A5079740721- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Metamaterials and Metasurfaces Applications
- Optical Coatings and Gratings
- Mechanical and Optical Resonators
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Nanowire Synthesis and Applications
- Semiconductor Quantum Structures and Devices
- Advanced Semiconductor Detectors and Materials
- Advanced Optical Sensing Technologies
- Random lasers and scattering media
- Thermal Radiation and Cooling Technologies
- Advanced Antenna and Metasurface Technologies
- Quantum Dots Synthesis And Properties
- Strong Light-Matter Interactions
- Optical Network Technologies
- Perovskite Materials and Applications
- Advanced Photonic Communication Systems
- Advanced Fiber Optic Sensors
- Quantum optics and atomic interactions
- Advanced biosensing and bioanalysis techniques
- Nanofabrication and Lithography Techniques
Agency for Science, Technology and Research
2022-2024
Nanyang Technological University
2014-2024
Institute of Microelectronics
2022-2024
A*STAR Graduate Academy
2024
infrared photodetectors have been used extensively in biomedicine, surveillance, communication and astronomy. however, state of the art technology based on Ⅲ-Ⅴ Ⅱ-Ⅵ compounds still lacks excellent performance for high-temperature operation. surface plasmon polaritons (spps) demonstrated their capability improving light detection from visible to wave range due confinement subwavelength scale. advanced fabrication techniques such as electron-beam lithography (ebl) focused ion-beam (fib),...
Abstract Strong interactions between surface plasmons in ultracompact nanocavities and excitons 2D materials have attracted wide interests for its prospective realization of polariton devices at room temperature. Here, a continuous transition from weak coupling to strong molybdenum disulfide (MoS 2 ) monolayer highly localized nanoantenna is proposed. The assembled by silver nanocube positioned over gold film separated dielectric spacer layer. A 1570‐fold enhancement the photoluminescence...
All inorganic cesium lead halide perovskite semiconductors exhibit great potential for nanolasers, light-emitting diodes, and solar cells, because of their unique properties including low threshold, high quantum efficiency cost. However, the material refractive index hinders light extraction photonic illumination applications. In this paper, we demonstrate achieved in CsPbBr2.75I0.25 two-dimensional crystals. The crystals both emission rate inhibition energy redistribution simultaneously. We...
Strong light–matter interaction in 2D materials at the few-exciton level is important for both fundamental studies and quantum optical applications. Characterized by a fast coherent energy exchange between photons excitons, strongly coupled plasmon–exciton systems have been reported with large Rabi splitting. However, splitting generally requires fields highly confined mode volume, which are difficult to achieve in-plane excitons materials. In this work, we present study of gold dimer...
This paper presents theoretical studies on the ring-bus-ring (RBR) resonator system, which consist of two resonators indirectly coupled through a center waveguide between them. By controlling intercavity interaction and engineering phase response incorporation RBR with Mach-Zehnder interferometer, we show that it is possible to generate spectrum resembling electromagnetically induced transparency (EIT), qualitatively different compared other existing EIT schemes. The becomes sharper as...
Abstract Metamaterials provide a good platform for biochemical sensing due to its strong field localization at nanoscale. In this work, we show that electric and magnetic resonant modes in split-ring-resonator (SRR) can be efficiently excited under unpolarized light illumination when the SRRs are arranged fourfold rotationally symmetric lattice configuration. The fabrication characterization of deep subwavelength (~λ/15) gold-based SRR structures with resonator size as small ~ 60 nm reported...
Abstract Strong plasmon–exciton interactions in monolayer transition‐metal dichalcogenides (TMDs) is emerging as a promising material platform for light emissions, nonlinear optics, and quantum communications, their realizations require highly localized electric fields parallel to the transition dipole moment of TMD excitons. Here, systematic study light–matter interaction planar dimer nanoantenna nanoscale gaps coupled with WS 2 presented, where effects local field enhancement spatial mode...
We show the increase of photoluminescence intensity ratio (PLR) and emission rate enhancement perovskite cesium lead bromide (CsPbBr3) formamidinium (FAPbBr3) nanocrystals (NCs) in presence single double gold layer cavities, which we refer to as Metal-Emitter (ME) Metal-Emitter-Metal (MEM) nanostructures. Up 1.9-fold PLRs up 5.4-fold enhancements were obtained for FAPbBr3 NCs confined by layers, are attributed plasmonic confinement from layers. The experimentally values validated analytical...
Abstract Introducing super‐resolution techniques to imaging through scattering media potentially revolutionizes the technical analysis for many exotic applications, such as cell structures behind biological tissues. The main challenge is media's inhomogeneous structures, which scramble light path and create noise‐like speckle patterns, hindering object's visualization even at a low‐resolution level. Here, computational method proposed relying on spatial temporal fluctuation visualize...
Ultrahigh density nanostructure arrays with controlled size and position have promised a variety of potential applications. However, their practical realization is often hindered by the amount resources required for large-scale fabrication. Using an ultrahigh contrast electron beam lithography process, we show resolution high aspect ratio patterning capability which can be done at exposure dose lower than 100 μC cm−2. In particular, dot on 110 nm thick resist confirmed standard lift-off...
Split ring resonator (SRR) metamaterials working in the visible spectrum have great potential applications, but their fabrication is challenging due to stringent requirements feature size and critical dimension. This paper reports systematic characterization of silver SRRs with sub‐100‐nm sizes that can magnetic resonance entering into frequency spectrum. SRR as small ∼60 nm fundamental ( LC ‐resonance) short ∼604 been successfully demonstrated, which best our knowledge represent smallest...
The achievable fundamental magnetic resonance in split ring resonators (SRR) is limited by the electron plasma oscillation metal. This so-called kinetic inductance limitation was predicted many years ago, but its experimental verification has been hindered due to nanofabrication challenges. Here, first demonstration of frequency saturation reported at 520 THz ultrasmall v-shape gold SRRs. As a service our authors and readers, this journal provides supporting information supplied authors....
Optics-based sensing platform working under unpolarized light illumination is of practical importance in the applications. For this reason, platforms based on localized surface plasmons are preferred to their integrated optics counterparts for simple mode excitation and inexpensive implementation. However, optical response typically weak due strong polarization dependence. Herein, role rotational symmetry realizing robust exhibiting contrast high sensitivity explored. Specifically, gammadion...
Middle wavelength infrared (MWIR) photodetectors have a wide range of applications, but almost all them operate at low temperature due to the limit materials and device structures. The capability plasmonic structures localize electromagnetic wave on deep subwavelength scale provides possibility for MWIR operating room temperature. Here, we report high sensitivity photodetector which is an InAs0.91Sb0.09-based heterojunction n-i-p photodiode integrated with Au-based two-dimensional hole array...
Capping layers are essential for protecting phase change materials (PCMs) used in nonvolatile photonics technologies. This work demonstrates how (ZnS)0.8-(SiO2)0.2 caps radically influence the performance of Sb2S3 and Ag-doped integrated photonic devices. We found that at least 30 nm capping material is necessary to protect from sulfur loss. However, adding this cap affects crystallization temperatures two PCMs different ways. The temperature increased decreased, respectively, which...
Aluminum nitride (AlN) is a promising photonics material contributed by its wide transparency window and remarkable nonlinear optical property. Moreover, effect can be further enhanced doping Scandium (Sc). Such property brings potential for high efficiency in generation processes, such as 2nd harmonic frequency comb generation. Although the of Sc-doped AlN looks promising, waveguide facing challenge on loss reduction. In this work, we report photonic integrated circuit with reduced 6 dB/cm...
We experimentally demonstrate coupled-resonator-induced-transparency (CRIT) phenomenon in ring-bus-ring (RBR) geometry synergistically integrated with Mach-Zehnder interferometer (MZI). The RBR consists of two detuned resonators indirectly coupled through a center bus waveguide. transparency is obtained by increasing the light intercavity interaction tailoring phase response while ensuring balanced MZI operation. In this work, CRIT resonance quality factor ~18,000 demonstrated cavity size...
Since optical gain was observed from colloidal quantum dots (CQDs), research on CQD lasing has been focused the CQDs themselves as materials and their coupling with resonators. Combining advantages of a medium microcavity in laser device is desirable. Here, we show concentric circular Bragg gratings intimately incorporating CdSe/CdZnS/ZnS gradient shell CQDs. Because strong circularly symmetric confinement two dimensions, output beam CQD-based grating distributed feedback found to be highly...
We demonstrate experimentally the finesse enhancement in a pair of mutually coupled ring resonators to two buses fabricated silicon-on-insulator technology, as proposed theoretically an earlier paper. A close 100 (or Q=30000) is obtained two-ring system, with outer double size inner ring, and external coupling coefficient 34%. The maximum relative single-ring structure 14 times, good agreement theoretical prediction.