Abstract:Broadband and anisotropic light emission from rare-earth doped tellurite thin films is demonstrated using Er3+-TeO2 photonic crystals (PhCs). By adjusting the PhC parameters, photoluminescent light can be efficiently coupled into vertical surface emission or lateral waveguide propagation modes. Because of the flexibility of light projection direction, Er3+-TeO2 is a potential broadband light source for integration with three-dimensional photonic circuits and on-chip biochemical sensors.
“…Tellurite glasses (containing TeO 2 as the main component) have attracted much attention for photonic applications due to their high refractive index ( n > 2), large acousto‐optic effect (three times that of quartz), singular nonlinear optical properties (e.g., their Raman coefficients are ~60 times higher than that of silica), and can be tailored by knowledge of structural make‐up, excellent near‐ and mid‐infrared transmittance (from around 400 nm to ~6 μm), large rare‐earth solubility, good chemical durability, and compatibility with fiber drawing processes . Despite their hygroscopic nature which leads to loss when drawn into fibers, they can be made into property‐tailored transparent glass‐ceramics with specialized melting and heat‐treatment protocols .…”
Section: Introductionmentioning
confidence: 99%
“…The superior glass stability of multicomponent tellurites allows them to be prepared as bulk glass by melt quenching, drawn into optical fibers, and even remelted to form microspheres . Planar tellurite thin films, on the other hand, constitute the basic building block for on‐chip photonic devices such as waveguide amplifiers, light emitters, flexible photonic components, and acousto‐optical modulators. Multicomponent tellurite films have been prepared using sol–gel processing and laser ablation .…”
Section: Introductionmentioning
confidence: 99%
“…Alternatively, radio‐frequency (RF) magnetron reactive sputtering has been extensively used for oxide thin film deposition given its great versatility in controlling film stoichiometry, microstructure, and phase composition via tuning deposition parameters, in particular, oxygen partial pressure . Thus far, the method has only been used to grow TeO 2 thin films, Er‐doped single‐component TeO 2 films, and tungsten tellurite materials …”
Multicomponent TeO 2 -Bi 2 O 3 -ZnO (TBZ) glass thin films were prepared using RF magnetron sputtering under different oxygen flow rates. The influences of oxygen flow rate on the structural and optical properties of the resulting thin films were investigated. We observed that thin films sputtered in an oxygen-rich environment are optically transparent while those sputtered in an oxygen-deficient environment exhibit broadband absorption. The structural origin of the optical property variation was studied using X-ray diffraction, X-ray photoelectron spectroscopy, Raman Spectroscopy, and transmission electron microscopy which revealed that the presence of under-coordinated Te leads to the observed optical absorption in oxygen-deficient films.P. Lucas-contributing editor Manuscript No. 35815.
“…Tellurite glasses (containing TeO 2 as the main component) have attracted much attention for photonic applications due to their high refractive index ( n > 2), large acousto‐optic effect (three times that of quartz), singular nonlinear optical properties (e.g., their Raman coefficients are ~60 times higher than that of silica), and can be tailored by knowledge of structural make‐up, excellent near‐ and mid‐infrared transmittance (from around 400 nm to ~6 μm), large rare‐earth solubility, good chemical durability, and compatibility with fiber drawing processes . Despite their hygroscopic nature which leads to loss when drawn into fibers, they can be made into property‐tailored transparent glass‐ceramics with specialized melting and heat‐treatment protocols .…”
Section: Introductionmentioning
confidence: 99%
“…The superior glass stability of multicomponent tellurites allows them to be prepared as bulk glass by melt quenching, drawn into optical fibers, and even remelted to form microspheres . Planar tellurite thin films, on the other hand, constitute the basic building block for on‐chip photonic devices such as waveguide amplifiers, light emitters, flexible photonic components, and acousto‐optical modulators. Multicomponent tellurite films have been prepared using sol–gel processing and laser ablation .…”
Section: Introductionmentioning
confidence: 99%
“…Alternatively, radio‐frequency (RF) magnetron reactive sputtering has been extensively used for oxide thin film deposition given its great versatility in controlling film stoichiometry, microstructure, and phase composition via tuning deposition parameters, in particular, oxygen partial pressure . Thus far, the method has only been used to grow TeO 2 thin films, Er‐doped single‐component TeO 2 films, and tungsten tellurite materials …”
Multicomponent TeO 2 -Bi 2 O 3 -ZnO (TBZ) glass thin films were prepared using RF magnetron sputtering under different oxygen flow rates. The influences of oxygen flow rate on the structural and optical properties of the resulting thin films were investigated. We observed that thin films sputtered in an oxygen-rich environment are optically transparent while those sputtered in an oxygen-deficient environment exhibit broadband absorption. The structural origin of the optical property variation was studied using X-ray diffraction, X-ray photoelectron spectroscopy, Raman Spectroscopy, and transmission electron microscopy which revealed that the presence of under-coordinated Te leads to the observed optical absorption in oxygen-deficient films.P. Lucas-contributing editor Manuscript No. 35815.
“…In addition to the large surface area from the AAO, its nanostructure also alternates the spatial emission mode of the fluorescence, thus increasing the optical signals [38] , [39] . The optical interference caused by the AAO periodic nanostructure introduced an angle-dependent emission profile and strongly improved the fluorescence emission efficiency in the out-of-plane direction [40] , [41] . Fig.…”
An ultra-thin and highly sensitive SARS-CoV-2 detection platform was demonstrated using a nano-porous anodic aluminum oxide (AAO) membrane. The membrane surface was functionalized to enable efficient trapping and identification of SARS-CoV-2 genomic targets through DNA-DNA and DNA-RNA hybridization. To immobilize the probe oligonucleotides on the AAO membrane, the pore surface was first coated with the linking reagents, 3-aminopropyltrimethoxysilane (APTMS) and glutaraldehyde (GA), by a compact vacuum infiltration module. After that, complementary target oligos with fluorescent modifier was pulled and infiltrated into the nano-fluidic channels formed by the AAO pores. The fluorescent signal applying the AAO membrane sensors was two orders stronger than a flat glass template. In addition, the dependence between the nano-pore size and the fluorescent intensity was evaluated. The optimized pore diameter d is 200 nm, which can accommodate the assembled oligonucleotide and aminosilane layers without blocking the AAO nano-fluidic channels. Our DNA functionalized membrane sensor is an accurate and high throughput platform supporting rapid virus tests, which is critical for population-wide diagnostic applications result in a page being rejected by search engines.
“…These cavities act as defects and consequently photons are trapped in [7,8]. Furthermore, manipulating light emission by forming PhC from photoluminescent materials has attracted much attention for biophotonics such as using fluorescence for color controlled protein visualization [9][10][11].…”
The optical properties of BaTiO3 two dimensional photonic crystal (PhC) nanocavities were investigated. Two types of nanocavities consisting of dopants and vacancies with PhC periodicities ranging from 200 to 550 nm were evaluated. The images from laser scanning confocal microscopy show the optical scattering of the PhC cavities is highly wavelength dependent. An optical intensity reversal is observed when the wavelength of probe light shifts by 29 nm. Meanwhile, intensity contrast between the nanocavity and its adjacent PhCs is enhanced as the PhC periodicity becomes shorter than the probe wavelength. To determine the photonic band structures fluorescence from dye covered PhCs were imaged and analyzed. A strong enhancement of fluorescence is observed for the PhC with a period of 200 nm. Upon comparison to the 2D finite difference time domain calculations, the enhancement is attributed to strong light localization within the PhC nanocavity. As a result, the in-plane lightwave propagation is prohibited that results in an increase in the vertical light scattering.
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