scholarly journals Improved Optical Waveguide Microcantilever for Integrated Nanomechanical Sensor

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4346 ◽  
Author(s):  
Jing ◽  
Fan ◽  
Wang ◽  
Zhang ◽  
Cai ◽  
...  
Keyword(s):  
Optical Waveguide ◽  
Optical Loss ◽  
High Sensitivity ◽  
Maximum Sensitivity ◽  
Coupling Loss ◽  
Optical Losses ◽  
Optimum Length ◽  
Conventional Structure

This paper reports on an improved optical waveguide microcantilever sensor with high sensitivity. To improve the sensitivity, a buffer was introduced into the connection of the input waveguide and optical waveguide cantilever by extending the input waveguide to reduce the coupling loss of the junction. The buffer-associated optical losses were examined for different cantilever thicknesses. The optimum length of the buffer was found to be 0.97 μm for a cantilever thickness of 300 nm. With this configuration, the optical loss was reduced to about 40%, and the maximum sensitivity was more than twice that of the conventional structure.

POLYCYANURATE THIN FILM OPTICAL WAVEGUIDE FOR INTEGRATED OPTICS APPLICATIONS

2003 ◽  
Vol 12 (01) ◽  
pp. 1-5 ◽  
Author(s):  
SUDHIR KUMAR SHARMA ◽  
S. C. K. MISRA ◽  
K. N. TRIPATHI
Keyword(s):  
Refractive Index ◽  
Optical Waveguide ◽  
Optical Loss ◽  
Dip Coating ◽  
Optical Losses ◽  
Integrated Optical ◽  
Integrated Optical Devices ◽  
Fabrication And Characterization ◽  
Dip Coating Technique

This paper reports on the fabrication and characterization of polymer optical waveguide. The polymer films were used by dip coating technique. Various waveguide parameters such as refractive index, optical losses, thickness of guide has been reported. Polycyanurate synthesized as planar optical waveguide exhibits low optical loss (< 2 dB/cm) having refractive index 1.592 and excellent absorption spectra in the wavelength range (1540–1560 nm) which makes this polymer promising for integrated optical devices.

ORMOCER®s (Organic-Inorganic Hybrid Polymers) for Telecom Applications: Structure/Property Correlations

2004 ◽  
Vol 847 ◽  
Author(s):  
Frank Kahlenberg ◽  
Michael Popall
Keyword(s):  
Optical Waveguide ◽  
Uv Light ◽  
Structural Characteristics ◽  
Optical Loss ◽  
Structure Property ◽  
Optical Losses ◽  
Hybrid Polymers ◽  
Inorganic Hybrid ◽  
Sensitive Film ◽  
Property Correlations

ABSTRACTThe development and characterization of fluoroaryl functionalized organic-inorganic hybrid polymers for optical waveguide applications is presented. The materials are prepared from organoalkoxysilanes in a two-step process. The first step is the formation of the inorganic polysiloxane network by hydrolysis and polycondensation in order to obtain a soluble resin. This can be mixed with a photo initiator and applied onto a substrate as a photo-sensitive film. Micro patterns (waveguides with core and cladding) are then manufactured in a second step by exposure to UV-light through a mask. The polymers are characterized with respect to application in the fabrication of telecom optical waveguide devices. Thus, special attention is turned to optical losses in the telecom wavelengths at 1310 nm and 1550 nm as well as to refractive indices. During all stages of ORMOCER® preparation, structure-property correlations are deduced from presented characterization data.Various spectroscopic tools give an insight into network structures of polycondensate resins and cured hybrid polymer samples. 29Si-NMR in particular is used for the quantitative analysis of siloxane species. With the aid of molecular modeling, structural characteristics of oligomeric intermediates as determined by experiment are visualized. ORMOCER® resins with low optical losses of 0.28 dB/cm at 1310 nm and 0.42 dB/cm at 1550 nm, respectively, are prepared. Subsequent micropatterning by means of photolithography results in waveguide and other test patterns. A low optical loss of 0.51 dB/cm at 1550 nm is measured on a waveguide manufactured from a photopatternable fluoroaryl functionalized ORMOCER®.

AN EASY APPROACH FOR ESTIMATING ABSORPTION LOSS IN ORGANIC THIN SOLID FILMS

1999 ◽  
Vol 08 (04) ◽  
pp. 519-525
Author(s):  
SHEN YUQUAN ◽  
LI ZHAO ◽  
ZHAO YUXIA ◽  
ZHAI JIANFENG ◽  
ZHOU JIAYUN ◽  
...  
Keyword(s):  
Spectroscopic Method ◽  
Optical Loss ◽  
Polymeric Films ◽  
Absorption Loss ◽  
Optical Losses ◽  
Thin Solid Films ◽  
Solid Films ◽  
Near Ir ◽  
Ir Spectroscopic

An UV-VIS-Near-IR spectroscopic method for determination of optical loss in organic/polymeric films has been suggested. The optical losses of two polyimide polymers with push-pull azobenzene chromophore attached were examined by this method and the data were calibrated by conventional optical method.

Synthesis of Photosensitive Organic-Inorganic Hybrid Polymers via Anhydrous Sol-Gel Process for Integrated Optics

2003 ◽  
Vol 780 ◽  
Author(s):  
Xinshi Luo ◽  
Congji Zha ◽  
Barry Luther-Davies
Keyword(s):  
Low Cost ◽  
Sol Gel ◽  
Optical Loss ◽  
Hybrid Polymer ◽  
Optical Losses ◽  
Hybrid Polymers ◽  
Inorganic Hybrid ◽  
Wide Range ◽  
Integrated Optical ◽  
Sol Gel Process

AbstractPhotosensitive organic-inorganic hybrid polymers were synthesised for integrated optical and optoelectronic devices by a non-hydrous sol-gel process of hydrolysis/condensation of 3-methacryloxypropyltrimethoxysilane (MPS), diphenyldimethoxysilane (DPhDMS), and zirconium isopropoxide (TPZ) with boric acid under anhydrous conditions. The methacryl groups of MPS are UVpolymerizable, which are suitable for low cost fabrication of waveguides with a “UV write/develop” process. The incorporation of DPhDMS and TPZ was found useful in reducing the optical loss and in enhancing the thermostability of the polymer. The refractive index of the hybrid polymer is tuneable from 1.4950 to 1.5360 by variation of the ratio among MPS, DPhDMS and TPZ. Optical characterisation showed that the material has low optical losses at the telecommunications windows (0.16 dB/cm at 1310 nm and 0.4 dB/cm at 1550nm). The hybrid polymer also showed a low birefringence (1.2×10-4), a large thermo-optic (TO) coefficient (-2.77 ×10-4), and an outstanding linearity of dn/dT in a wide range of temperature (from 25 °C to 200 °C). Waveguides forming ability for the hybrid polymer with UV imprinting was also demonstrated.

Optical Losses in Ferroelectric Oxide Thin Films: Is There Light at the End of the Tunnel?

1994 ◽  
Vol 361 ◽  
Author(s):  
D. K. Fork ◽  
F. Armani-Leplingard ◽  
J. J. Kingston
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Optical Loss ◽  
Film Surface ◽  
Film Structure ◽  
Surface Scattering ◽  
Morphological Development ◽  
Optical Losses ◽  
Force Microscopy ◽  
Device Applications

ABSTRACTOptical losses are a barrier to use of ferroelectric waveguide thin films. Losses of about 2 dB/cm will reduce the efficiency of a frequency doubler by over 50%. Achieving losses on this order in conjunction with other essential film properties is difficult. The optical loss has several origins, including absorption, mode leakage, internal scattering and surface scattering. When the film surface morphology is accurately known, it is possible to estimate the surface scattering component of the loss. We have employed atomic force microscopy and computer modeling to compute, and correlate the optical loss as a function of film thickness and wavelength. The results suggest upper limits to the morphological roughness for various device applications. For lithium niobate films on sapphire which are intended to frequency double into the blue part of the spectrum, the optimal film thickness is about 400 nm and the RMS roughness is constrained below about 1.0 nm, with some weak dependence on grain size. Although present growth techniques do not appear to achieve this level of surface flatness intrinsically, an understanding of the morphological development of the film structure may lead to improvements.

Microstructure and optical loss in epitaxial (Pb, La)TiO3 thin films on (001) MgO

1998 ◽  
Vol 13 (4) ◽  
pp. 995-1001 ◽  
Author(s):  
Young Min Kang ◽  
Sunggi Baik
Keyword(s):  
Thin Films ◽  
Smooth Surface ◽  
Optical Loss ◽  
Optical Losses ◽  
Coupling Technique ◽  
Optical Propagation ◽  
Domain Boundaries ◽  
Propagation Losses ◽  
La Substitution ◽  
Surface Morphologies

Surface morphologies and microstructures of epitaxial (Pb1−xLax)TiO3 (PLT, x = 0.00, 0.08, 0.16, and 0.24) thin films grown on (001) MgO have been investigated using SEM, AFM, and TEM. Surface roughness of PLT films varies severely with La concentration. For 0.08La-PLT film, very smooth surface has been achieved with 9.3 Å of RMS roughness. 0.00La- and 0.08La-PLT films show 90° domain structure, and periodic dimension of the domain is reduced by La substitution. 0.16La- and 0.24La-PLT films show the presence of triangular grains, causing rough surface and poor crystal quality. However, they are distributed uniformly in 0.16La-PLT film while agglomerated in 0.24La-PLT film. Optical propagation losses of PLT films measured by prism coupling technique were 22.3, 6.0, 11.4, and 20.7 dB/cm for x = 0.00, 0.08, 0.16, and 0.24, respectively. Such a variation in optical losses seemed to be due to the surface morphology and abundance of domain boundaries that change continuously as a function of La concentration in epitaxial PLT thin films.

scholarly journals Highly Sensitive Plasmonic Refractive Index Sensor Based on Dual D-Shaped Photonic Crystal Fiber with Aluminum Nitride-Silver Films

2021 ◽  
Author(s):  
Sanfeng Gu ◽  
Wei Sun ◽  
Meng Li ◽  
Ming Deng
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Aluminum Nitride ◽  
Photonic Crystal Fiber ◽  
Low Cost ◽  
Optical Loss ◽  
High Sensitivity ◽  
Resonance Wavelength ◽  
Refractive Index Sensor ◽  
Crystal Fiber

Abstract A dual-core and dual D-shaped photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor with silver and Aluminum Nitride (AlN) films is designed. The distribution characteristics of the electromagnetic fields of core and plasmon modes, as well as the sensing properties are numerically studied by finite element method (FEM). The structure parameters of the designed sensor are optimized by the optical loss spectrum. The results show the resonance wavelength variation of 489 nm for the refractive index (RI) range of 1.36~1.42. In addition, a maximum wavelength sensitivity of 13400 nm/RIU with the corresponding RI resolution of 7.46×10-6 RIU is obtained in the RI range of 1.41~1.42. The proposed sensor with the merits of high sensitivity, low cost and simple structure has a wide application in the fields of RI sensing, such as hazardous gas detection, environmental monitoring and biochemical analysis.

scholarly journals Assessing the parameters modulating optical losses of iron oxide nanoparticles under near infrared irradiation

2021 ◽  
Author(s):  
Claudia Lozano-Pedraza ◽  
Elena Plaza-Mayoral ◽  
Ana Espinosa ◽  
Begoña Sot ◽  
Aida Serrano ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Near Infrared ◽  
Optical Loss ◽  
Oxide Nanoparticles ◽  
Infrared Irradiation ◽  
Optical Losses

Heating mediated by iron oxide nanoparticles subjected to near infrared irradiation has recently gained lots of interest. The high optical loss values reported in combination with the optical technologies already...

scholarly journals Dependence of optical attenuation on radiation wavelength and waveguide geometry in copper-coated optical fibers

2020 ◽  
Vol 238 ◽  
pp. 11013
Author(s):  
Pavel Cherpak ◽  
Renat Shaidullin ◽  
Oleg Ryabushkin
Keyword(s):  
Optical Fibers ◽  
Near Infrared ◽  
Optical Loss ◽  
Single Mode ◽  
Optical Losses ◽  
Radiation Losses ◽  
Optical Attenuation ◽  
Novel Approach ◽  
Laser Sources

We demonstrate a novel approach to the determination of optical loss coefficients in metal-coated fibers in a 0.4-1.9 μm wavelength range. It is based on measuring the change of temperature-dependent electrical resistance of the metal coating caused by laser radiation transmitted through the fiber. A number of single-mode and multimode metallized fibers were investigated using several laser sources operating in visible and near infrared ranges. The spectral dependencies of optical losses of copper-coated fibers were experimentally obtained. The region that corresponds to the minimum optical losses is located near 1 μm wavelength. The increase of radiation losses in 1.5-1.9 μm region is much steeper compared to polymer-coated fibers.

Sign in / Sign up

Export Citation Format

Share Document