Numerical analysis of Bragg grating-based slot-micro-ring coupling resonator system for electromagnetically-induced transparency-like effect

2020 ◽  
Vol 34 (28) ◽  
pp. 2050307
Author(s):  
C. Y. Zhao ◽  
P. Y. Chen ◽  
C. M. Zhang
Keyword(s):  
Light Field ◽  
Slow Light ◽  
Spectral Response ◽  
Incident Light ◽  
Extinction Ratio ◽  
Fdtd Method ◽  
Resonant Peak ◽  
Bragg Grating ◽  
Slot Waveguide ◽  
Sensor Structure

We propose a novel bio-sensor structure composed of double sided-wall Bragg gratings and dual-slot-micro-ring waveguides. The slot waveguide is a better choice to interact the bio-material under investigation with the propagating light with in the slot region. The incident light field propagates clockwise through the slot micro-ring resonator, the reflection light field propagates counterclockwise in the slot Bragg grating. By optimizing the geometric parameters of the device, the spectral response is tailored to obtain a sharp resonant peak simulated by the finite- difference time-domain (FDTD) method. The spectrum can be tuned not only by geometrically changing the couple distance in slot Bragg grating resonator, but also by dynamically altering the depth and number of the Bragg grating. Furthermore, the device is easy to yield an extinction ratio of 11 dB, a FWHM of 1.1 nm and a quality factor of [Formula: see text]. The device with a small footprint can enable integration with some photonic devices on a chip and have great promising for applications including tunable sensors, slow-light devices and optical communication.

Quadruple plasmon-induced transparency and tunable multi-frequency switch in monolayer graphene terahertz metamaterial

2022 ◽  
Author(s):  
Yuhui Li ◽  
Yiping Xu ◽  
Jiabao Jiang ◽  
Liyong Ren ◽  
Shubo Cheng ◽  
...  
Keyword(s):  
Electric Field ◽  
Modulation Depth ◽  
Spectral Response ◽  
Incident Light ◽  
Extinction Ratio ◽  
Fdtd Method ◽  
Monolayer Graphene ◽  
Destructive Interference ◽  
Induced Transparency ◽  
Plasmon Induced Transparency

Abstract A monolayer graphene metamaterial composed of a graphene block and four graphene strips, which has the metal-like properties in terahertz frequency range, is proposed to generate an outstanding quadruple plasmon-induced transparency (PIT). Additional analyses show that the forming physical mechanism of the PIT with four transparency windows can be explained by strong destructive interference between the bright mode and the dark mode, and the distributions of electric field intensity and electric field vectors under the irradiation of the incident light. Coupled mode theory (CMT) and finite-difference time-domain (FDTD) method are employed to study the spectral response characteristics of the proposed structure, and the theoretical and simulated results are in good agreement. It is found that a tunable multi-frequency switch and excellent optical storage can be achieved in the wide PIT window. The maximum modulation depth is up to 99.7%, which corresponds to the maximum extinction ratio of 25.04 dB and the minimum insertion loss of 0.19 dB. In addition, the time delay is as high as 0.919 ps, the corresponding group refractive index is up to 2755. Thus, the proposed structure provides a new method for the design of terahertz multi-frequency switches and slow light devices.

Numerical analysis of effective refractive index bio-sensor based on graphene-embedded slot-based dual-micro-ring resonator

2020 ◽  
Vol 34 (17) ◽  
pp. 2050145
Author(s):  
C. Y. Zhao ◽  
P. Y. Chen ◽  
P. Y. Li ◽  
C. M. Zhang
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Extinction Ratio ◽  
Fdtd Method ◽  
Ring Resonators ◽  
Compact Structure ◽  
Coupled Mode ◽  
Mode Field ◽  
Sensor Structure ◽  
On Chip ◽  
Induced Transparency

We propose a novel bio-sensor structure composed of slot dual-micro-ring resonators and mono-layer graphene. Based on the electromagnetically induced transparency (EIT)-like phenomenon and the light-absorption characteristics of graphene, we present a theoretical analysis of transmission by using the coupled mode theory and Kubo formula. The results demonstrate the EIT-like spectrum with asymmetric line profile. The mode-field distributions of transmission spectrum are obtained from 3D simulations based on finite-difference time-domain (FDTD) method. Our bio-sensor exhibits theoretical sensitivity of 330 nm/RIU, a minimum detection limit of [Formula: see text] RIU, the maximum extinction ratio of 4.4 dB, the quality factor of [Formula: see text] and a compact structure of [Formula: see text]. Finally, the bio-sensor’s performance is simulated for glucose solution. Our proposed design provides a promising candidate for on-chip integration with other silicon photonic element.

Tunable anisotropic plasmon-induced transparency in black phosphorus-based metamaterials

2021 ◽  
Author(s):  
Li Huang ◽  
Zhongpeng Jia ◽  
Bin Tang
Keyword(s):  
Slow Light ◽  
Incident Light ◽  
Fdtd Method ◽  
Infrared Region ◽  
Photonic Devices ◽  
Black Phosphorus ◽  
Lorentz Oscillator ◽  
New Type ◽  
Induced Transparency ◽  
Plasmon Induced Transparency

Abstract Black phosphorus (BP), as a new type of two-dimensional material, has drawn considerable interest because of its distinct physics and electronic characteristics. In this work, we theoretically present a BP-based metamaterial, unit cell of which is composed of a rectangular BP nano-patch and two parallel BP strips. The research results indicate that tunable anisotropic plasmon-induced transparency (PIT) effect can be achieved in the presented metamaterials when the polarization of incident light is along armchair and zigzag directions of BP crystal, respectively. Moreover, the spectra responses and group delay accompanied by the PIT effect can be actively controlled by adjusting the carrier density and geometric parameters. The electromagnetic simulation results calculated by finite-difference time-domain (FDTD) method show good agreement with the coupled Lorentz oscillator model. Our proposed nanostructure provides a new path for designing photonic devices such as slow light and photodetector in the mid-infrared region.

scholarly journals Group Velocity Modulation and Light Field Focusing of the Edge States in Chirped Valley Graphene Plasmonic Metamaterials

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1808
Author(s):  
Liqiang Zhuo ◽  
Huiru He ◽  
Ruimin Huang ◽  
Shaojian Su ◽  
Zhili Lin ◽  
...  
Keyword(s):  
Group Velocity ◽  
Light Field ◽  
Slow Light ◽  
Dielectric Materials ◽  
Degree Of Freedom ◽  
Geometrical Parameters ◽  
Edge States ◽  
Velocity Modulation ◽  
Plasmonic Metamaterials ◽  
On Chip

The valley degree of freedom, like the spin degree of freedom in spintronics, is regarded as a new information carrier, promoting the emerging valley photonics. Although there exist topologically protected valley edge states which are immune to optical backscattering caused by defects and sharp edges at the inverse valley Hall phase interfaces composed of ordinary optical dielectric materials, the dispersion and the frequency range of the edge states cannot be tuned once the geometrical parameters of the materials are determined. In this paper, we propose a chirped valley graphene plasmonic metamaterial waveguide composed of the valley graphene plasmonic metamaterials (VGPMs) with regularly varying chemical potentials while keeping the geometrical parameters constant. Due to the excellent tunability of graphene, the proposed waveguide supports group velocity modulation and zero group velocity of the edge states, where the light field of different frequencies focuses at different specific locations. The proposed structures may find significant applications in the fields of slow light, micro–nano-optics, topological plasmonics, and on-chip light manipulation.

scholarly journals Slow-light all-optical soliton diode based on tailored Bragg-grating structure

2015 ◽  
Vol 40 (11) ◽  
pp. 2572 ◽  
Author(s):  
Hongji Li ◽  
Zhigui Deng ◽  
Jiasheng Huang ◽  
Shenhe Fu ◽  
Yongyao Li
Keyword(s):  
Slow Light ◽  
Optical Soliton ◽  
Bragg Grating ◽  
Grating Structure ◽  
All Optical

scholarly journals Estimating Underwater Light Regime under Spatially Heterogeneous Sea Ice in the Arctic

2018 ◽  
Vol 8 (12) ◽  
pp. 2693 ◽  
Author(s):  
Philippe Massicotte ◽  
Guislain Bécu ◽  
Simon Lambert-Girard ◽  
Edouard Leymarie ◽  
Marcel Babin
Keyword(s):  
Sea Ice ◽  
Water Column ◽  
Attenuation Coefficient ◽  
Vertical Profile ◽  
Light Field ◽  
Incident Light ◽  
Single Point ◽  
The Arctic ◽  
Large Area ◽  
Average Irradiance

The vertical diffuse attenuation coefficient for downward plane irradiance ( K d ) is an apparent optical property commonly used in primary production models to propagate incident solar radiation in the water column. In open water, estimating K d is relatively straightforward when a vertical profile of measurements of downward irradiance, E d , is available. In the Arctic, the ice pack is characterized by a complex mosaic composed of sea ice with snow, ridges, melt ponds, and leads. Due to the resulting spatially heterogeneous light field in the top meters of the water column, it is difficult to measure at single-point locations meaningful K d values that allow predicting average irradiance at any depth. The main objective of this work is to propose a new method to estimate average irradiance over large spatially heterogeneous area as it would be seen by drifting phytoplankton. Using both in situ data and 3D Monte Carlo numerical simulations of radiative transfer, we show that (1) the large-area average vertical profile of downward irradiance, E d ¯ ( z ) , under heterogeneous sea ice cover can be represented by a single-term exponential function and (2) the vertical attenuation coefficient for upward radiance ( K L u ), which is up to two times less influenced by a heterogeneous incident light field than K d in the vicinity of a melt pond, can be used as a proxy to estimate E d ¯ ( z ) in the water column.

Tunable plasmonic-induced transparency based on stub-coupled cascade ring resonator with electro-optical material

2019 ◽  
Vol 33 (18) ◽  
pp. 1950206
Author(s):  
Fang Chen ◽  
Huafeng Zhang ◽  
Lihui Sun ◽  
Jijun Li ◽  
Chunchao Yu
Keyword(s):  
Slow Light ◽  
Ring Resonator ◽  
Optical Switch ◽  
Fdtd Method ◽  
Optical Material ◽  
Ring Resonators ◽  
Refractive Index Sensor ◽  
External Voltage ◽  
All Optical Switch ◽  
Induced Transparency

The electrical control of plasmonic-induced transparency (PIT) via a resonator waveguide system is presented. The proposed structure is composed of a stub and cascade ring resonator. The ring and the stub resonator are filled with electro-optical material which can control the resonance frequency by the external voltage. Two-dimensional finite difference time domain (2D FDTD) method is used to calculate the transmission and field distribution. Single PIT is investigated both by FDTD and Coupled Mode Theory (CMT). The proposed PIT can be tuned by changing the external voltage or the geometric parameters. Double and triple PIT can be obtained by introducing more ring resonators and can be tuned by external voltage. The proposed plasmonic structure may have application in slow light device, nanoscale filter, all-optical switch and refractive index sensor.

The Signal Characteristics of the Spectral Response of Bragg Grating Sensor Embedded in Composite Laminated after the Cure Process

2006 ◽  
Vol 514-516 ◽  
pp. 629-632 ◽  
Author(s):  
Carlos A. Ramos ◽  
Orlando Frazão ◽  
Ireneu Dias ◽  
António Torres Marques
Keyword(s):  
Optical Fibre ◽  
Optical Spectrum ◽  
Spectral Response ◽  
Bragg Grating ◽  
Stacking Sequence ◽  
Cure Process ◽  
Geometric Configurations ◽  
Signal Characteristics ◽  
Bragg Grating Sensor ◽  
Spectrum Response

The objective of this work was to study, understand and evaluate the effect of different geometric configurations of carbon plies, in the reflected wavelength spectrum of Bragg grating structure together with the effect of the recoating process of the sensor. The different possibilities depend upon the orientation and location of the optical fibre relative to the composite reinforcement orientation and the presence/absence of recoating. The material stacking sequence and the cure conditions were are also studied and the influence of the different possibilities was considered. The optical spectrum response obtained by the interaction of the optical fibre with the host material is shown.

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