97 research outputs found
Strong plasmonic confinement and optical force in phosphorene pairs
The plasmonic responses in the spatially separated phosphorene (single-layer black phosphorus) pairs are investigated, mainly containing the field enhancement, light confinement, and optical force. It is found that the strong anisotropic dispersion of black phosphorus gives rise to the direction-dependent symmetric and anti-symmetric plasmonic modes. Our results demonstrate that the symmetrical modes possess stronger field enhancement, higher light confinement, and larger optical force than the anti-symmetric modes in the nanoscale structures. Especially, the light confinement ratio and optical force for the symmetric mode along the armchair direction of black phosphorus can reach as high as >90% and >3000 pN/mW, respectively. These results may open a new door for the light manipulation at nanoscale and the design of black phosphorus based photonic devices
Tailoring Topological Edge States with Photonic Crystal Nanobeam Cavities
The realization of topological edge states (TESs) in photonic systems has
provided unprecedented opportunities for manipulating light in novel manners.
The Su-Schrieffer-Heeger (SSH) model has recently gained significant attention
and has been exploited in a wide range of photonic platforms to create TESs. We
develop a photonic topological insulator strategy based on SSH photonic crystal
nanobeam cavities. In contrast to the conventional photonic SSH schemes which
are based on alternately tuned coupling strength in one-dimensional lattice,
our proposal provides higher flexibility and allows tailoring TESs by
manipulating mode coupling in a two-dimensional manner. We reveal that the
proposed hole-array based nanobeams in a dielectric membrane can selectively
tailor single or double TESs in the telecommunication region by controlling the
coupling strength of the adjacent SSH nanobeams in both vertical and horizontal
directions. Our finding provides an in-depth understanding of the SSH model,
and allows an additional degree of freedom in exploiting the SSH model for
integrated topological photonic devices with unique properties and
functionalities
Performance evaluation of on-chip wavelength conversion based on InP/InGaAsP semiconductor waveguide platforms
We propose and design the high confinement InP/In1-xGaxAsyP1-y semiconductor
waveguides and report the results of effective wavelength conversion based on
this platform. Efficient confinement and mode field area fluctuation at
different wavelength is analyzed to achieve the high nonlinear coefficient. The
numerical results show that nearly zero phase-mismatch condition can be
satisfied through dispersion tailoring of InP/In1-xGaxAsyP1-y waveguides, and
the wavelength conversion ranging over 40 nm with the maximum conversion
efficiency -26.3 dB is achieved for fixing pump power 100 mW. Meanwhile, the
influences of the doping parameter y and pumping wavelength on the bandwidth
and conversion efficiency are also discussed and optimized. It is indicated the
excellent optical properties of the InP/In1-xGaxAsyP1-y waveguides and pave the
way towards direct integration telecom band devices on stand semiconductor
platforms.Comment: 21 page
Terahertz Sensor via Ultralow-Loss Dispersion-Flattened Polymer Optical Fiber: Design and Analysis
A novel cyclic olefin copolymer (COC)-based polymer optical fiber (POF) with a rectangular porous core is designed for terahertz (THz) sensing by the finite element method. The numerical simulations showed an ultrahigh relative sensitivity of 89.73% of the x-polarization mode at a frequency of 1.2 THz and under optimum design conditions. In addition to this, they showed an ultralow confinement loss of 2.18 × 10−12 cm−1, a high birefringence of 1.91 × 10−3, a numerical aperture of 0.33, and an effective mode area of 1.65 × 105 μm2 was obtained for optimum design conditions. Moreover, the range dispersion variation was within 0.7 ± 0.41 ps/THz/cm, with the frequency range of 1.0–1.4 THz. Compared with the traditional sensor, the late-model sensor will have application value in THz sensing and communication
Design and optimization of dispersion-flattened microarray-core fiber with ultralow loss for terahertz transmission
The paper establishes a late-model of microarray-core based polymer optical fiber with flattened dispersion and ultra-low losses. Its transmission properties are calculated by virtue of the beam propagation approach. From the simulation results, it finds that the modelled fiber has a near-zero dispersion property of 0.29 ± 0.16 ps/THz/cm in a frequency area of 1.05 THz to 1.78 THz, a high birefringence of 1.6 × 10-3, an ultra-low confinement loss of 3.78 × 10-10 dB/m, an effective mode field zone of 4.6 × 105 μm2, and a nonlinear coefficient of 1.2 km-1·W−1. With these good properties, the modelled fiber could be applied for ethanol detection and polarization maintaining THz applications
Optical sensors using chaotic correlation fiber loop ring down
We have proposed a novel optical sensor scheme based on chaotic correlation fiber loop ring down (CCFLRD). In contrast to the well-known FLRD spectroscopy, where pulsed laser is injected to fiber loop and ring down time is measured, the proposed CCFLRD uses a chaotic laser to drive a fiber loop and measures autocorrelation coefficient ring down time of chaotic laser. The fundamental difference enables us to avoid using long fiber loop as required in pulsed FLRD, and thus generates higher sensitivity. A strain sensor has been developed to validate the CCFLRD concept. Theoretical and experiment results demonstrate that the proposed method is able to enhance sensitivity by more than two orders of magnitude comparing to the existing FLRD method. We believe the proposed method could find great potential applications for chemical, medical, and physical sensing
Integrated and Spectrally Selective Thermal Emitters Enabled by Layered Metamaterials
Nanophotonic engineering of light-matter interaction at subwavelength scale
allows thermal radiation that is fundamentally different from that of
traditional thermal emitters and provides exciting opportunities for various
thermal-photonic applications. We propose a new kind of integrated and
electrically controlled thermal emitter that exploits layered metamaterials
with lithography-free and dielectric/metallic nanolayers. We demonstrate both
theoretically and experimentally that the proposed concept can create a strong
photonic bandgap in the visible regime and allow small impedance mismatch at
the infrared wavelengths, which gives rise to optical features of significantly
enhanced emissivity at the broad infrared wavelengths of 1.4-14 um as well as
effectively suppressed emissivity in the visible region. The electrically
driven metamaterial devices are optically and thermally stable at temperature
up to ~800 K with electro-optical conversion efficiency reaching ~30%. We
believe that the proposed high efficiency thermal emitters will pave the way
towards integrated infrared light source platforms for various thermal-photonic
applications and particularly provide a novel alternative for cost-effective,
compact, low glare, and energy-efficient infrared heating
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