Ming Kang

Tianjin Normal University, T’ien-ching-shih, Tianjin Shi, China

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Publications (22)75.39 Total impact

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    ABSTRACT: Singularity, representing a structurally stable topological defect (TD), plays a pivotal role in various physical systems. Here we theoretically present the fingerprints of TDs and uncover the resulting exotic optical properties in a tailored metasurface system. The presence of the TDs results in coherent perfect absorption, and dramatic optical property transition from slow to superluminal light behavior when the parameters cross the TD. Our investigation provides a new route to explore many phenomena of the TDs, extends the capabilities of metasurface, and offers benefits to develop potential nanophotonic applications based on the design of the metasurface.
    Optics Letters 08/2014; 39(16). · 3.39 Impact Factor
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    ABSTRACT: We theoretically propose a unidirectional dual-band circular polarizer using a subwavelength hybridized metamaterial. By fulfilling the critical requirements of left-/right-handed circular polarizer design at each band, the polarization handedness filtration can be flipped in the same structure at different operation frequency band. The physics behind this exotic performance is further explained by a simple analytical model. Our investigation expands the capabilities of metamaterials in getting intriguing optical properties. The proposed metamaterial polarizer is helpful in effective and fruitful optical polarization manipulation and is highly valuable for the development of nanophotonic devices.
    Optics Express 04/2014; 22(8):9301-9306. · 3.55 Impact Factor
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    ABSTRACT: A terahertz fishnet metamaterial, consisting of a gallium arsenide substrate sandwiched between multi-layer graphene-dielectric composites, is theoretically studied. Detailed analysis shows that this metamaterial has a left-handed transmission peak accompanied with an abnormal phase dispersion and a clear negative refractive index which originates from simultaneous magnetic and electric resonances. Our structure is unique because it has no metallic parts to achieve the left-handed properties. The most important utility of this metamaterial comes from the fact that its left-handed features can be dynamically controlled by applying external bias to shift the Fermi level in graphene.
    Applied Physics Letters 01/2014; 104(5):051902-051902-4. · 3.52 Impact Factor
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    ABSTRACT: Here, we investigate the spin-induced manipulation of orbitals using metasurfaces constructed from geometric phase elements. By carrying the spin effects to the orbital angular momentum, we show experimentally the transverse angular splitting between the two spins in the reciprocal space with metasurface, as a direct observation of the optical spin Hall effect, and an associated global orbital rotation through the effective orientations of the geometric phase elements. Such spin-orbit interaction from a metasurface with a definite topological charge can be geometrically interpreted using the recently developed high order Poincaré sphere picture. These investigations may give rise to an extra degree of freedom in manipulating optical vortex beams and orbitals using "spin-enabled" metasurfaces.
    Nano Letters 08/2013; · 13.03 Impact Factor
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    ABSTRACT: We show that polarization-independent coherent perfect absorption can be realized in a simple dipole-like metasurface by precisely engineering the ratio between the scattering loss γ<sub>s</sub> and the dissipation loss γ<sub>l</sub>. This effect can be traced to a critical condition on the scattering matrix in a dipolar picture, which requires that the scattering and dissipation losses are equivalent, i.e., γ<sub>s</sub>=γ<sub>l</sub>, at the resonant frequency f<sub>0</sub>. This work expands the capability of metasurface in getting extreme optical properties, allowing for many potential applications.
    Optics Letters 08/2013; 38(16):3086-3088. · 3.39 Impact Factor
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    ABSTRACT: Complex metamaterials with multiple optical resonances in constituent elements possess many similarities with open quantum systems that can be described by non-Hermitian Hamiltonian. By analogy with a two-state open quantum system, we show that a classic analogue of exceptional points can be observed in the transmission spectra of dual subwavelength metallic gratings. Anti-crossing (crossing) between the two branches λR of extraordinary optical transmission, with crossing (anti-crossing) of the corresponding widths ΓR, is observed in the parameter space spanned by the lateral displacement L and the angle of incidence φ<sub>0</sub>. Exchanges of field patterns and phases, and the variation of field profile when circling the exceptional point are discussed. This work highlights the potential to transfer the concepts and applications from open quantum systems to optical metamaterials.
    Optics Express 06/2013; 21(11):13368-79. · 3.55 Impact Factor
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    ABSTRACT: We propose a scheme in realizing a compact circular polarizer by using a metamaterial with a properly designed input meta-surface. This scheme is based on the selective excitation of photonic angular momentum states in a coaxial element array by the symmetry-broken input meta-surface. The topological charge m of the excited photonic angular momentum state in the coaxial element determines the handedness of the transmitted light via the orbit-spin conversion of the angular momentum of light. A net circular-polarization generation efficiency of 64.5% for a linearly polarized incidence is demonstrated.
    Applied Physics Letters 05/2013; 102(21). · 3.52 Impact Factor
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    ABSTRACT: Magneto-optical (MO) effect can break the reciprocal propagation of an optical wave along a MO-metal interface. We show that this nonreciprocal property also influences the guided modes in metal-MO-metal waveguides. Especially, the field profiles of the guided modes are neither symmetric nor anti-symmetric, but asymmetric. We then study the resonant optical transmission through a thin metal film with subwavelength MO slits. Magnetic field changes the transmission spectra of the structure, and a MO-induced transparent window is open, where the MO medium becomes extremely anisotropic. The guided-mode mediated high transmission is associated with an asymmetric field distribution and a circling energy flux.
    Optics Express 04/2013; 21(8):9563-72. · 3.55 Impact Factor
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    ABSTRACT: A photonic angular momentum state (PAMS) with a topological charge of m≠±1 is dipole forbidden at all polarizations of free-space incidence due to the existence of a unique helical phase. We show that by indirectly exciting dark PAMSs through coupling with a bright resonant element, a sharply variant transmission behavior and strong dispersion can be achieved. This behavior can subsequently be utilized in slow light. A metamaterial design, in which a group index n<sub>g</sub> greater than 500 can be achieved, is present.
    Optics Letters 02/2013; 38(3):250-2. · 3.39 Impact Factor
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    Ming Kang, Fu Liu, Jensen Li
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    ABSTRACT: We show that metamaterials can be used as a testing ground to investigate spontaneous symmetry breaking associated with non-Hermitian quantum systems. By exploring the interplay between near-field dipolar coupling and material absorption or gain, we demonstrate various spontaneous breaking processes of the $\mathcal{PT}$-symmetry for a series of effective Hamiltonians associated to the scattering matrix. By tuning the coupling parameter, coherent perfect absorption, laser action and gain-induced complete reflection ($\pi$ reflector) by using an ultra-thin metamaterial can be obtained. Moreover, an ideal $\mathcal{PT}$-symmetry can be established effectively in a passive system by exploring the balance between scattering and absorption loss using metamaterials.
    Physical Review A 10/2012; 87(5). · 3.04 Impact Factor
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    ABSTRACT: We investigate the spin-sensitive distribution of electromagnetic (EM) field from a kind of defective inhomogeneous anisotropic metamaterial, with azimuthally distributed subwavelength rectangular holes within a distribution angle of Φ<2π. This structure supports the spin-orbit interaction in the optical angular momentum, induced by the Pancharatnam-Berry phase from the manipulation of the spin states of polarization. Spin-sensitive distributions of electric field intensity, spin states of polarization, and transverse energy flow in the transmitted EM field are investigated. Importance of this investigation and the possible applications are discussed.
    Journal of Applied Physics 07/2012; 112(1). · 2.21 Impact Factor
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    ABSTRACT: We propose an ultra-thin metamaterial constructed by an ensemble of the same type of anisotropic aperture antennas with phase discontinuity for wave front manipulation across the metamaterial. A circularly polarized light is completely converted to the cross-polarized light which can either be bent or focused tightly near the diffraction limit. It depends on a precise control of the optical-axis profile of the antennas on a subwavelength scale, in which the rotation angle of the optical axis has a simple linear relationship to the phase discontinuity. Such an approach enables effective wave front engineering within a subwavelength scale.
    Optics Express 07/2012; 20(14):15882-90. · 3.55 Impact Factor
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    ABSTRACT: We show that the photonic angular momentum states (AMSs) in metamaterials can be utilized to achieve slow light. The photonic AMS possesses a helical phase, the orbital-angular-momentum degree of freedom in photons. Unlike the traditional slow-light schemes in metamaterials by using orthogonal polarizations, the photonic AMSs are dipole forbidden for all polarizations of free-space radiation due to the existence of helical phase. Numerical simulation for a metamaterial design proves the feasibility of this scheme, in which the indirectly excitation of dark photonic AMSs burns some transmission dips in the otherwise high transmission window. With the unique merits of dark photonic AMSs, this slow light scheme can realize a high group index $n_g$ greater than $\sim500$.
    06/2012;
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    ABSTRACT: We propose a metamaterial design for realizing inhomogeneous and anisotropic effective media based on the localized waveguide resonance mechanism. Such a design can be easily achieved in experiment and enables us to simultaneously manipulate the wavefront and the state of polarization of the transmitted electromagnetic field by the polarization-sensitive extraordinary optical transmission. Numerical simulations, including the generation of the hybridized vector fields (especially twisted vector fields that are azimuthally polarized carrying a helical phase), prove the feasibility of our proposal. It could be expected as a good candidate of the specially designed subwavelength element for creating the exotic vector fields beyond the functionality of the existing vector fields in a wide spectral regime, especially the terahertz and radio regimes.
    Journal of the Optical Society of America B 03/2012; 29(4):572-576. · 2.21 Impact Factor
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    ABSTRACT: We theoretically and numerically investigate the interaction of an electromagnetic wave with structured metamaterial under the excitation of linearly polarized light. A polarization map of the transmitted electromagnetic wave can reveal electromagnetic spin-to-orbital angular momentum conversion. The spatial splitting of spin states described by the Stokes parameter S3 may be viewed as the photonic version of a Stern-Gerlach experiment in the absence of a magnetic field. Our idea is ideally suitable for demonstration of electromagnetic spin-to-orbital angular momentum conversion, which offers an alternative way to comprehend the conversion. Moreover, it could enrich a variety of optical phenomena in subwavelength structured metallic systems.
    Physical Review A 03/2012; · 3.04 Impact Factor
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    ABSTRACT: The physics behind the spin (polarization)-dependent electromagnetic hot-spot phenomenon is due to the presence of the geometric phase resulting from the optical spin-orbit interaction in the interaction of light with the subwavelength microstructures. Unlike the tiny spin-dependent shift of light associated with the usual spin-Hall effect of light, here we present the distinct polarization-dependent angular shift by employing an array of subwavelength metallic apertures. More importantly, this novel electromagnetic precession is accompanied by the extraordinary optical transmission phenomenon and offers the exciting possibilities for novel applications for subwavelength structured metallic systems.
    Optics Letters 10/2011; 36(19):3942-4. · 3.39 Impact Factor
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    ABSTRACT: We predict the unidirectional optical transmission in dual-metal grating structures composed of two gratings with different structures in the absence of anisotropy and nonlinearity. The zero-order unidirectional transmission is achieved. Based on the unique property and by modulating the structural parameters, the transmittance approaches to 0% and 60% in the two opposite directions, respectively.
    Optics Letters 05/2011; 36(10):1905-7. · 3.39 Impact Factor
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    ABSTRACT: Metamaterials have shown to support the intriguing phenomenon of asymmetric electromagnetic transmission in the opposite propagation directions, for both circular and linear polarizations. In the present article, we propose a criterion on the relationship among the elements of transmission matrix, which allows asymmetrical transmission for linearly polarized electromagnetic radiation only while the reciprocal transmission for circularly one. Asymmetric hybridized metamaterials are shown to satisfy this criterion. The influence from the rotation of the sample around the radiation propagation direction is discussed. A special structure design is proposed, and its characteristics are analyzed by using numerical simulation.
    Optics Express 04/2011; 19(9):8347-56. · 3.55 Impact Factor
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    ABSTRACT: Metamaterials support optically excitable dark-plasmon modes featured by antisymmetric surface current oscillations, which can be explained by Fano-type resonance and can be tailored by controlling the embedded structural geometry. In this article, we numerically investigate the Fano-type resonance in complex metamaterials, and demonstrate the presence of Fano–Feshbach resonances due to the interaction between two Fano-type resonances in the overlapping region, implemented by breaking and tuning the symmetric properties of the resonant metallic element. Features of the resonance are discussed. This work shows that the domain of dark-plasmon mode based metamaterial system supports rich physics and can lead to various potential applications.
    Journal of Applied Physics 01/2011; 109(1):014901-014901-5. · 2.21 Impact Factor
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    ABSTRACT: We demonstrate theoretically and numerically that tunable slow light can be realized in planar semiconductor metamaterials with the unit cell composed of two different elements in a broad terahertz regime. In the unit cell, one element is a semiconductor split ring resonator and another one is a semiconductor cut wire. The interaction between the two elements of the unit cell, induced directly or indirectly by the incident electromagnetic wave, leads to a transparent window, resembling the classical analog of electromagnetically induced transparency. This transparent window, caused by the coupling of bright-bright modes or dark-bright modes, can be continuously tuned in a broad frequency regime. The strong normal phase dispersion in the vicinity of this transparent window results in the slow light effect. This scheme provides an alternative way to achieve tunable slow light in a broad frequency band and can find important applications in active and reversibly tunable slow light devices.
    Journal of Applied Physics 06/2010; · 2.21 Impact Factor

Publication Stats

75 Citations
75.39 Total Impact Points

Institutions

  • 2013–2014
    • Tianjin Normal University
      T’ien-ching-shih, Tianjin Shi, China
  • 2012
    • City University of Hong Kong
      • Department of Physics and Materials Science
      Kowloon, Hong Kong
  • 2010–2012
    • Nankai University
      • Department of Physics
      Tianjin, Tianjin Shi, China
  • 2008–2011
    • Nanjing University
      • Department of Physics
      Nanjing, Jiangsu Sheng, China