Highly-sensitive passive integrated optical spiral-shaped waveguide refractometer

1997 ◽  
Vol 71 (20) ◽  
pp. 2895-2897 ◽  
Author(s):  
G. J. Veldhuis ◽  
P. V. Lambeck
Keyword(s):  
Highly Sensitive ◽  
Integrated Optical

Thin Chitosan Films for Optical Gas Sensors

2014 ◽  
Vol 605 ◽  
pp. 536-539 ◽  
Author(s):  
Alexander Y. Mironenko ◽  
Alexander A. Sergeev ◽  
Sergey Voznesensky ◽  
Svetlana Y. Bratskaya
Keyword(s):  
Gas Sensors ◽  
Optical Sensors ◽  
Linear Response ◽  
Gaseous Ammonia ◽  
Natural Polysaccharide ◽  
Highly Sensitive ◽  
Integrated Optical ◽  
Ammonia Detection ◽  
Chitosan Films ◽  
Highly Sensitive Detection

Here we report on fabrication of integrated-optical sensors for relative humidity and ammonia detection based on natural polysaccharide chitosan. The sensing properties of the fabricated sensor to gaseous ammonia are presented. The sensor exhibits a linear response in the range of 1-300 ppm with the response time less than 1 second. It has been shown that 1 μm-thick chitosan-based waveguide film allows highly sensitive detection of RH level.

Double plasmon induced transparency in disk and nanobars coupled nanosystems and its application to plasmonic resonance sensing

2016 ◽  
Vol 30 (14) ◽  
pp. 1650150
Author(s):  
Fang Chen ◽  
Duanzheng Yao
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Slow Light ◽  
Highly Sensitive ◽  
Integrated Optical ◽  
High Figure ◽  
Induced Transparency ◽  
Optical Circuits ◽  
Coupled Harmonic Oscillator ◽  
Plasmon Induced Transparency

We demonstrate the realization of plasmon induced transparency (PIT) in a nanostructure composed of silver nanobars and a silver nanodisk. The optical properties of the planar metamaterials have been investigated theoretically in the paper. The classical coupled harmonic oscillator model demonstrates the PIT phenomenon in a nanodisk–nanobar system. Additionally, double PIT response is observed when two nanobars are located in proximity to the silver nanodisk. The PIT window wavelength and bandwidths can be efficiently tuned by controlling the geometric parameters such as the lengths of nanobars and the coupling distances between the nanodisk and nanobars. Moreover, the transparency window shows highly sensitive response to the refractive index of the environmental medium. A high figure of merit up to 15.5 of the asymmetrical system for refractive index sensing is achieved. The tunability of the PIT may have potential application on slow light and highly integrated optical circuits.

Highly sensitive integrated optical biosensors

2014 ◽  
Author(s):  
Vanessa Zamora ◽  
Peter Lützow ◽  
Martin Weiland ◽  
Daniel Pergande ◽  
Henning Schröder
Keyword(s):  
Optical Biosensors ◽  
Highly Sensitive ◽  
Integrated Optical

scholarly journals Highly sensitive spectroscopic detection of heme-protein submonolayer films by channel integrated optical waveguide

2007 ◽  
Vol 15 (9) ◽  
pp. 5595 ◽  
Author(s):  
Ismail E. Araci ◽  
Sergio B. Mendes ◽  
Nasuhi Yurt ◽  
Seppo Honkanen ◽  
N. Peyghambarian
Keyword(s):  
Optical Waveguide ◽  
Heme Protein ◽  
Highly Sensitive ◽  
Integrated Optical ◽  
Integrated Optical Waveguide

Integrated Optical Pickup with Highly Sensitive Servo Signal Detection

1992 ◽  
Vol 31 (Part 1, No. 2B) ◽  
pp. 548-550 ◽  
Author(s):  
Kiyoshi Yokomori ◽  
Shunsuke FUJita ◽  
Shigeyoshi Misawa ◽  
Tami Kihara ◽  
Magane Aoki ◽  
...  
Keyword(s):  
Signal Detection ◽  
Optical Pickup ◽  
Highly Sensitive ◽  
Integrated Optical ◽  
Servo Signal

Ovarian Dysfunction in Fetally Irradiated Beagles

1977 ◽  
Vol 35 ◽  
pp. 658-659
Author(s):  
T. M. Seed ◽  
M. H. Sanderson ◽  
D. L. Gutzeit ◽  
T. E. Fritz ◽  
D. V. Tolle ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Low Dose ◽  
Long Term Effects ◽  
Ovarian Dysfunction ◽  
Dose Rates ◽  
Highly Sensitive ◽  
Microscopic Evaluation ◽  
Ovarian Pathology ◽  
Normal Offspring

The developing mammalian fetus is thought to be highly sensitive to ionizing radiation. However, dose, dose-rate relationships are not well established, especially the long term effects of protracted, low-dose exposure. A previous report (1) has indicated that bred beagle bitches exposed to daily doses of 5 to 35 R 60Co gamma rays throughout gestation can produce viable, seemingly normal offspring. Puppies irradiated in utero are distinguishable from controls only by their smaller size, dental abnormalities, and, in adulthood, by their inability to bear young.We report here our preliminary microscopic evaluation of ovarian pathology in young pups continuously irradiated throughout gestation at daily (22 h/day) dose rates of either 0.4, 1.0, 2.5, or 5.0 R/day of gamma rays from an attenuated 60Co source. Pups from non-irradiated bitches served as controls. Experimental animals were evaluated clinically and hematologically (control + 5.0 R/day pups) at regular intervals.

Fluorescence ratio imaging of dynamic intracellular ionic signals

1988 ◽  
Vol 46 ◽  
pp. 42-43
Author(s):  
R. Y. Tsien ◽  
A. Minta ◽  
M. Poenie ◽  
J.P.Y. Kao ◽  
A. Harootunian
Keyword(s):  
Binding Sites ◽  
Living Cells ◽  
Molecular Engineering ◽  
Ph Indicators ◽  
Highly Sensitive ◽  
Fluorescence Ratio Imaging ◽  
Ratio Imaging ◽  
Technical Advances ◽  
Indicator Dyes ◽  
Fluorescein Dyes

Recent technical advances now enable the continuous imaging of important ionic signals inside individual living cells with micron spatial resolution and subsecond time resolution. This methodology relies on the molecular engineering of indicator dyes whose fluorescence is strong and highly sensitive to ions such as Ca2+, H+, or Na+, or Mg2+. The Ca2+ indicators, exemplified by fura-2 and indo-1, derive their high affinity (Kd near 200 nM) and selectivity for Ca2+ to a versatile tetracarboxylate binding site3 modeled on and isosteric with the well known chelator EGTA. The most commonly used pH indicators are fluorescein dyes (such as BCECF) modified to adjust their pKa's and improve their retention inside cells. Na+ indicators are crown ethers with cavity sizes chosen to select Na+ over K+: Mg2+ indicators use tricarboxylate binding sites truncated from those of the Ca2+ chelators, resulting in a more compact arrangement of carboxylates to suit the smaller ion.

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