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Photonic crystal (PhC) nanobeam cavities have attracted increasing attention owing to the advantages of high Q-factor, small mode volume and no limitation of FSR. Various PhC cavities have been developed for optical communications, optical sensors, optomechanics, etc.. We investigate the design, fabrication, and experimental characterization of high quality factor PhCnanobeam cavities on silicon....
It is know that photonic crystals with Dirac-like conical dispersions at k = 0 derived from monopole and dipole excitations can serve as a “classical system” with zero-refractiveindex [1]. We will show that such a system also behaves as if it is a “quantum-like system” with pseudo-spin 1 [2]. In some dielectric photonic crystals exhibiting conical dispersions at k = 0, the eigenmodes can be described...
When human society entered the 21st century, the demand of high-speed and large-capacity optical communication systems is constantly increasing and at the same time photonic crystal fabrication techniques have also made great progress. Precisely because of this, optical devices for information and communication systems, which are designed by the concept of photonic crystal, have been studied attractively...
Photonic crystal (PhC) structures are good platform for solid-state quantum photonics. Efficient generation and guiding of single photons from semiconductor quantum dots (QDs) embedded in two dimensional (2D) PhC waveguides have been demonstrated recently. Various cavity quantum electrodynamics (CQED) phenomena have also been intensively explored in 2D PhC nanocavities coupled with a single QD. On...
The detection of a small number of molecules in miniature amount of solution is of pivotal significance in many applications including biomedicine, homeland security, forensics, and environmental protection. Surface-Enhanced Raman scattering (SERS) offers the potential for label-free sensing of many chemicals due to its unprecedented sensitivity and specificity. However, the performance of SERS sensing...
The features of omnidirectional band gap (OBG) in the two-dimensional (2D) plasma photonic crystals (PPCs) with triangular lattices are theoretically investigated as the off-plane incidence wave vector is considered, which are composed of the unmagnetized plasma cylinders inserted into the homogeneous and isotropic dielectric background. The simulated results show that not only a flatbands region...
In this paper, the properties of photonic band gaps (PBGs) in two types of two-dimensional plasma-dielectric photonic crystals (2D PPCs) under transverse-magnetic (TM) wave are theoretically investigated by a novel modified plane wave expansion (PWE) method as Monte Carlo method is introduced. The configuration of 2D PPCs is the square lattices with fractal Sierpinski gasket structure whose constituents...
Ever since the introduction of metamaterials, intriguing applications have been proposed by metamaterial designs. An ε = μ = −1 slab will serve as a super lens to break diffraction limit. This slab, whose permittivity and permeability is with the same magnitude but of different sign to air, is the complementary medium to air. Lai et al. proposed the possibility to remote cloaking using complementary...
We theoretically investigated the optical absorption properties of graphene monolayer on the top of the truncated dielectric photonic crystals deposited on a prism in the visible range. Perfect absorption are realized since the Bloch modes are excited on the surface of the graphene monolayer. Furthermore, it is found that total absorption can be achieved at special oblique incident angles for both...
In our previous work, we use accidental degeneracy to realize conical dispersions at Γ point (k = 0) in two-dimensional (2D) photonic crystals (PCs) [1]. The conical dispersion consists of a triply degenerate state with two linear bands touching at the Dirac-like point and an additional flat band intersecting it at the same frequency. If the conical dispersion is derived from monopole and dipole excitations,...
Recently, the successful observation of topological transport of light boosts great enthusiasm to search new topological phases in artificial crystals for classical waves. By introducing anisotropic scatterers, here we propose a simple route to design topologically distinct photonic insulating phases that are characterized by opposite valley Chern numbers. The topological transition can be easily...
Recently, the emergence of topological edge state of matter raises new challenges in understanding the states of condensed matter and phase transitions beyond the the Ginzburg-Landau paradigm. The discovery of topological edge states of condensed matter also stimulate the development in other field, such as the realm of photonics, particularly in photonic crystals (PhCs). In this paper, we systematically...
Photonic graphene, photonic crystal with honeycomb lattice is studied in the work. Using both finite element simulations and microwave experiments, we studied the existence of the edge modes at different edges of this “photonic graphene”. The edge states are observed experimentally on the bearded interfaces of photonic crystals. The physics of the occurrence of these edge modes are discussed and we...
In a conventional optical resonator, the resonance transmission spectrum is always a Lorentz line shape, which is symmetrical with respect to the resonant wavelength. Recently, different configurations based on ring resonators [1], surface plasmons [2] and photonic crystal cavities [3] have been demonstrated to have asymmetric line shape, i.e., Fano resonance. Asymmetric profile in Fano resonance...
We investigate the spectral properties of a one-dimensional photonic crystal with the structural defect conjugated to the nanocomposite layer. The nanocomposite consists of spherical silver particles dispersed in the matrix. We demonstrate the possibility of implementing the hybrid state formed by the interaction between the optical Tamm and defect modes. It is shown that the hybrid state resonance...
Nonreciprocal optical effects have become a popular topic of research because of their wide range of applications, such as optical isolators and optical diodes for on-chip applications. With the rapid advances of meta-materials and photonic crystals, many new nonreciprocal phenomena were found and associated mechanisms were proposed over the past years. For example, one-way electromagnetic space wave...
Recently, optical devices with periodic structures are applied to metamaterial, holography, photonic crystals and so on. In particular, the research of photonic crystal or metamaterials is expected as application of optical confinement, optical switching or optical control, and also that of holography is expected as application of optical lens. As application of our structure, we consider an optical...
Optomechanical crystals are combinations of photonic and phononic crystals, which simultaneously control optical and acoustic waves with nanoscale periodic structure and form optomechanical systems with high mechanical frequency and lager photon-phonon interaction.
CMOS compatible lasers on silicon (Si) remain to be an active and challenging area of research for integrated Si photonics. Over the last few years, we have been working on heterogeneous integration of III–V/Si material systems for the development of various photonic crystal membrane lasers on silicon. Earlier we proposed and demonstrated a membrane reflector surface-emitting laser on silicon, based...
Critical coupling phenomena is a structure absorbs nearly 100% of incident electromagnetic energy, leading to null scattering. This strong light-matter interactions can lead to extremely compact and high performance photonic devices based on graphene and other two-dimensional materials. The graphene's surface conductivity is governed by the Kubo formula, Graphene cannot support plasmonic effects in...
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