A5091773444- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic and Optical Devices
- Nonlinear Optical Materials Studies
- Advanced Antenna and Metasurface Technologies
- Optical Coatings and Gratings
- Phase-change materials and chalcogenides
- Orbital Angular Momentum in Optics
- Photonic Crystals and Applications
- Copper-based nanomaterials and applications
- Advanced Photocatalysis Techniques
- Advanced Fiber Laser Technologies
- Chalcogenide Semiconductor Thin Films
- Terahertz technology and applications
- Advanced biosensing and bioanalysis techniques
- Laser-Matter Interactions and Applications
- Thermal Radiation and Cooling Technologies
- ZnO doping and properties
- Quantum optics and atomic interactions
- Spectroscopy and Quantum Chemical Studies
- Optical Wireless Communication Technologies
- Near-Field Optical Microscopy
- Optical Network Technologies
- Advanced Fluorescence Microscopy Techniques
National Yang Ming Chiao Tung University
2022-2025
National Taiwan University
2012-2023
Research Center for Applied Science, Academia Sinica
2014-2022
École Polytechnique Fédérale de Lausanne
2020-2022
Academia Sinica
1956-2020
Rice University
2017
National Cheng Kung University
2014
University of Southampton
2014
Nanyang Technological University
2014
National Applied Research Laboratories
2012
Abstract We propose all‐dielectric metasurfaces that can be actively re‐configured using the phase‐change material Ge 2 Sb Te 5 (GST) alloy. With selectively controlled phase transitions on composing GST elements, tailored to exhibit varied functionalities. Using rod as basic building block, we have modelled metamolecules with tunable optical response when change occurs select constituent rods. Tunable gradient realized variable supercell period consisting of different patterns rods in their...
Artificial photosynthesis using semiconductors has been investigated for more than three decades the purpose of transferring solar energy into chemical fuels. Numerous studies have revealed that introduction plasmonic materials photochemical reaction can substantially enhance photo response to splitting water. Until recently, few systematic provided clear evidence concerning how plasmon excitation and which factor dominates water in photovoltaic devices. This work demonstrates effects...
Color pixels composed of plasmonic nanostructures provide a highly promising approach for new display technologies, capable vivid, robust coloration and incorporating the use low-cost materials, such as aluminum. Here we report device that can be tuned continuously across entire visible spectrum, based on integrating square array aluminum into an elastomeric substrate. By stretching substrate in either its two dimensions, period therefore scattering color modified to blue or red at-rest...
Dielectric metasurfaces have emerged as a powerful platform for novel optical biosensors. Due to their low loss and strong light–matter interaction, they demonstrate several exotic properties, including sharp resonances, near-field enhancements, the compelling capability support magnetic modes. They also show advantages such CMOS-compatible fabrication processes lower resonance-induced heating compared plasmonic counterparts. These unique characteristics are enabling advancement of...
Surface-enhanced infrared absorption (SEIRA) spectroscopy has outstanding potential in chemical detection as a complement to surface-enhanced Raman (SERS), yet it historically lagged well behind SERS sensitivity. Here we report new ultrasensitive antenna designed bring SEIRA into the few-molecule range. Our consists of bowtie-shaped Au structure with sub-3 nm gap, positioned create cavity above reflective substrate. This three-dimensional geometry tightly confines incident mid-infrared...
Abstract Metasurfaces, the 2D counterpart of artificial metamaterials, have attracted much attention because their exceptional ability to manipulate electromagnetic wave such as amplitude, phase, polarization, propagation direction, and so on. Different from conventional lenses, metalenses based on metasurface optics are truly flat compact exhibit superior performance. In this report, recent progress in development is explored. First, working principle characteristics discussed. Then, it...
Vacuum ultraviolet (VUV) light plays an essential role across science and technology, from molecular spectroscopy to nanolithography biomedical procedures. Realizing nanoscale devices for VUV generation control is critical next-generation sources systems, but the scarcity of low-loss materials creates a substantial challenge. We demonstrate metalens that both generates—by second-harmonic generation—and simultaneously focuses generated light. The consists 150-nm-thick zinc oxide (ZnO)...
Surface-enhanced infrared absorption spectroscopy (SEIRA) has emerged as a powerful technique for ultrasensitive chemical-specific analysis. SEIRA can be realized by employing metasurfaces that enhance light-matter interactions in the spectral bands of molecular vibrations. Increasing sample complexity emphasizes need operate simultaneously at different bands, both accessing rich information over broad band, and resolving subtle differences fingerprints through narrow-band resonances. Here,...
Abstract High‐performance deep ultraviolet (DUV) spectroscopy is crucial in driving innovations for biomedical research, clinical diagnosis, and material science. DUV resonant nanostructures have shown capabilities significantly improving sensitivity. However, they encounter significant challenges practical applications, including instability due to oxidation light‐induced damage, the strong photoluminescent noise background from their constituent materials. An efficient robust platform...
Deep-ultraviolet (DUV) light is essential for applications including fabrication, molecular research, and biomedical imaging. Compact metalenses have the potential to drive further innovation in these fields, provided they utilize a material platform that cost-effective, durable, scalable. In this work, we present aluminum nitride (AlN) as an efficient solution DUV applications. These metalenses, with thickness of only 380 nm, deliver focusing imaging capabilities close theoretical...
We report on the demonstration of a femtosecond all-optical modulator providing, without nonlinearity and therefore at arbitrarily low intensity, ultrafast light-by-light control. The device engages coherent interaction optical waves metamaterial nanostructure only 30 nm thick to efficiently control absorption near-infrared (750-1040 nm) pulses, providing switching contrast ratios approaching 3:1 with modulation bandwidth in excess 2 THz. functional paradigm illustrated here opens path...
Vacuum ultraviolet (VUV) light has important applications in many fields, ranging from device fabrication to photochemistry, environmental remediation microscopy and spectroscopy. Methods produce coherent VUV frequently utilize high harmonic generation media such as rare gases or atomic vapors; nonlinear optical crystals that support second into the are quite rare. Here, we demonstrate an all-dielectric metasurface designed for of light. Consisting array zinc oxide nanoresonators, exhibits a...
Dielectric metasurfaces have recently been shown to provide an excellent platform for the harmonic generation of light due their low optical absorption and strong electromagnetic field enhancement that can be designed into constituent meta-atoms. Here, we demonstrate vacuum ultraviolet (VUV) third from a specially dielectric metasurface consisting titanium dioxide (TiO2) nanostructure array. The was enhance VUV at wavelength 185 nm by tailoring its geometric design parameters achieve...
Manipulation and precise delivery of optical energies in the regions interest within specimens require different strategies. Hence, proper control input beam parameters is a prerequisite. One prominent methods metasurface optics, capable crafting properties light at nanoscales. Here, generation an abrupt autofocusing (AAF) by nanophotonic for biomedical applications demonstrated. Fluorescence guided laser microprofiling mouse cardiac samples experimentally investigated, using AAF to deliver...
Amorphous thin films of Ge(2)Sb(2)Te(5), sputter-deposited on a ZnS-SiO(2) dielectric layer, are investigated for the purpose understanding structural phase-transitions that occur under influence tightly-focused laser beams. Selective chemical etching recorded marks in conjunction with optical, atomic force, and electron microscopy as well local diffraction analysis used to discern complex features created broad range powers pulse durations. Clarifying nature phase transitions associated...
Abstract A new fabrication strategy in which Ag plasmonics are embedded the interface between ZnO nanorods and a conducting substrate is experimentally demonstrated using femtosecond‐laser (fs‐laser)‐induced plasmonic ZnO/Ag photoelectrodes. This fs‐laser technique can be applied to generate patternable nanostructures for improving their effectiveness hydrogen generation. Plasmonic nanostructure photoelectrodes show an increase photocurrent of nanorod by higher than 85% at 0.5 V. Both...
Abstract Metasurfaces comprising 3D chiral structures have shown great potential in chiroptical applications such as optical components and sensing. So far, the main challenges lie nanofabrication limited operational bandwidth. Homogeneous localized broadband near‐field chirality enhancement has not been achieved. Here, an effective method to create a metasurface with far‐ properties is demonstrated. A focused ion beam used cut stretch nanowires into Archimedean spirals from stacked films....
Abstract Light-sheet fluorescent microscopy has become the leading technique for in vivo imaging fields of disease, medicine, and cell biology research. However, designing proper illumination high image resolution optical sectioning is challenging. Another issue geometric constraints arising from multiple bulky components detection. Here, we demonstrate that those issues can be well addressed by integrating nanophotonic meta-lens as component LSFM. The composed 800-nm-thick GaN...
Chirality (C) is a fundamental property of objects, in terms symmetry. It extremely important to sense and distinguish chiral molecules the fields biochemistry, science, medicine. Vibrational circular dichroism (VCD) spectroscopy, obtained from differential absorption left- right- circularly polarized light (CPL) infrared range, promising technique for enantiomeric detection separation. However, VCD signals are typically very weak most small molecules. Dielectric metasurfaces an emerging...
Using a femtosecond laser, we have transformed the laser-direct-writing technique into highly efficient method that can process AgO(x) thin films Ag nanostructures at fast scanning rate of 2000 μm(2)/min. The processed exhibit broad-band enhancement optical absorption and effectively function as active SERS substrates. Probing plasmonic hotspots with dyed polymer beads indicates these are uniformly distributed over treated area.
We investigate the plasmonic resonance modes and coupling effects of single silver nanobeads nanobead dimers. Numerical investigation using three-dimensional finite element method indicates that exhibit two resonances corresponding to bonding anti-bonding modes, respectively. The boundary symmetry on inner outer surfaces can be broken by increasing refractive indices cores filling dielectric holes. It is shown only mode found for low-refractive index cores, whereas both high-refractive cores.
Abstract A novel method based on femtosecond laser‐induced forward transfer for high‐throughput and efficient fabrication of periodic multilayer plasmonic metamaterials is demonstrated. With precisely controlling laser raster path applied sputtered thin films, the laser‐ablated materials can be transferred to another substrate leaving fabricated structure original substrate. Subsequently, three‐dimensional made by structuring. Moreover, all experimental results show that create such split...
Femtosecond laser pulses are focused on a thin film of Ge2Sb2Te5 phase-change material, and the transfer illuminated material to nearby substrate is investigated. The size, shape, phase-state fabricated pattern can be effectively controlled by fluence thickness film. Results show multi-level electrical optical reflection states patterns, which may provide simple efficient foundation for patterning future devices.
Thin films are central to modern technologies ranging from semiconductors metamaterials. The authors observe that by placing a subwavelength thin film at the node of an electromagnetic standing wave, it is possible separate electric magnetic dipole terms, or quadrupole in absorption spectrum. technique twice as sensitive conventional measurements, functions very low laser power, and reveals resonances invisible existing spectroscopies. This approach could see application analytical...
Abstract An ultrathin planar cavity metasurface is proposed based on film interference and its practicability for light manipulation in visible region experimentally demonstrated. Phase of reflected modulated by finely adjusting the thickness amorphous silicon (a‐Si) a few nanometers an aluminum (Al) substrate via nontrivial phase shifts at interfaces multireflections generated from cavity. A shift π, basic requirement two‐level systems, can be accomplished with 8 nm thick difference. For...