A5017796518- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Advanced Antenna and Metasurface Technologies
- Photonic Crystals and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Near-Field Optical Microscopy
- Semiconductor Lasers and Optical Devices
- Quantum and electron transport phenomena
- Neural Networks and Reservoir Computing
- Orbital Angular Momentum in Optics
- Antenna Design and Analysis
- Advanced Fiber Optic Sensors
- Advanced Photonic Communication Systems
- Quantum Information and Cryptography
- Optical Wireless Communication Technologies
- Advanced Fiber Laser Technologies
- Photorefractive and Nonlinear Optics
- Diamond and Carbon-based Materials Research
- Optical Coherence Tomography Applications
- Advanced Optical Sensing Technologies
- Microfluidic and Bio-sensing Technologies
- Sentiment Analysis and Opinion Mining
- Advancements in Semiconductor Devices and Circuit Design
Peng Cheng Laboratory
2022-2025
University of California, Los Angeles
2022
Institute of High Performance Computing
2007-2020
Agency for Science, Technology and Research
2016-2020
Purdue University West Lafayette
2007-2012
Pairs of gold elliptical nanoparticles form antennae, resonant in the visible. A dye, embedded a dielectric host, coats antennae; its emission excites plasmon resonances antennae and is enhanced. Far-field excitation dye-nanoantenna system shows wavelength-dependent increase fluorescence that reaches 100 times enhancement. Near-field enhanced from single nanoantenna localized subwavelength area ∼0.15μm2. The polarization along main antenna axis. These observed experimental results are...
Abstract The improvement of light‐emitting diodes (LEDs) is one the major goals optoelectronics and photonics research. LED integration to complex photonic devices requires precise control wavefront emitted light. Metasurfaces are spatial arrangements engineered scatters that may enable this light manipulation capability with unprecedented resolution. Most these devices, however, only able function properly under irradiation laser a large coherence. LEDs, on other hand, have angularly broad,...
Enhanced fluorescence is observed from dye molecules interacting with optical nanoantenna arrays. Elliptical gold dimers form individual nanoantennae tunable plasmon resonances depending upon the geometry of two particles and size gap between them. A fluorescent dye, Rhodamine 800, uniformly embedded in a dielectric host that coats nanoantennae. The act to enhance absorption. In turn, emission drives resonance antennae; signal change angular distribution emission. These effects depend...
Abstract Diffractive gratings are crucial elements for optical systems but suffer from rapid power drop at large angles. Recently, metagratings have shown their capability of deflecting light in an arbitrary direction. However, the experimental efficiency large‐angle is still low and zeroth‐order crosstalk difficult to suppress. Here a new approach high‐efficiency anomalous refraction visible spectrum demonstrated. By introducing out‐of‐plane asymmetry, it that meta‐atoms with simple...
An array of paired elliptic nanoparticles designed to enhance local fields around the particle pair is fabricated with gold embedded in quartz. Light excites a coupled plasmon resonance and system acts like plasmonic nanoantenna providing an enhanced electromagnetic field. Near-field scanning optical microscopy finite element modeling are used study field effects system. Local illumination shows similar resonant properties as plane wave illumination: strong, localized for light polarized...
Stimulated emission depletion (STED) microscopy is a versatile super-resolution imaging technique for life sciences and data storage. Despite continuous breakthroughs, modern STED microscopes are still relatively bulky limited to laboratory setups. Here, we exploit the multidimensional multiplexing properties of metalenses experimentally demonstrate realization compact lens with single metasurface. A 635-nm right-handed circularly polarized excitation laser focused by metalens into...
Abstract Efficient manipulation of nanoparticles and single molecules has always been great interest potential in nanotechnology. However, many challenges still remain effectively functionalizing structures for this purpose. In work, taking advantage graphene's Dirac plasmon its extreme confinement tunability, a monolayer conveyor along which the position optical well can be dynamically controlled is theoretically proposed. It shown that by tuning voltage, one manipulate resonance graphene...
Optical metamaterial consisting of metal-dielectric composites creates a complicated system that is not amenable to analytical solutions. This presents challenge in optimizing these intricate systems. We present the application three nature-inspired stochastic optimization techniques conjunction with fast numerical electromagnetic solvers yield satisfies required design criterion. In particular, tools (genetic algorithm, particle swarm optimization, and simulated annealing) are used for...
The much thicker intrinsic absorption layer (IAL) in normal-incidence Ge-on-Si photodetectors (NIPD) usually causes a contradiction between responsivity and bandwidth. In response to this issue, here, we simulate the design of an NIPD with geranium (Ge) layers based on “fishnet” metasurface, leading reduced device thickness as thin 380[Formula: see text]nm. optical simulation results show that light field can be perfectly localized 210[Formula: text]nm IAL, absorptivity is high 99.45% at...
All-optical thermometry plays a crucial role in precision temperature measurement across diverse fields. Quantum defects solids are one of the most promising sensors due to their excellent sensitivity, stability, and biocompatibility. Yet, it faces limitations, such as microwave heating effect complexity spectral analysis. Addressing these challenges, we introduce novel approach nanoscale optical using quantum silicon carbide (SiC), material compatible with complementary...
Inverse design focuses on identifying photonic structures to optimize the performance of devices. Conventional scalar-based inverse approaches are insufficient devices anisotropic materials such as lithium niobate (LN). To best our knowledge, this work proposes for first time method structure anisotropic-material based photonics Specifically, orientation dependent properties included in adjoint method, which provides a more precise prediction light propagation within materials. The proposed...
Metasurfaces consisting of subwavelength elements exhibit unparalleled flexibility in light manipulation terms phase, amplitude, and/or polarization at ultrathin dimensions. Typically, a continuous and complete phase distribution covering full 2π range is required metasurface design to produce the performance conventional optical components, such as gratings, lenses, beam splitters. However, an incomplete i.e., with change less or larger than 2π, can provide additional degrees freedom for...
Quantum photonic integrated circuits are reshaping quantum networks and sensing by providing compact, efficient platforms for practical applications. Despite continuous breakthroughs, integrating entangled registers into devices on a CMOS-compatible platform presents significant challenges. Herein, we present single electron-nuclear spin entanglement its integration silicon-carbide-on-insulator (SiCOI) waveguide. We demonstrate the successful generation of divacancy electron spins near-unity...
We use a nanofabricated gold grating to validate two-dimensional spatial harmonic analysis (2D SHA) method, also known as Fourier modal method or rigorous coupled-wave under oblique incidence. The transmittance spectra of the metal for incident angles 0°–30° are obtained in both experiments and simulations at zero diffraction order. performed with our custom software, fully functional web-based 2D SHA tool, which has been staged nanoHUB.org is free use. simulation results compared...
We demonstrate near field enhancement generation in silver nanoantenna-superlens systems via numerical modeling. Using near-field interference and global optimization algorithms, we can design with mismatched permittivities, whose performance match those matched permittivities. The studied here may find broad applications the fields of sensing, such as field-enhanced fluorescence surface-enhanced Raman scattering, methodology used be applied to designing other devices, two-dimensional focusing lens.
In article number 1900235 by Zhengtong Liu, Volkan Demir, Arseniy I. Kuznetsov, and co-workers, full wavefront control of LED radiation in an integrated fashion is achieved combining resonant cavities metasurfaces. This method endows sources with the advanced functionalities enabled metasurfaces, such as lensing, complex beam shaping holography, opening new venues for compact, functional light sources.
Active triangulation range finders are widely used in a variety of applications such as robotics and assistive technologies. The power the laser source should be carefully selected order to satisfy detectability still remain eye-safe. In this paper, we present systematic approach assess an active finder outdoor environment. For first time, accurately quantify background noise system due solar irradiance by coupling Perez all-weather sky model ray tracing techniques. is validated with...