scholarly journals Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2698
Author(s):  
Nurperi Yavuz ◽  
Mustafa Mert Bayer ◽  
Hüseyin Ozan Ҫirkinoğlu ◽  
Ali Serpengüzel ◽  
Thien Le Phu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Polarized Light ◽  
Tunable Laser ◽  
Infrared Region ◽  
Nitrogen Vacancy ◽  
Quality Factors ◽  
High Quality ◽  
Near Surface ◽  
Optical Applications ◽  
Bulk Diamond

An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

Highly luminescent InP-In(Zn)P/ZnSe/ZnS core/shell/shell colloidal quantum dots with tunable emission synthesized based on growth-doping

2021 ◽  
Author(s):  
Cong Shen ◽  
Yan Qing Zhu ◽  
Zixiao Li ◽  
Jingling Li ◽  
Hong Tao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Infrared Region ◽  
Colloidal Quantum Dots ◽  
High Quality ◽  
Promising Alternative ◽  
Lower Toxicity ◽  
Near Infrared Region ◽  
Inp Quantum Dots ◽  
Tunable Emission

InP quantum dots (QDs) are considered as the most promising alternative to Cd-based QDs with the lower toxicity and emission spectrum tunability ranging from visible to near-infrared region. Although high-quality...

Surface Plasmon Resonance with Electrospun Nanofibers on Gold Surface

2009 ◽  
Vol 1173 ◽  
Author(s):  
Kazuma Tsuboi ◽  
Hidetoshi Matsumoto ◽  
Mie Minagawa ◽  
Akihiko Tanioka
Keyword(s):  
Surface Plasmon ◽  
Near Infrared ◽  
Polarized Light ◽  
Electrospun Nanofibers ◽  
Gold Surface ◽  
Infrared Region ◽  
Peak Wavelength ◽  
Absorption Bands ◽  
Propagation Length ◽  
Near Infrared Region

AbstractIn this paper we report new excitation method of surface plasmon polariton (SPP) at air/gold interface with electrospun nanofibers. Nanofibers of polyvinylpirrolidone were electrospun onto the surface of a gold film. The observations by scanning electron microscopy and optical microscopy indicated that the average diameters of the nanofibers were about 300 nm and average sizes of pores were about 30-40 μm. Optical response of the nanofibers on gold surface was investigated by polarized reflection absorption spectroscopy (RAS). The RAS spectrum with p-polarized light showed two absorption bands while the spectrum with s-polarized light only one band. One is a band at about 520 nm that also found in the spectrum with s-polarized light. Another is a broad band in the near-infrared region which found only with p-polarized light. The peak intensity of the latter band increases with increase of incident angle of the polarized light and the peak wavelength of the band shifted to longer wavelength. These responses suggested that SPP at air/gold interface was excited with the scattering light from the electrospun nanofibers. We also found that the peak wavelength of the absorption band in near-infrared region changed with the increase of the amount of the nanofibers. This may be due to the fact that the sizes of the pores on gold surface became smaller than the propagation length of SPP, which resulted in scattering and interference of SPP.

scholarly journals Experimental verification of asymmetric transmission in continuous omega-shaped metamaterials

RSC Advances ◽  
2018 ◽  
Vol 8 (67) ◽  
pp. 38556-38561 ◽  
Author(s):  
Ying-Hua Wang ◽  
Inki Kim ◽  
Ren-Chao Jin ◽  
Heonyeong Jeong ◽  
Jia-Qi Li ◽  
...  
Keyword(s):  
Experimental Verification ◽  
Near Infrared ◽  
Polarized Light ◽  
Infrared Region ◽  
Asymmetric Transmission ◽  
Linearly Polarized ◽  
Near Infrared Region

A bi-layer continuous omega-shaped metamaterial was proposed and fabricated to measure the asymmetric transmission (AT) effect of a linearly polarized light at near-infrared region.

scholarly journals High-Performance Asymmetric Optical Transmission Based on a Dielectric–Metal Metasurface

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2410
Author(s):  
Wenbing Liu ◽  
Lirong Huang ◽  
Jifei Ding ◽  
Chenkai Xie ◽  
Yi Luo ◽  
...  
Keyword(s):  
High Performance ◽  
Optical Transmission ◽  
Near Infrared ◽  
Contrast Ratio ◽  
Polarized Light ◽  
Infrared Region ◽  
Optical Systems ◽  
Asymmetric Transmission ◽  
Linearly Polarized ◽  
Transmittance Peak

Asymmetric optical transmission plays a key role in many optical systems. In this work, we propose and numerically demonstrate a dielectric–metal metasurface that can achieve high-performance asymmetric transmission for linearly polarized light in the near-infrared region. Most notably, it supports a forward transmittance peak (with a transmittance of 0.70) and a backward transmittance dip (with a transmittance of 0.07) at the same wavelength of 922 nm, which significantly enhances operation bandwidth and the contrast ratio between forward and backward transmittances. Mechanism analyses reveal that the forward transmittance peak is caused by the unidirectional excitation of surface plasmon polaritons and the first Kerker condition, whereas the backward transmittance dip is due to reflection from the metal film and a strong toroidal dipole response. Our work provides an alternative and simple way to obtain high-performance asymmetric transmission devices.

Freeform Extrusion Fabrication of Advanced Ceramic Components With Embedded Sapphire Optical Fiber Sensors

2016 ◽  
Author(s):  
Amir Ghazanfari ◽  
Wenbin Li ◽  
Ming C. Leu ◽  
Jeremy Watts ◽  
Yiyang Zhuang ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Near Infrared ◽  
Tunable Laser ◽  
Infrared Region ◽  
Fabrication Process ◽  
Laser Source ◽  
Layer By Layer ◽  
Fiber Sensors ◽  
Sensor Reading ◽  
Ceramic Components

Traditionally, sensors to be integrated into a structural component are attached to or mounted on the component after the component has been fabricated. This tends to result in unsecured sensor attachment and/or serious offset between the sensor reading and the actual status of the structure, leading to performance degradation of the host structure. This paper describes a novel extrusion-based additive manufacturing process that has been developed to enable embedment of sensors in ceramic components during the part fabrication. In this process, an aqueous paste of ceramic particles with a very low amount of binder content (< 1 vol%) is extruded through a moving nozzle to build the part layer-by-layer. In the case of sensor embedment, the fabrication process is halted after a certain number of layers have been deposited. The sensors are placed in their predetermined locations, and the remaining layers are deposited until the part fabrication is completed. Because the sensors are embedded during the fabrication process, they are fully integrated with the part and the aforementioned problems of traditional sensor embedment can be eliminated. The sensors used in this study were made of sapphire optical fibers of 125 and 250 micro-meters diameter and can withstand temperatures up to 1600 °C. After the parts were built, two different drying processes (freeze drying and humid drying) were investigated to dry the parts. The dried parts were then sintered to achieve near theoretical density. Scanning electron microscopy was used to observe the embedded sensors and to detect any possible flaws in the part or embedded sensor. Attenuation of the sensors was measured in near-infrared region (1500–1600 nm wavelength) with a tunable laser source. Raman spectroscopy was performed on the samples to measure the residual stresses caused by shrinkage of the part and its slippage on the fibers during sintering and mismatch between the coefficients of thermal expansion of the fiber and host material. Standard test methods were employed to examine the effect of embedded fibers on the strength and hardness of the parts. The result indicated that the sapphire fiber sensors with diameters smaller than 250 micrometers are able to endure the freeform extrusion fabrication process and also the post-processing without compromising the part properties.

THE EFFECT OF HYDROGEN CHLORIDE ON THE NEAR-INFRARED SPECTRUM OF NYLON

1961 ◽  
Vol 39 (12) ◽  
pp. 2394-2399 ◽  
Author(s):  
P. Larose
Keyword(s):  
Infrared Spectrum ◽  
Hydrogen Chloride ◽  
Near Infrared ◽  
Polarized Light ◽  
Infrared Region ◽  
Peptide Linkage ◽  
Near Infrared Region ◽  
Made In ◽  
Near Infrared Spectrum

Samples of oriented nylon film and filament were treated with anhydrous HCl and examined in the near-infrared region of 9000 to 3700 cm−1 with polarized light. The results are in agreement with previous observations made in the 3600–600 cm−1 region, and corroborate earlier evidence that HCl interacts with the peptide linkage. The disorienting effect of the HCl is also reflected in the spectrum of the treated specimens.

scholarly journals All-polymer whispering gallery mode sensor for application in optofluidics

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Ann Britt Petermann ◽  
Bernhard Roth ◽  
Uwe Morgner ◽  
Merve Meinhardt-Wollweber
Keyword(s):  
Optical Sensors ◽  
Tunable Laser ◽  
High Sensitivity ◽  
Aqueous Environment ◽  
Quality Factors ◽  
High Quality ◽  
Whispering Gallery ◽  
Narrow Line Width ◽  
Resonance Shift ◽  
Laser Systems

AbstractMicrocavities such as spheres or rings are resonant optical sensors which support whispering gallery modes (WGMs). In recent years WGM based sensors have been continuously improved with respect to sensitivity and detection limit. The conventional method to measure physical as well as biological quantities using WGMs is to record the resonance shift of a single resonator. To ensure high sensitivity, resonators with high quality factors, expensive ultra narrow-line width tunable laser systems, and piezoelectric positioning are necessary. All these requirements hamper operation beyond the laboratory environment. To overcome these limitations in previous work we presented a small and completely polymer based measurement system. We use an array of microspheres with slightly different diameters, taking advantage of the fact that every single microsphere has a different resonance behaviour. Using many spheres instead of a single one relieves the high demands on resonator quality and allows using inexpensive polymer spheres instead of high quality resonators. Here we show, that a fixation of the spheres makes the device more robust with the result that the sensor is well suited for the determination of an unknown wavelength under different environmental conditions, for example in aqueous environment. This offers the possibility to use the sensor in microfluidics in the future.

scholarly journals Unveiling radial breathing mode in a particle-on-mirror plasmonic nanocavity

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Qifa Wang ◽  
Chenyang Li ◽  
Liping Hou ◽  
Hanmou Zhang ◽  
Xuetao Gan ◽  
...  
Keyword(s):  
Local Field ◽  
Near Infrared ◽  
Polarized Light ◽  
Field Enhancement ◽  
Radial Breathing Mode ◽  
Infrared Region ◽  
The Other ◽  
Optical Measurements ◽  
Dark Mode ◽  
Breathing Mode

Abstract Plasmonic radial breathing mode (RBM), featured with radially oscillating charge density, arises from the surface plasmon waves confined in the flat nanoparticles. The zero net dipole moment endows the RBM with an extremely low radiation yet a remarkable intense local field. On the other hand, owing to the dark mode nature, the RBMs routinely escape from the optical measurements, severely preventing their applications in optoelectronics and nanophotonics. Here, we experimentally demonstrate the existence of RBM in a hexagonal Au nanoplate-on-mirror nanocavity using a far-field linear-polarized light source. The polarization-resolved scattering measurements cooperated with the full-wave simulations elucidate that the RBM originates from the standing plasmon waves residing in the Au nanoplate. Further numerical analysis shows the RBM possesses the remarkable capability of local field enhancement over the other dark modes in the same nanocavity. Moreover, the RBM is sensitive to the gap and nanoplate size of the nanocavity, providing a straightforward way to tailor the wavelength of RBM from the visible to near-infrared region. Our approach provides a facile optical path to access to the plasmonic RBMs and may open up a new route to explore the intriguing applications of RBM, including surface-enhanced Raman scattering, enhanced nonlinear effects, nanolasers, biological and chemical sensing.

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