scholarly journals Single-mode optical waveguides on native high-refractive-index substrates

APL Photonics ◽  
2016 ◽  
Vol 1 (7) ◽  
pp. 071302 ◽  
Author(s):  
Richard R. Grote ◽  
Lee C. Bassett
Keyword(s):  
Refractive Index ◽  
Optical Waveguides ◽  
Single Mode ◽  
High Refractive Index

scholarly journals Numerical analysis of planar multimode optical sensor with active nanolayer

2020 ◽  
Vol 50 (3) ◽  
Author(s):  
Marek Błahut
Keyword(s):  
Refractive Index ◽  
Optical Sensor ◽  
Single Mode ◽  
High Refractive Index ◽  
Field Analysis ◽  
Multimode Waveguide ◽  
Sensor Layer ◽  
Active Sensor ◽  
Mode Field ◽  
Numerical Studies

In the paper, numerical studies of the model of an optical sensor, based on interference of modes in a planar one-dimensional step-index configuration, are presented. Calculations are performed using the method of mode field analysis. The structure consists of the single-mode input waveguide, the multimode waveguide that guides only a few modes and the single-mode output waveguide. The structure is covered by a nanometer active sensor layer of a high refractive index, which changes its optical properties in contact with the measured external surrounding. The refractive index variation of an active sensor layer affects the modal properties of the multimode waveguide and the output optical field distribution. By the proper selection of the active layer, the considered configuration can be used for gas detection.

scholarly journals Simulating the effects of refractive index difference on the coupling efficiency of periodically segmented waveguide mode converter

2021 ◽  
Vol 51 (4) ◽  
Author(s):  
Yu Zheng ◽  
Hao He ◽  
Lianqiong Jiang ◽  
Ji’an Duan
Keyword(s):  
Refractive Index ◽  
Optical Waveguides ◽  
High Efficiency ◽  
Transmission Loss ◽  
Structural Parameters ◽  
Coupling Efficiency ◽  
Single Mode ◽  
Efficient Operation ◽  
Refractive Index Difference ◽  
Efficient Coupling

Efficient coupling of micro/nano-optical waveguides with single-mode fibers is the premise for the efficient operation of the integrated photonic chip, which directly determines its optical performance. In this paper, the design principles of periodically segmented waveguide (PSW) structure used for high-efficiency fiber-chip coupling are proposed, and the effects of refractive index difference Δ on coupling efficiency and structural parameters are studied by simulation. It is found that as the Δ of the PSW increases, the period of the PSW tends to be smaller, and the coupling efficiency decreases continuously, reduced by around 0.673 dB in the range of Δ = 3% to Δ = 7%. Through the analysis of PSW optical mechanisms, it demonstrates that the main reason for the decrease of coupling efficiency is that the transmission loss of the tapered section increases sharply with the increase of Δ. High-Δ PSW is difficult to apply to highly integrated silica optical chips due to the unignorably insertion loss.

Room temperature phosphorescent organic materials for optical waveguides

2021 ◽  
Author(s):  
Mallesham Godumala ◽  
Avulu Vinod Kumar ◽  
Rajadurai Chandrasekar
Keyword(s):  
Refractive Index ◽  
Electromagnetic Fields ◽  
Optical Waveguides ◽  
Room Temperature ◽  
Organic Materials ◽  
High Refractive Index ◽  
Molecular Solids ◽  
Direction Parallel ◽  
One Dimensional

Organic optical waveguides (OWGs) are high refractive index one-dimensional molecular solids used to guide electromagnetic fields in a direction parallel to their long axis. OWGs attract a great deal of...

scholarly journals Single Mode High Refractive Index Optical Fibres

2008 ◽  
Vol 114 (6A) ◽  
pp. A-63-A-68 ◽  
Author(s):  
D. Dorosz ◽  
K. Barczak ◽  
T. Pustelny ◽  
J. Dorosz
Keyword(s):  
Refractive Index ◽  
Single Mode ◽  
High Refractive Index ◽  
Optical Fibres

scholarly journals Повышение эффективности интегрально-оптического сверхпроводящего датчика одиночных фотонов на подложке ниобата лития за счет дополнительного покровного слоя с высоким показателем преломления

2020 ◽  
Vol 46 (16) ◽  
pp. 39
Author(s):  
М.В. Парфенов ◽  
А.В. Шамрай
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Lithium Niobate ◽  
Optical Waveguides ◽  
Optical Radiation ◽  
High Refractive Index ◽  
Niobium Nitride ◽  
Superconducting Layer ◽  
Waveguide Modes ◽  
Absorption Of Light

A mechanism of amplification of interaction between optical radiation and superconducting niobium nitride thin film placed on the surface of optical waveguides, which are fabricated on lithium niobate substrate, is investigated. This effect can be obtained with help of an additional covering layer with high refractive index. It was shown that adiabatic deformation of waveguide modes can increase absorption of light in a superconducting layer up to ~ 1 dB/µm, making it possible to fabricate a SSPD on lithium niobate with quantum efficiency of about 70%.

scholarly journals Single Mode, Air-Cladded Optical Waveguides Supported by a Nano-Fin Fabricated with Direct Laser Writing

2021 ◽  
Vol 11 (14) ◽  
pp. 6327
Author(s):  
Parvinder K. Gill ◽  
Dan M. Marom
Keyword(s):  
Optical Waveguides ◽  
Single Mode ◽  
High Refractive Index ◽  
Propagation Loss ◽  
Solid Core ◽  
Direct Laser Writing ◽  
Laser Writing ◽  
Direct Laser ◽  
Wavelength Scale ◽  
Photonic Interconnects

Single-mode, air-cladded optical waveguides have wavelength scale diameters, making them very fragile and difficult to handle and yet highly desirable for sensing and inter-chip photonic interconnects. These contradictory qualities are resolved in this work by supporting the optical waveguide with a nano-fin structure attached to a substrate, narrow enough and sufficiently tall to minimally impact the wave-guiding metrics of the solid core while providing structural mechanical integrity. The design considerations for the nano-fin-supported waveguide and its realization using a commercial direct laser writing system based on two-photon activation of a photopolymer is reported herein. The 3D printed waveguides are characterized and experimentally assessed, demonstrating low birefringence and an estimated propagation loss for LP01x and LP01y of 2.9 dB/mm and 3.4 dB/mm, respectively, attributed to surface roughness and the relatively high refractive index contrast with air.

scholarly journals Enhancing the Sensitivity of SMS Fiber Sensors by the Use of High Refractive Index Coatings

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1106
Author(s):  
Thulio Vette ◽  
Gustavo Burns ◽  
Renato Bellini ◽  
Sergio S. Camargo Jr. ◽  
Carolina V. S. Borges ◽  
...  
Keyword(s):  
Refractive Index ◽  
Carbon Coating ◽  
External Medium ◽  
Single Mode ◽  
High Refractive Index ◽  
Diamond Like Carbon ◽  
Fiber Sensors

This paper presents a study on the behavior of single-mode/multimode/single-mode sensors with diamond-like carbon coating of high refractive index. Spectra and response for different values of the external medium refractive index are recorded and analyzed.

TEM characterization of proton-exchanged LiNbO3 optical waveguides

1986 ◽  
Vol 44 ◽  
pp. 480-481
Author(s):  
W. E. Lee
Keyword(s):  
Refractive Index ◽  
Benzoic Acid ◽  
Optical Waveguides ◽  
Total Internal Reflection ◽  
Index Of Refraction ◽  
Optical Measurements ◽  
Lithium Ions ◽  
Wide Channel ◽  
Tem Characterization

An optical waveguide consists of a several-micron wide channel with a slightly different index of refraction than the host substrate; light can be trapped in the channel by total internal reflection.Optical waveguides can be formed from single-crystal LiNbO3 using the proton exhange technique. In this technique, polished specimens are masked with polycrystal1ine chromium in such a way as to leave 3-13 μm wide channels. These are held in benzoic acid at 249°C for 5 minutes allowing protons to exchange for lithium ions within the channels causing an increase in the refractive index of the channel and creating the waveguide. Unfortunately, optical measurements often reveal a loss in waveguiding ability up to several weeks after exchange.

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