Silicon wire waveguide TE/TE mode conversion Bragg grating can be used in wavelength add/drop and polarization rotation Bragg diffraction. The device can implement many filtering functionalities required in wavelength division multiplexing optical communications. In this paper we describe TE/TE mode conversion Bragg grating device incorporating resonant cavity section to obtain narrow transmission wavelength peak. Theoretical calculation agreed with measured wavelength response.
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http://dx.doi.org/10.1364/OE.25.016672 | DOI Listing |
ACS Appl Mater Interfaces
February 2023
ILIT RAS-Branch of the FSRC "Crystallography and Photonics", RAS, 140700 Shatura, Moscow Region, Russia.
The phenomenon of phase change transition has been a fascinating research subject over decades due to a possibility of dynamically controlled materials properties, allowing the creation of optical devices with unique features. The present paper unravels the optical characteristics and terahertz (THz) dielectric permittivity of a novel phase change material (PCM), GeTe, prepared by pulsed laser deposition (PLD) and their remarkable contrast in crystalline and amorphous states, in particular, a difference of 7 orders of magnitude in conductivity. The THz spectra were analyzed using the harmonic oscillator and Drude term.
View Article and Find Full Text PDFThe mode-division-multiplexing (MDM) technology has become an alternative solution to further increase the link capacity in optical communication systems. Ultralow loss waveguide crossings for multimode waveguides are requisite in on-chip MDM systems. We propose and demonstrate an ultralow loss silicon multimode waveguide crossing using a combination of fully etched and shallowly etched waveguides in the multimode-interference coupler region to reduce the imbalance for two transverse electric polarized (TE) modes.
View Article and Find Full Text PDFWe propose an on-chip optical narrowband reflector (NBR) based on two cascaded Bragg gratings (BGs). A π phase shifted anti-symmetric Bragg grating (π-PS-ASBG) and a rear uniform Bragg grating (UBG), are in-line connected. The π-PS-ASBG provides a hybrid mode resonance between the even- and odd TE (TE and TE) modes, while the UBG is used as a rear reflector to reflect the TE mode that transmitted from the π-PS-ASBG.
View Article and Find Full Text PDFJ Phys Condens Matter
January 2020
Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China.
Single-crystalline FeTe in marcasite phase with orthorhombic structure was prepared via chemical vapor transport. Cooling FeTe single crystals from room temperature down to [Formula: see text], multiple magnetic phase transitions were observed. Paramagnetic (PM) to antiferromagnetic (AFM) and then to ferromagnetic (FM) occurred at [Formula: see text] and [Formula: see text] for in-plane, [Formula: see text] and [Formula: see text] for out-of-plane, respectively.
View Article and Find Full Text PDFDent Med Probl
November 2019
Department of Conservative Dentistry, Chair of Conservative Dentistry and Endodontics, Faculty of Medicine with the Division of Dentistry, Medical University of Lodz, Poland.
Background: Biodentine® is a bioactive calcium silicate-based material, with better strength parameters, an easier application method and a shorter setting time than mineral trioxide aggregate (MTA). The bond strength between Biodentine and the composite material is essential for the durability of the layered restoration.
Objectives: The objective of this study was to evaluate the bond strength of Biodentine to a resin-based composite at various acid etching times and with different adhesive strategies.
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