scholarly journals Silicon-Based Multilayer Waveguides for Integrated Photonic Devices from the Near to Mid Infrared

2021 ◽  
Vol 11 (3) ◽  
pp. 1227
Author(s):  
Iñaki López García ◽  
Mario Siciliani de Cumis ◽  
Davide Mazzotti ◽  
Iacopo Galli ◽  
Pablo Cancio Pastor ◽  
...  
Keyword(s):  
Photonic Devices ◽  
Visible Range ◽  
Experimental Characterization ◽  
Mid Infrared ◽  
Wide Range ◽  
Infrared Spectral ◽  
Silicon Based ◽  
Optical Behavior ◽  
532 Nm

Advancements in spectroscopy, quantum optics, communication, and sensing require new classes of integrated photonic devices to host a wide range of non-linear optical processes involving wavelengths from the visible to the infrared. In this framework, waveguide (WG) structures designed with innovative geometry and materials can play a key role. We report both finite element modeling and experimental characterization of silicon nitride multilayer WGs from the visible to the mid-infrared spectral regions. The simulations evaluated optical behavior and mechanical stress as a function of number of WG layers and photonic structure dimensions. WGs were optimized for waveguiding at 1550 nm and 2640 nm. Experimental characterization focused on optical behavior and coupling losses from 532 nm to 2640 nm. Measured losses in WGs indicate a quasi-perfect waveguiding behavior in the IR range (with losses below 6 dB), with a relevant increase (up to 20 dB) in the visible range.

Silicon photonic devices for mid-infrared applications

Nanophotonics ◽  
2014 ◽  
Vol 3 (4-5) ◽  
pp. 329-341 ◽  
Author(s):  
Raji Shankar ◽  
Marko Lončar
Keyword(s):  
Gas Sensing ◽  
Wavelength Region ◽  
Photonic Devices ◽  
Ring Resonators ◽  
Space Communications ◽  
Mid Infrared ◽  
Silicon Photonic ◽  
Processing Techniques ◽  
Silicon Based

AbstractThe mid-infrared (IR) wavelength region (2–20 µm) is of great interest for a number of applications, including trace gas sensing, thermal imaging, and free-space communications. Recently, there has been significant progress in developing a mid-IR photonics platform in Si, which is highly transparent in the mid-IR, due to the ease of fabrication and CMOS compatibility provided by the Si platform. Here, we discuss our group’s recent contributions to the field of silicon-based mid-IR photonics, including photonic crystal cavities in a Si membrane platform and grating-coupled high-quality factor ring resonators in a silicon-on-sapphire (SOS) platform. Since experimental characterization of microphotonic devices is especially challenging at the mid-IR, we also review our mid-IR characterization techniques in some detail. Additionally, pre- and post-processing techniques for improving device performance, such as resist reflow, Piranha clean/HF dip cycling, and annealing are discussed.

scholarly journals A CMOS Compatible Pyroelectric Mid-Infrared Detector Based on Aluminium Nitride

Sensors ◽  
2019 ◽  
Vol 19 (11) ◽  
pp. 2513 ◽  
Author(s):  
Christian Ranacher ◽  
Cristina Consani ◽  
Andreas Tortschanoff ◽  
Lukas Rauter ◽  
Dominik Holzmann ◽  
...  
Keyword(s):  
Infrared Detector ◽  
Aluminium Nitride ◽  
Co2 Absorption ◽  
Absorption Region ◽  
Mid Infrared ◽  
Infrared Spectral Range ◽  
Wide Range ◽  
Infrared Spectral ◽  
Pyroelectric Material ◽  
Cmos Compatible

The detection of infrared radiation is of great interest for a wide range of applications, such as absorption sensing in the infrared spectral range. In this work, we present a CMOS compatible pyroelectric detector which was devised as a mid-infrared detector, comprising aluminium nitride (AlN) as the pyroelectric material and fabricated using semiconductor mass fabrication processes. To ensure thermal decoupling of the detector, the detectors are realized on a Si3N4/SiO2 membrane. The detectors have been tested at a wavelength close to the CO2 absorption region in the mid-infrared. Devices with various detector and membrane sizes were fabricated and the influence of these dimensions on the performance was investigated. The noise equivalent power of the first demonstrator devices connected to a readout circuit was measured to be as low as 5.3 × 10 − 9 W / Hz .

New Approaches of Nanocomposite Materials for Electromagnetic Sensors and Robotics

2013 ◽  
pp. 57-73
Author(s):  
Alessandro Massaro ◽  
Fabrizio Spano ◽  
Diego Caratelli ◽  
Alexander Yarovoy ◽  
Roberto Cingolani ◽  
...  
Keyword(s):  
Nanocomposite Materials ◽  
Experimental Characterization ◽  
Electromagnetic Sensors ◽  
Nano Scale ◽  
Wide Range ◽  
Novel Devices ◽  
And Robotics ◽  
Numerical Approaches ◽  
Nano Antennas

In this paper, the authors define new classes of devices based on nanocomposite materials (NMs). The work introduces approaches about the design and the experimental characterization of these materials. A wide range of applications is presented by discussing novel devices implemented by nanocomposite techniques including sensing and robotic in micro/nano scale. The approaches are oriented on the electromagnetic (EM) characterization of tailored devices such as sensors, and micro/nano antennas. New EM numerical approaches for the design are presented.

scholarly journals Experimental Characterization of Friction in a Negative Stiffness Nonlinear Oscillator

Vibration ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 132-148
Author(s):  
Dario Anastasio ◽  
Stefano Marchesiello
Keyword(s):  
Dynamical Behavior ◽  
Harmonic Balance Method ◽  
Nonlinear Behavior ◽  
Nonlinear Damping ◽  
Negative Stiffness ◽  
Experimental Characterization ◽  
Restoring Force ◽  
Wide Range ◽  
Energy Dissipated

Nonlinear dissipative phenomena are common features of many dynamical systems and engineering applications, and their experimental characterization has always been a challenge among the research community. Within the wide range of nonlinear damping mechanisms, friction is surely one of the most common, and with a high impact on the dynamical behavior of structures. In this paper, the nonlinear identification of friction in a negative stiffness oscillator is pursued. The structure exhibits a strong nonlinear behavior, mainly due to its polynomial elastic restoring force with a negative stiffness region. This leads to an asymmetric double-well potential with two stable equilibrium positions, and the possibility of switching between them in a chaotic way. Friction plays a crucial role in this context, as it derives from the continuous sliding between the central guide and the moving mass. The system is driven through harmonic tests with several input amplitudes, in order to estimate the variations in the energy dissipated per cycle. The identification of the frictional behavior is then pursed by minimizing the errors between the experimental measurements and the model predictions, using the harmonic balance method in conjunction with a continuation technique on the forcing amplitudes.

Spectroscopic characterization of Ho3+ doped PbWO4 crystals for laser and stimulated Raman scattering applications in the mid-infrared spectral range

2008 ◽  
Vol 31 (1) ◽  
pp. 94-101 ◽  
Author(s):  
Ilya S. Mirov ◽  
Vladimir V. Fedorov ◽  
Igor S. Moskalev ◽  
Dmitri V. Martyshkin ◽  
Sergey Yu. Beloglovski ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Spectral Range ◽  
Stimulated Raman Scattering ◽  
Spectroscopic Characterization ◽  
Mid Infrared ◽  
Infrared Spectral Range ◽  
Infrared Spectral ◽  
Stimulated Raman

scholarly journals Experimental Characterization of Pantograph Arcs and Transient Conducted Phenomena in DC Railways

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 10 ◽  
Author(s):  
Andrea Mariscotti ◽  
Domenico Giordano
Keyword(s):  
Transportation Systems ◽  
Electric Arc ◽  
Electrical Characteristics ◽  
Experimental Characterization ◽  
Transient Event ◽  
Current Collection ◽  
Spectral Signatures ◽  
Wide Range ◽  
Quality Measurements

<p class="Abstract">An electric arc is an example of a transient event that is quite common in electrified transportation systems as by-product of the current collection mechanism. As a broadband transient, an electric arc excites a wide range of (often oscillatory) responses related to the substation and onboard filters, as well as the line resonances and anti-resonances. Similarly do the charging of onboard filter and other related inrush events. This work considers the electrical characteristics of these transients and of the excited responses in order to define their typical spectral signatures in DC railways and take them into account concerning their impact on Power Quality measurements and the measurements of instruments deployed onboard.</p>

Experimental Characterization of Contact Hysteresis at High Temperatures

2006 ◽  
Author(s):  
Sergio Filippi ◽  
Esequiel B. Rodrigues ◽  
Muzio M. Gola
Keyword(s):  
Friction Coefficient ◽  
Experimental Determination ◽  
Measurement System ◽  
Experimental Characterization ◽  
Test Rig ◽  
Tangential Load ◽  
Wide Range ◽  
Induction System

The current paper presents a measurement system for the experimental determination of contact hysteresis cycles at temperatures up to 800° C. A test rig was designed to conduct experiments in a wide range of temperatures, with different combinations of normal and tangential load, frequencies and contacting materials. An induction system supplies the heat for measurements of hysteresis cycles at the required temperatures. Measurements show the dependence of the friction coefficient on temperature.

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