Publications (10)21.5 Total impact
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Article: Submicrometer radius and highly confined plasmonic ring resonator filters based on hybrid metal-oxide-semiconductor waveguide.
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ABSTRACT: We numerically report the submicrometer radius (0.5 μm) and high confinement (mode area ∼λ<sup>2</sup>/1200) plasmonic ring resonators for both all-pass and add-drop filters based on the hybrid metal-oxide-semiconductor (Ag-SiO<sub>2</sub>-Si) waveguide platform. The best tradeoff between the propagation length and the confinement of this hybrid plasmonic waveguide platform is also discussed and compared to the dielectric-loaded plasmonic waveguide counterpart. We show that the ring resonator all-pass filter features an extinction ratio as high as 23 dB with a transmission loss of 1.5 dB, and a wide free spectral range of 168 nm with a bandwidth of 14 nm. Moreover, the demonstrated add-drop filter achieves an extinction ratio larger than 12 dB with a channel isolation between the through and drop channels of 13.5 dB at the resonant wavelength. These demonstrated plasmonic devices reveal as potential building blocks for future nanoscale electronic-photonic integrated circuits.Optics Letters 11/2012; 37(21):4564-6. · 3.40 Impact Factor -
Article: Hybrid Dielectric-Loaded Plasmonic Waveguide-Based Power Splitter and Ring Resonator: Compact Size and High Optical Performance for Nanophotonic Circuits
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ABSTRACT: The key challenge of the plasmonic waveguide is to achieve simultaneously both the long propagation length and high confinement. The hybrid dielectric-loaded plasmonic waveguide consists of a SiO2 stripe sandwiched between a Si-nanowire and a silver film and thus promises as a best candidate to overcome this challenge. We propose to exploit this unique property of this structure to design different high-efficient silicon-based plasmonic components including waveguide, power splitter, and wavelength-selective ring resonator. As a result, the proposed power splitter with a waveguide cross section (λ 2/60) and a strong mode confinement area (~λ 2/240) features a low power transmission loss (<0.4dB) at the optimal arm length of 4μm with respect to different separation distances of output arms. Moreover, we also demonstrate that a plasmonic ring resonator with a compact ring radius of 2μm may achieve high optical performance such as high-extinction ratio of 30dB, large free spectral range of 67nm, and small bandwidth of 0.6nm. These superior performances make them promising building blocks for integrated nanophotonic circuits. KeywordsSurface plasmons–Waveguide–Power splitter–Ring resonatorPlasmonics 05/2012; 6(3):591-597. · 2.99 Impact Factor -
Article: Design of a monopole-antenna-based resonant nanocavity for detection of optical power from hybrid plasmonic waveguides.
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ABSTRACT: A novel plasmonic waveguide-coupled nanocavity with a monopole antenna is proposed to localize the optical power from a hybrid plasmonic waveguide and subsequently convert it into electrical current. The nanocavity is designed as a Fabry-Pérot waveguide resonator, while the monopole antenna is made of a metallic nanorod directly mounted onto the metallic part of the waveguide terminal which acts as the conducting ground. The nanocavity coincides with the antenna feed sandwiched in between the antenna and the ground. Maximum power from the waveguide can be coupled into, and absorbed in the nanocavity by means of the field resonance in the antenna as well as in the nanocavity. Simulation results show that 42% optical power from the waveguide can be absorbed in a germanium filled nanocavity with a nanoscale volume of 220 × 150 × 60 nm3. The design may find applications in nanoscale photo-detection, subwavelength light focusing and manipulating, as well as sensing.Optics Express 08/2011; 19(18):17075-85. · 3.59 Impact Factor -
Conference Proceeding: Characterization of planar hybrid dielectric-loaded plasmonic nano-waveguides used for nano-photonic circuits
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ABSTRACT: Key challenge in the design of plasmonic nano-waveguide is to simultaneously achieve high confinement and low propagation loss. This paper presents that a planar hybrid dielectric-loaded plasmonic nano-waveguide (HDLW) could be a promising candidate to build high-performance plasmonic components. Our studies show that the HDLW can achieve better trade-off between the field intensity confinement and the propagation length than a metal-insulator-metal nanoslot waveguide does. Consequently, a 90°-circular bend built with the HDLW can achieve a total loss of 0.3 dB with a small bending radius of 2μm. A ring resonator formed with the HDLW shows the excellent performance: with a ring radius of 5 μm, this resonator exhibits a large free spectral range (22 nm), a narrow bandwidth (4 nm), and high extinction ration (20 dB). The superior performance of these plasmonic components makes them promising building blocks for nanophotonic integrated circuits.Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International; 07/2011 -
Article: Optical performance of single-mode hybrid dielectric-loaded plasmonic waveguide-based components
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ABSTRACT: The single mode hybrid dielectric-loaded plasmonic waveguide is presented at the wavelength of 1.55 μm. We show that this waveguiding structure, consisting of a low-index SiO2-stripe sandwiched between a high-index Si-nanowire and a silver film, achieves both long propagation length and strong field confinement with high power intensity. Components such as 90°-circular and S-shaped bends, based on the proposed waveguide with an intensity confinement area of 50×200 nm2, can obtain a total transmission efficiency exceeding 85% for various bend radii. Finally, we demonstrate that the efficient directional couplers can be developed using two coupled waveguides. In particular, we determine the typical coupling lengths and maximum transfer power for different structural parameters of the coupler. These investigations provide the foundations for the design of chip-scale integrated plasmonic circuitry.Applied Physics Letters 06/2010; 96(22):221103-221103-3. · 3.84 Impact Factor -
Article: Enhancing the Reception of Propagating Surface Plasmons Using a Nanoantenna
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ABSTRACT: We present a technique to efficiently receive electromagnetic fields from a metal-insulator-metal waveguide using a dipole nanoantenna formed by two nanorods. The received fields are strongly enhanced in a nanocavity, also created by the two nanorods, via localized surface plasmon effects. The averaged or volume-integration of the electric field intensity in the nanocavity can be maximized by optimizing the geometry of the nanorods, the gap distance between the two nanorods, as well as the optical properties of the materials inside the nanocavity. The proposed technique may find applications in the design of plasmonic photodetectors, switches, and sensors.IEEE Photonics Technology Letters 03/2010; · 2.19 Impact Factor -
Article: Electrical detection of plasmonic waves using an ultra-compact structure via a nanocavity.
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ABSTRACT: A novel structure is proposed to electrically detect the plasmonic waves from a subwavelength plasmonic waveguide. By locating two L-shaped metallic nanorods in close proximity of each other at the end of the plasmonic waveguide, a metal-semiconductor-metal plasmonic detector is constructed. The L-shaped nanorods also form a dipole nanoantenna and a nanocavity to focus the photonic power into the active volume of the detector. The dimensions and locations of the L-shaped nanorods are studied to maximize the transmission efficiency of the photonic power from the plasmonic waveguide to the detector. Impedance matching with a sub is investigated to further improve the power transmission. Possible leads of the detector are discussed and their effects are investigated. Proposed detector has an ultra-compact and easy-to-fabricate planar structure, and a potentially THz speed, high responsivity as well as low power dissipation.Optics Express 12/2009; 17(26):24349-57. · 3.59 Impact Factor -
Conference Proceeding: Non-Equilibrium Green's Function Calculation of Optical Absorption in Nano Optoelectronic Devices
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ABSTRACT: The high speed of optical devices motivates the integration between electronics and photonics. One of the most common optoelectronic devices used for such integration is a photodetector. This paper describes the formulation of an optical absorption inside a photodetector using the non-equilibrium Green's function (NEGF) framework. To illustrate the use of the formulation, optical properties of a double barrier quantum well photodetector are simulated. The photocurrent and the spectral response of the photodetector are calculated and presented. We also study the effect of varying various bias voltage and introducing non-uniformity in the effective mass. It is found that the peak locations do not change significantly under these variations.Computational Electronics, 2009. IWCE '09. 13th International Workshop on; 06/2009 -
Conference Proceeding: Applications of meshfree methods in electromagnetics
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ABSTRACT: Two potential applications of meshfree methods are proposed.Computation in Electromagnetics, 2008. CEM 2008. 2008 IET 7th International Conference on; 05/2008 -
Article: Effects of metal–molecule interface conformations on the electron transport of single molecule
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ABSTRACT: The electron transport effects of molecule locations on the metal interface are investigated through metal–molecule–metal systems using the first principles method, based on density functional theory with norm conserving non-local pseudopotentials and non-equilibrium Green’s functions. Three kinds of molecule–metal interface conformations are studied. These include locating the molecule on the top, at the hollow site and on the bridge of metal surface atoms. Au–molecule–Au open systems are constructed and numerically examined where Au electrodes are described through a 3-D atomic model. The current–voltage characteristics, density of states and transmission functions of constructed systems are calculated and analyzed. Simulated results show that the on-atom contact exhibits the best molecule–metal coupling when an external bias lower than 1.4 V is applied. The bridge contact has a similar coupling as the hollow contact with a small difference at larger external bias. This may partially explain why experimental results have poor repeatability.Current Applied Physics 6(3):531-535. · 1.90 Impact Factor
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Institutions
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2009–2010
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Institute Of High Performance Computing
Singapore, Singapore
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