafast nonlinear effects are instantaneous, is, strongest at zero delay, have a solitary power...
Abstract By using localization techniques, we demonstrated that the morphology of a 2D material in three dimensions can be optically obtained with nanometer precision z -axis. This technique provides convenient method to study correlation between optical properties and materials for same area. We utilized microscopy directly ultrafast photoluminescence graphene. observed enhancement from deformed In comparison planar graphene, factor could up several times at highly curved region. found...
Confocal pump-probe backscattering was used to study phonon dynamics of single nanoparticles, which can extend confocal microscopy for investigating carrier nanomaterials. Compared previous studies, in nonlinear optical generation widely utilized, spectral filters were employed this work separate the spectra from pulses pump/probe beams. This not only reduces complexity experimental setup but also circumvent aberration issue. Phonon dynamics, including acoustic vibrations and heat diffusion,...
The ultrafast variation of optical bandgap, due to the presence photocarriers, was investigated in exfoliated InSe. thickness and surface condition play an important role carrier lifetime.
The recent evolution of semiconductor nanodevices, including nanoresonators and metasurfaces, has provided active tunability optical functionality by efficiently utilizing various mechanisms such as mechanical deformation, carrier concentration modulation, a tunable liquid crystal medium. Among these ideas, thermally induced nonlinear light–matter interaction holds great potential to realize all-optical control signal intensity with exceptionally large modulation depth. Here, we review...
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Mie-type optical resonators are applicable to all-optical modulation. In article number 2300102, Hao-Yu Cheng, Kung-Hsuan Lin, Kuo-Ping Chen, and co-workers demonstrate both theoretically experimentally that modulation depth is enhanced by two orders of magnitude in Huygens' metasurface absorber where electric dipole lattice resonance matches the magnetic resonance. Within picosecond scale delay after ultrafast photoexcitation a few square micrometer spatial confinement, over 100%...
Silicon photonics has attracted significant interest in recent years due to its potential integrated components (1,2) as well all-dielectric meta-optics elements.(3) Strong photon-photon interactions, aka optical nonlinearity, realizes active control of aforementioned photonic devices.(4,5) However, intrinsic nonlinearity Si is too weak envision practical applications. To boost the nonlinear response, long interaction-length structures such waveguides, or resonant microring resonators...
In article number 2101711, Kung-Hsuan Lin, Shi-Wei Chu, and co-workers demonstrate a temporally tunable transient nonlinearity based on fluence-dependent carrier dynamics. This is exemplified via Auger recombination silicon nanostructures. By combining spatial confocal x-scan temporal pump–probe techniques, the fluence dependence analyzed at different delays various nonlinearities are found, including sub-linear, super-linear, surprisingly full saturation behaviors. [Cover image: artwork by...
An amendment to this paper has been published and can be accessed via a link at the top of paper.
In this study, we propose the concept of generating transient nonlinearity via nonlinear carrier lifetime variation based on Auger recombination in silicon nanostructures. The creates a common crossing point for all pump-probe traces at different pump fluences, presenting fluence-independent property. Furthermore, observe that sub-linear and super-linear responses exist before after point, revealing an unconventional temporal tunability Auger-induced nonlinearity. Leveraging combination...