scholarly journals Silicon Waveguide Optical Isolator with Directly Bonded Magneto-Optical Garnet

2019 ◽  
Vol 9 (3) ◽  
pp. 609 ◽  
Author(s):  
Yuya Shoji ◽  
Tetsuya Mizumoto
Keyword(s):  
Phase Shift ◽  
Transverse Electric ◽  
Core Layer ◽  
Transverse Magnetic ◽  
Silicon Waveguide ◽  
Optical Isolation ◽  
Tm Mode ◽  
Mode Converters ◽  
Optical Isolators ◽  
Thin Interlayer

Silicon waveguide optical isolators were fabricated by direct bonding of magneto-optical (MO) garnet. The technique allowed efficient MO phase shift owing to the use of single-crystalline garnet and negligibly thin interlayer on the silicon core layer. A Mach–Zehnder interferometer (MZI) provided optical isolation utilizing the MO phase shift. High isolation, wide bandwidth, and temperature-insensitive operations had been demonstrated by tailoring the MZI design. Also, transverse electric (TE)–transverse magnetic (TM) mode converters were integrated to control operating polarization. In this paper, we reviewed these progresses on silicon waveguide optical isolators.

scholarly journals A Broadband Polarization-Insensitive Graphene Modulator Based on Dual Built-in Orthogonal Slots Plasmonic Waveguide

2021 ◽  
Vol 11 (4) ◽  
pp. 1897
Author(s):  
Wei Chen ◽  
Yan Xu ◽  
Yang Gao ◽  
Lanjing Ji ◽  
Xibin Wang ◽  
...  
Keyword(s):  
High Speed ◽  
Transverse Electric ◽  
Modulation Depth ◽  
Transverse Magnetic ◽  
Plasmonic Effect ◽  
Te Mode ◽  
Tm Mode ◽  
Electro Optic ◽  
Polarization Insensitive ◽  
Electro Optic Modulator

A broadband polarization-insensitive graphene modulator has been proposed. The dual built-in orthogonal slots waveguide allows polarization independence for the transverse electric (TE) mode and the transverse magnetic (TM) mode. Due to the introduction of metal slots in both the vertical and horizontal directions, the optical field as well as the electro-absorption of graphene are enhanced by the plasmonic effect. The proposed electro-optic modulator shows a modulation depth of 0.474 and 0.462 dB/μm for two supported modes, respectively. An ultra-low effective index difference of 0.001 can be achieved within the wavelength range from 1100 to 1900 nm. The 3 dB-bandwidth is estimated to be 101 GHz. The power consumption is 271 fJ/bit at a modulation length of 20 μm. The proposed modulator provides high speed broadband solutions in microwave photonic systems.

The magnetotelluric transverse electric mode as a natural filter for static effects: Application to the COPROD2 and COPROD2S2 data sets

Geophysics ◽  
2014 ◽  
Vol 79 (2) ◽  
pp. E91-E99 ◽  
Author(s):  
Enrique Gómez-Treviño ◽  
Francisco J. Esparza ◽  
Yunuhen Muñiz ◽  
Armando Calderón
Keyword(s):  
Electromagnetic Induction ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Data Sets ◽  
Data Set ◽  
Te Mode ◽  
Tm Mode ◽  
Amplitude Data ◽  
Final Interpretation ◽  
Electric Mode

We regard the amplitude of the magnetotelluric impedance of the transverse electric (TE) mode as output, rather than input, in 2D inverse algorithms. The model obtained in the inversion is in this context only an intermediate product whose TE theoretical response is for all intents and purposes the object of the inversion. The input is the amplitude of the transverse magnetic (TM) mode and the phases of both modes. They are fitted as much as possible by relaxing regularization to its limits, allowing the model to include features not strictly required by the data, but still required by the amplitude of the TE curves. We propose two tests to guaranty the accuracy and reliability of the recovery. The first is a convergence test whereby the output is monitored as a function of the roughness of the model. Second, the TM amplitude data are multiplied by different factors and the output is checked for consistency with the previous test. The resulting TE responses have only electromagnetic induction effects and thus are free from static shifts due to electric charges. We apply the procedure to the synthetic COPROD2S2 data set and compute static factors for TE and TM modes. We propose an image based on depth averages of conductivity along with a nonlinear resolution-variance analysis of the image as the final interpretation of the data. The procedure is also applied to the well-known COPROD2 field data set.

scholarly journals Polarization-Insensitive Phase Modulators Based on an Embedded Silicon-Graphene-Silicon Waveguide

2019 ◽  
Vol 9 (3) ◽  
pp. 429 ◽  
Author(s):  
Xinhai Zou ◽  
Yujia Zhang ◽  
Zhihui Li ◽  
Yiwei Yang ◽  
Shangjian Zhang ◽  
...  
Keyword(s):  
Wavelength Range ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Waveguide Structure ◽  
Phase Modulator ◽  
Modulation Bandwidth ◽  
Silicon Waveguide ◽  
Phase Modulators ◽  
Compact Size ◽  
Polarization Insensitive

A polarization-insensitive phase modulator concept is presented, based on an embedded silicon-graphene-silicon waveguide. Simulation results show that the effective mode index of both transverse electric (TE) and transverse magnetic (TM) modes in the silicon-graphene-silicon waveguide undergoes almost the same variations under different biases across a broad wavelength range, in which the real-part difference is less than 1.2 × 10−3. Based on that, a polarization-insensitive phase modulator is demonstrated, with a 3-dB modulation bandwidth of 135.6 GHz and a wavelength range of over 500 nm. Moreover, it has a compact size of 60 μm, and a low insertion loss of 2.12 dB. The proposed polarization-insensitive waveguide structure could be also applied to Mach-Zehnder modulators and electro-absorption modulators.

ENHANCED TRANSMISSION OF PLASMONIC WAVEPLATES WITH A PERIODIC ARRAY OF NANORECTANGLES

2012 ◽  
Vol 26 (11) ◽  
pp. 1250070 ◽  
Author(s):  
HENGYI LI ◽  
XIANGANG LUO ◽  
ZHEN GUO ◽  
KUNHUA WEN ◽  
LIANSAN YAN
Keyword(s):  
Phase Shift ◽  
Transverse Electric ◽  
Polarized Light ◽  
Transverse Magnetic ◽  
Periodic Array ◽  
Transmission Ratio ◽  
Enhanced Transmission ◽  
Simulation Results

Plasmonic waveplates with enhanced transmission can be achieved in the proposed structure with a periodic array of nanorectangles. Based on the model of nanoslits, both the transverse electric (TE) and transverse magnetic (TM) waves can be transmitted through the nanorectangles, enhancing the transmission of the incident polarized light. Simulation results show that the transmission ratio and phase shift of TE and TM waves can be manipulated by the nanorectangles structures, enabling plasmonic waveplates with enhanced transmission.

scholarly journals Modelling of Terrain Effect from the Magnetotelluric (MT) Field Data

2019 ◽  
Vol 9 (2) ◽  
pp. 5059-5062
Keyword(s):  
Finite Difference ◽  
Rayleigh Scattering ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Impedance Tensor ◽  
Topographic Features ◽  
Te Mode ◽  
Tm Mode ◽  
Terrain Effect ◽  
Computation Algorithm

Magnetotelluric (MT) data were recorded over highly undulating terrain in Himalayan region from Roorkee to Gangotri section in period 0.001-1000 second. In the presence of topographic distortion the interpretation may become misleading. A simple scheme based on finite difference method for the simulation of the topographic distortion in magnetotelluric response is presented. The finite difference based, forward response computation algorithm, has been extended for undulating topography. The distortion coefficients, representing the topographic effect, are designed for correcting the observed distorted impedance tensor recorded in the vicinity of topographic features. The accuracy of the scheme is checked by comparing the computed responses with the finite element, Rayleigh scattering and transmission surface results for transverse electric (TE-mode) and transverse magnetic (TM-mode) responses. The modified algorithm is used to model the terrain effect on MT data recorded from Himalayan terrain.

scholarly journals 10 nm SiO2 TM Slot Mode in Laterally Mismatched Asymmetric Fin-Waveguides

2021 ◽  
Vol 9 ◽  
Author(s):  
James Byers ◽  
Kapil Debnath ◽  
Hideo Arimoto ◽  
Muhammad K. Husain ◽  
Moïse Sotto ◽  
...  
Keyword(s):  
Transverse Electric ◽  
Mode Conversion ◽  
Transverse Magnetic ◽  
Silicon On Insulator ◽  
Si Photonics ◽  
Te Mode ◽  
Tm Mode ◽  
Transmission Data ◽  
Fdtd Simulations ◽  
Difference Time

In this paper we demonstrate that by breaking the left/right symmetry in a bi-planar double-silicon on insulator (SOI) photonic crystal (PhC) fin-waveguide, we can couple the conventionally used transverse-electric (TE) polarized mode to the transverse-magnetic (TM) polarization slot-mode. Finite difference time domain (FDTD) simulations indicate that the TE mode couples to the robust TM mode inside the Brillouin zone. Broadband transmission data shows propagation identified with horizontal-slot TM mode within the TE bandgap for fully mismatched fabricated devices. This simultaneously demonstrates TE to TM mode conversion, and the narrowest Si photonics SiO2 slot-mode propagation reported in the literature (10 nm wide slot), which both have many potential telecommunication applications.

Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

2020 ◽  
Vol 91 (3) ◽  
pp. 30901
Author(s):  
Yibo Tang ◽  
Longhui He ◽  
Jianming Xu ◽  
Hailang He ◽  
Yuhan Li ◽  
...  
Keyword(s):  
Transverse Electric ◽  
Surface Current ◽  
Dielectric Substrate ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Single Peak ◽  
Wide Angle ◽  
Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

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