System for transmitting the dimensions of refractive-index unit

1975 ◽  
Vol 18 (5) ◽  
pp. 682-684
Author(s):  
V. E. Buslaeva ◽  
E. A. Volkova ◽  
L. V. Nalbandov
Keyword(s):  
Refractive Index ◽  
Refractive Index Unit ◽  
Index Unit

Optical rotation per refractive index unit, or enantiomeric (e) factor, for screening enantioselective catalysts through asymmetric activation or carbohydrates

Chirality ◽  
2000 ◽  
Vol 12 (5-6) ◽  
pp. 544-547 ◽  
Author(s):  
Remy Angelaud ◽  
Yousuke Matsumoto ◽  
Toshinobu Korenaga ◽  
Kenichi Kudo ◽  
Masaaki Senda ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Rotation ◽  
Refractive Index Unit ◽  
Asymmetric Activation ◽  
Enantioselective Catalysts ◽  
Index Unit

Garnets from the Eilat area, southern Israel

1965 ◽  
Vol 35 (270) ◽  
pp. 386-392 ◽  
Author(s):  
Y. Nathan ◽  
A. Katz ◽  
M. Eyal
Keyword(s):  
Refractive Index ◽  
Unit Cell ◽  
Chemical Analyses ◽  
Cell Edge ◽  
Refractive Index Unit ◽  
Index Unit

SummaryGarnets from twenty-eight pegmatites, schists, and gneisses from the crystalline massif of Eilat have been examined. Refractive index, unit-cell edge, MnO and FeO content were determined in 19 samples. Three chemical analyses are given. The garnets fall into two distinct groups, the pegmatite garnets (spessartine-rich, almandine to spessartine) and metamorphic garnets (nearly pure almandine). Garnets occurring in pegmatite-like granitoid veins cutting through the schists are shown to belong to the second (metamorphic) group. The pegmatite garnets again fall into two groups of different spessartine content.

scholarly journals Perancangan dan Simulasi Microring Resonator Optik dengan Variasi Indeks Bias Cladding untuk Aplikasi Sensor Amonia pada Air Tambak

2019 ◽  
Author(s):  
Fahmi Juliansyah ◽  
Gandi Sugandi ◽  
Lilik Hasanah
Keyword(s):  
Water Quality ◽  
Refractive Index ◽  
Ammonia Concentration ◽  
Microring Resonator ◽  
Ammonia Sensor ◽  
Refractive Index Unit ◽  
Waveguide Width ◽  
Ring Radius ◽  
Index Unit ◽  
Higher Sensitivity

Kualitas air merupakan faktor yang sangat penting dalam budidaya perikanan. Salah satu faktor yang mempengaruhi kualitas air adalah konsentrasi amonia. Oleh karena itu dalam budi daya perikanan dibutuhkan sensor amonia untuk memantau konsentrasi amonia. Sensor berbasis optical microring resonator optik (MRRO) telah menarik banyak perhatian karena ukurannya yang sangat kecil dan sensitifitasnya yang lebih tinggi dibandingkan sensor lain. Dalam penelitian ini telah dirancang dan disimulasikan sensor amonia berbasis MRRO dengan jari-jari ring 5 μm, lebar waveguide 0,1 μm dan gap 0,1 μm. Sensor menunjukkan linearitas yang sangat baik dengan sensitifitas sensor sebesar 168,82 nm/RIU (refractive index unit) dan 0,0973 nm/% amonia dalam air, dan batas deteksi 0,1% konsentrasi amonia dalam air.Water quality is a very important factor in aquaculture. One of the factor that determines water quality is ammonia concentration. Therefore, in aquaculture ammonia sensor is needed to monitor ammonia concentration. Optical microring-resonator(OMRR)-based sensors have gained a lot of interest because of it’s small size and higher sensitivity compared to other sensors. In this research, an OMRR-based ammonia sensor with ring radius of 5 μm, waveguide width of 0,1 μm, and gap of 0,1 μm has been designed and simulated. The sensor showing a very good linearity with sensor’s sensitivity of 168,82 nm/RIU (refractive index unit) and 0,0973 nm/% ammonia in the water, and detection limit of 0,1% ammonia on the water.

scholarly journals Design Rule of Mach-Zehnder Interferometer Sensors for Ultra-High Sensitivity

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2640 ◽  
Author(s):  
Yiwei Xie ◽  
Ming Zhang ◽  
Daoxin Dai
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Silicon On Insulator ◽  
Zehnder Interferometer ◽  
Design Rule ◽  
Wavelength Shift ◽  
Shift Measurement ◽  
Refractive Index Unit ◽  
Index Unit ◽  
Mach Zehnder Interferometer

A design rule for a Mach-Zehnder interferometer (MZI) sensor is presented, allowing tunable sensitivity by appropriately choosing the MZI arm lengths according to the formula given in this paper. The present MZI sensor designed by this method can achieve an ultra-high sensitivity, which is much higher than any other traditional MZI sensors. An example is given with silicon-on-insulator (SOI) nanowires and the device sensitivity is as high as 106 nm/refractive-index -unit (or even higher), by choosing the MZI arms appropriately. This makes it possible for one to realize a low-cost optical sensing system with a detection limit as high as 10−6 refractive-index-unit, even when a cheap optical spectrum analyzer with low-resolution (e.g., 1 nm) is used for the wavelength-shift measurement.

scholarly journals A Compact Robust OWLS System for Biosensing of Multiple Samples

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 863
Author(s):  
Mauricio Moreno-Sereno ◽  
Nasser Darwish-Miranda ◽  
Miquel Giménez-Conejo ◽  
Francisco Palacio-Bonet ◽  
Iván Bernat-Ubiaga ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Waveguide ◽  
High Potential ◽  
Refractive Index Unit ◽  
Light Mode ◽  
On Line ◽  
Mode Spectroscopy ◽  
Multiple Samples ◽  
Index Unit

A compact multichannel and portable OWLS (Optical Waveguide Light Mode Spectroscopy) biosensor will be presented. With a sensitivity of 16.3°/RIU (degrees per refractive index unit) it incorporates on-line reference and high potential for further miniaturization.

scholarly journals Simultaneous Measurement of Refractive Index and Flow Rate Using a Co2+-Doped Microfiber

2021 ◽  
Vol 11 (22) ◽  
pp. 10525
Author(s):  
Da Liu ◽  
Ran Gao ◽  
Zhipei Li ◽  
Anle Qi
Keyword(s):  
Refractive Index ◽  
Flow Rate ◽  
Core Mode ◽  
Measurement Sensitivity ◽  
Resonant Modes ◽  
Cladding Mode ◽  
Bragg Grating Sensor ◽  
Maximum Measurement ◽  
Index Unit ◽  
Surrounding Liquid

This paper has proposed and experimentally demonstrated an integrated Co2+-doped microfiber Bragg grating sensor (Co-MFBGS) that can measure the surrounding liquid refractive index (LRI) and liquid flow rate (LFR) simultaneously. The Co-MFBGS provides well-defined resonant modes of core and cladding in the reflection spectrum. By monitoring the wavelength of the cladding mode, the LRI can be measured; meanwhile, by monitoring the wavelength of the core mode caused by the heat exchange, the LFR can be measured. The LRI and LFR can be distinguished by the wavelength separation between cladding mode and core mode. The experimental results show that in aqueous glycerin solution, the maximum measurement sensitivity for LRI detection is −7.85 nm/RIU (refractive index unit), and the LFR sensitivity is −1.93 nm/(μL/s) at a flow rate of 0.21 μL/s.

scholarly journals Etched Fiber Bragg Grating Biosensor Functionalized with Aptamers for Detection of Thrombin

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4298 ◽  
Author(s):  
Aliya Bekmurzayeva ◽  
Kanat Dukenbayev ◽  
Madina Shaimerdenova ◽  
Ildar Bekniyazov ◽  
Takhmina Ayupova ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Chemical Vapor ◽  
Bragg Grating ◽  
Clinical Settings ◽  
Long Period Grating ◽  
Bragg Wavelength ◽  
Sensing System ◽  
Index Unit

A biosensor based on an etched Fiber Bragg Grating (EFBG) for thrombin detection is reported. The sensing system is based on a Fiber Bragg Grating (FBG) with a Bragg wavelength of 1550 nm, wet-etched in hydrofluoric acid (HF) for ~27 min, to achieve sensitivity to a refractive index (RI) of 17.4 nm/RIU (refractive index unit). Subsequently, in order to perform a selective detection of thrombin, the EFBG has been functionalized with silane-coupling agent 3-(aminopropyl)triethoxysilane (APTES) and a cross-linker, glutaraldehyde, for the immobilization of thrombin-binding aptamer. The biosensor has been validated for thrombin detection in concentrations ranging from 10 nM to 80 nM. The proposed sensor presents advantages with respect to other sensor configurations, based on plasmonic resonant tilted FBG or Long Period Grating (LPG), for thrombin detection. Firstly, fabricating an EFBG only requires chemical etching. Moreover, the functionalization method used in this study (silanization) allows the avoidance of complicated and expensive fabrications, such as thin film sputtering or chemical vapor deposition. Due to their characteristics, EFBG sensors are easier to multiplex and can be used in vivo. This opens new possibilities for the detection of thrombin in clinical settings.

scholarly journals Fiber Optic Refractive Index Sensors Based on a Ball Resonator and Optical Backscatter Interrogation

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6199
Author(s):  
Madina Shaimerdenova ◽  
Takhmina Ayupova ◽  
Marzhan Sypabekova ◽  
Daniele Tosi
Keyword(s):  
Refractive Index ◽  
Reflection Spectrum ◽  
Return Loss ◽  
Fiber Optic ◽  
Single Mode ◽  
Wavelength Shift ◽  
Amplitude Change ◽  
Highly Sensitive ◽  
Refractive Index Sensors ◽  
Index Unit

In this work, we introduced fabrication and interrogation of simple and highly sensitive fiber-optic refractive index (RI) sensors based on ball resonators built on the tip of single-mode fibers. The probes have been fabricated through a CO2 fiber splicer, with a fast (~600 s) and repeatable method. The ball resonator acted as a weak interferometer with a return loss below −50 dB and was interrogated with an optical backscatter reflectometer measuring the reflection spectrum. The ball resonators behaved as weak interferometers with a shallow fringe and a spectrum that appeared close to a random signal, and RI sensitivity could be measured either through wavelength shift or amplitude change. In this work, we reported four samples having sensitivity ranges 48.9–403.3 nm/RIU and 256.0–566.2 dB/RIU (RIU = refractive index unit). Ball resonators appeared as a sensitive and robust platform for RI sensing in liquid and can be further functionalized for biosensing.

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