scholarly journals Mie-driven directional nanocoupler for Bloch surface wave photonic platform

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Dmitry N. Gulkin ◽  
Anna A. Popkova ◽  
Boris I. Afinogenov ◽  
Daniil A. Shilkin ◽  
Kęstutis Kuršelis ◽  
...  
Keyword(s):  
Close Packing ◽  
Low Loss ◽  
Optical Components ◽  
Central Wavelength ◽  
One Dimensional ◽  
Optical Resonances ◽  
On Demand ◽  
Semiconductor Nanoparticle ◽  
Proper Design ◽  
Bloch Surface Wave

Abstract Modern integrated photonic platforms should combine low-loss guiding, spectral flexibility, high light confinement, and close packing of optical components. One of the prominent platforms represents a one-dimensional photonic crystal combined with dielectric nanostructures that manipulate low-loss Bloch surface waves (BSWs). Proper design of nanostructures gives rise to a variety of optical resonances suitable for efficient capturing and controlling light. In this work, we achieve color-selective directional excitation of BSWs mediated by Mie resonances in a semiconductor nanoparticle. We show that a single silicon nanoparticle can be used as a subwavelength multiplexer switching the BSW excitation direction from forward to backward within the 30 nm spectral range with its central wavelength governed by the nanoparticle size. Our work opens a route for the on-demand fabrication of photonic nanocouplers with tailored optical properties and submicron footprint.

Evaluation of AMB Turbomachinery Auxiliary Bearings

1999 ◽  
Vol 121 (2) ◽  
pp. 156-161 ◽  
Author(s):  
R. G. Kirk
Keyword(s):  
Transient Response ◽  
Analytical Techniques ◽  
Contact Forces ◽  
Active Magnetic Bearings ◽  
Low Loss ◽  
The Past ◽  
Compressor Rotor ◽  
Auxiliary Bearing ◽  
On Line ◽  
Proper Design

The use of active magnetic bearings (AMB) for turbomachinery has experienced substantial growth during the past two decades. The advantages for many applications make AMB’s a very attractive solution for potentially low loss and efficient support for both radial and thrust loads. New machinery must be shop tested prior to shipment to the field for installation on-line. For AMB turbomachinery, one additional test is the operation of the auxiliary drop or overload bearings. A major concern is ability of the selected auxiliary bearing to withstand the contact forces following an at speed rotor drop. The proper design of AMB machinery requires the calculation of the anticipated loading for the auxiliary bearings. Analytical techniques to predict the rotor transient response are reviewed. Results of transient response evaluation of a full-size compressor rotor are presented to illustrate some of the important parameters in the design for rotor drop.

scholarly journals Bloch surface wave-coupled emission from quantum dots by ensemble and single molecule spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (67) ◽  
pp. 54403-54411 ◽  
Author(s):  
Krishanu Ray ◽  
Ramachandram Badugu ◽  
Joseph R. Lakowicz
Keyword(s):  
Quantum Dots ◽  
Photonic Crystal ◽  
Surface Wave ◽  
Single Molecule ◽  
Single Molecule Spectroscopy ◽  
One Dimensional ◽  
Fluorescence Studies ◽  
Emission Lifetime ◽  
Crystal Substrate ◽  
Bloch Surface Wave

Single particle fluorescence studies demonstrate increased brightness and reduced emission lifetime of individual QD575 on one-dimensional photonic crystal substrate.

Low-loss one-dimensional photonic bandgap filter in (110) silicon

2006 ◽  
Vol 31 (3) ◽  
pp. 395 ◽  
Author(s):  
Ariel Lipson ◽  
Eric M. Yeatman
Keyword(s):  
Photonic Bandgap ◽  
Low Loss ◽  
One Dimensional

scholarly journals Characterisation and potential for reducing optical resonances in FTIR spectrometers of the Network for the Detection of Atmospheric Composition Change (NDACC)

2020 ◽  
Author(s):  
Thomas Blumenstock ◽  
Frank Hase ◽  
Axel Keens ◽  
Denis Czurlok ◽  
Orfeo Colebatch ◽  
...  
Keyword(s):  
Beam Splitter ◽  
Background Level ◽  
Air Gap ◽  
Atmospheric Composition ◽  
Composition Change ◽  
Infrared Source ◽  
Optical Components ◽  
Optical Resonances ◽  
Ftir Spectrometer

Abstract. Although optical components in Fourier transform infrared (FTIR) spectrometers are preferably wedged, in practice, infrared spectra typically suffer from the effects of optical resonances (“channeling”) affecting the retrieval of weakly absorbing gases. This study investigates the level of channeling of each FTIR spectrometer within the Network for the Detection of Atmospheric Composition Change (NDACC). Dedicated spectra were recorded by more than twenty NDACC FTIR spectrometers using a laboratory mid-infrared source and two detectors. In the InSb detector domain (1900–5000 cm−1), we find that the amplitude of the most pronounced channeling frequency amounts to 0.1 to 2.0 ‰ of the spectral background level, with a mean of (0.68 ± 0.48) ‰ and a median of 0.60 ‰. In the HgCdTe detector domain (700–1300 cm−1), we find even stronger effects, with the largest amplitude ranging from 0.3 to 21 ‰ with a mean of (2.45 ± 4.50) ‰ and a median of 1.2 ‰. For both detectors, the leading channeling frequencies are 0.9 and 0.11 or 0.23 cm−1 in most spectrometers. These observed spectral frequencies correspond to the optical thickness of the air gap in between the beam splitter and compensator plate (0.9 cm−1) and the beam splitter substrate itself (0.11 and 0.23 cm−1). Since the air gap is a significant source of channeling and the corresponding amplitude differs strongly between spectrometers, we propose new beam splitters with the wedge of the air gap increased to at least 0.8°. We tested the insertion of spacers in a beam splitter’s air gap to demonstrate that increasing the wedge of the air gap decreases the 0.9 cm−1 channeling amplitude significantly. This study shows the potential for reducing channeling in the FTIR spectrometers operated by the NDACC, thereby increasing the quality of recorded spectra across the network.

scholarly journals High-Q two-groove resonator for all-dielectric Bloch surface wave platform

2021 ◽  
Vol 2015 (1) ◽  
pp. 012016
Author(s):  
E A Bezus ◽  
E A Kadomina ◽  
D A Bykov ◽  
A A Morozov ◽  
L L Doskolovich
Keyword(s):  
Surface Wave ◽  
Optical Computing ◽  
Photonic Devices ◽  
Resonant Structure ◽  
Optical Filtering ◽  
One Dimensional ◽  
High Q ◽  
At Resonance ◽  
Central Ridge ◽  
Bloch Surface Wave

Abstract We propose a simple integrated resonant structure for the Bloch surface wave platform, which consists of two subwavelength grooves patterned on the surface of a one-dimensional dielectric photonic crystal. We demonstrate that the investigated structure can operate in a parasitic-scattering-free regime and, in this case, provide unity transmittance and zero reflectance at resonance conditions associated with the excitation of a leaky mode of the structure localized at the central ridge formed by the grooves. The proposed structure may find application in integrated photonic devices for optical filtering and analog optical computing.

scholarly journals Directional luminescence of the diamond NV center via Bloch surface waves in one-dimensional photonic crystals

2021 ◽  
Vol 2015 (1) ◽  
pp. 012022
Author(s):  
A A Bragina ◽  
K R Safronov ◽  
V O Bessonov ◽  
A A Fedyanin
Keyword(s):  
Angular Distribution ◽  
Photonic Crystal ◽  
Surface Wave ◽  
Photonic Crystals ◽  
Surface Waves ◽  
Coupling Efficiency ◽  
One Dimensional ◽  
Close Proximity ◽  
Nv Center ◽  
Bloch Surface Wave

Abstract In this work, we numerically study the luminescence of nanodiamonds with NV centres embedded in a polymer layer on the surface of one-dimensional photonic crystal. The interaction of NV center spontaneous emission with the Bloch surface wave (BSW) is demonstrated. The presence of a photonic crystal leads to a change in the angular distribution of the emitter radiation due to the coupling of luminescence to BSW. We show that the best coupling efficiency of 71% is observed when NV centres are located in the close proximity to the BSW field maximum.

Optical resonances in one-dimensional dielectric nanorod arrays: field-induced fluorescence enhancement

2007 ◽  
Vol 32 (18) ◽  
pp. 2762 ◽  
Author(s):  
Marine Laroche ◽  
Silvia Albaladejo ◽  
Rémi Carminati ◽  
Juan José Sáenz
Keyword(s):  
Fluorescence Enhancement ◽  
Nanorod Arrays ◽  
One Dimensional ◽  
Optical Resonances

Metal oxide patterns of one-dimensional nanofibers: on-demand, direct-write fabrication, and application as a novel platform for gas detection

2019 ◽  
Vol 7 (43) ◽  
pp. 24919-24928 ◽  
Author(s):  
Kyeorei Lim ◽  
Young-Moo Jo ◽  
Ji-Wook Yoon ◽  
Jong-Heun Lee
Keyword(s):  
Metal Oxide ◽  
Formation Mechanism ◽  
Near Field ◽  
Gas Detection ◽  
Direct Write ◽  
One Dimensional ◽  
On Demand ◽  
Potential Applications

On-demand, direct-write fabrication of metal oxide patterns composed of one-dimensional nanofibers using near-field electrospinning is demonstrated and their formation mechanism as well as potential applications are investigated.

An agglutinate magnetic spray transforms inanimate objects into millirobots for biomedical applications

2020 ◽  
Vol 5 (48) ◽  
pp. eabc8191
Author(s):  
Xiong Yang ◽  
Wanfeng Shang ◽  
Haojian Lu ◽  
Yanting Liu ◽  
Liu Yang ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Magnetic Film ◽  
Diverse Range ◽  
One Dimensional ◽  
3D Objects ◽  
Confined Spaces ◽  
On Demand ◽  
Minimalist Approach ◽  
Catheter Navigation ◽  
Original Size

Millirobots that can adapt to unstructured environments, operate in confined spaces, and interact with a diverse range of objects would be desirable for exploration and biomedical applications. The continued development of millirobots, however, requires simple and scalable fabrication techniques. Here, we propose a minimalist approach to construct millirobots by coating inanimate objects with a composited agglutinate magnetic spray. Our approach enables a variety of one-dimensional (1D), 2D, or 3D objects to be covered with a thin magnetically drivable film (~100 to 250 micrometers in thickness). The film is thin enough to preserve the original size, morphology, and structure of the objects while providing actuation of up to hundreds of times its own weight. Under the actuation of a magnetic field, our millirobots are able to demonstrate a range of locomotive abilities: crawling, walking, and rolling. Moreover, we can reprogram and disintegrate the magnetic film on our millirobots on demand. We leverage these abilities to demonstrate biomedical applications, including catheter navigation and drug delivery.

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