Fluorescent chemo-sensors based on “dually smart” optical micro/nano-waveguides lithographically fabricated with AIE composite resins

2020 ◽  
Vol 7 (7) ◽  
pp. 1782-1789 ◽  
Author(s):  
Meng-Dan Qian ◽  
Yun-Lu Sun ◽  
Zhi-Yong Hu ◽  
Xiao-Feng Fang ◽  
Jin-Long Zhu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Direct Detection ◽  
Composite Resins ◽  
Two Photon ◽  
On Chip

Single/two-photon-lithographically fabricated “smart” active micro/nano-optics are composed of covalently co-crosslinked SU-8/AIEoxe for the on-chip-integratable direct detection of various VOCs in aqueous solution.

scholarly journals On-chip microwave photonic beamformer circuits operating with phase modulation and direct detection

2014 ◽  
Vol 22 (14) ◽  
pp. 17079 ◽  
Author(s):  
Leimeng Zhuang ◽  
Marcel Hoekman ◽  
Caterina Taddei ◽  
Arne Leinse ◽  
René G. Heideman ◽  
...  
Keyword(s):  
Phase Modulation ◽  
Direct Detection ◽  
Microwave Photonic ◽  
On Chip

Local Environment of Surface-Polyelectrolyte-Bound DNA Oligomers

2000 ◽  
Vol 651 ◽  
Author(s):  
Sangmin Jeon ◽  
Sung Chul Bae ◽  
Jiang John Zhao ◽  
Steve Granick
Keyword(s):  
Aqueous Solution ◽  
Salt Concentration ◽  
Fluorescence Anisotropy ◽  
Local Environment ◽  
Time Resolved Fluorescence ◽  
Surface Complexes ◽  
Dna Oligomers ◽  
Time Resolved ◽  
Two Photon ◽  
Anisotropy Decay

AbstractTwo-photon time-resolved fluorescence anisotropy methods were used to study the dynamical environment when fluorescent-labelled DNA oligomers (labelled with FAM, 6-fluorescein-6-carboxamido hexanoate) formed surface complexes with quaternized polyvinylpyridine (QPVP) cationic layers on a glass surface. We compared the anisotropy decay of DNA in bulk aqueous solution, DNA adsorbed onto QPVP, and QPVP-DNA-QPVP sandwich structures. When DNA was adsorbed onto QPVP, its anisotropy decay was dramatically retarded compared to the bulk, which means it had very slow rotational motion on the surface. Motions slowed down with increasing salt concentration up to a level of 0.1 M NaCl, but mobility began to increase at still higher salt concentration owing to detachment from the surface-immobilizing QPVP layers.

A reusable ratiometric two-photon chemodosimeter for Hg2+ detection based on ESIPT and its application in bioimaging

2015 ◽  
Vol 3 (17) ◽  
pp. 3459-3464 ◽  
Author(s):  
Weifang Luo ◽  
Huie Jiang ◽  
Kaiming Zhang ◽  
Wei Liu ◽  
Xiaoliang Tang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Two Photon

A novel reaction-based recyclable two-photon chemodosimeter for Hg2+ detection in nearly aqueous solution was developed, which could be used for bioimaging.

scholarly journals Two-photon exchange in leptophilic dark matter scenarios

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Raghuveer Garani ◽  
Federico Gasparotto ◽  
Pierpaolo Mastrolia ◽  
Henrik J. Munch ◽  
Sergio Palomares-Ruiz ◽  
...  
Keyword(s):  
Dark Matter ◽  
Momentum Transfer ◽  
Direct Detection ◽  
Form Factors ◽  
Scalar Particle ◽  
Analytical Form ◽  
Photon Exchange ◽  
Two Photon ◽  
Zero Momentum ◽  
Pseudo Scalar

Abstract In leptophilic scenarios, dark matter interactions with nuclei, relevant for direct detection experiments and for the capture by celestial objects, could only occur via loop-induced processes. If the mediator is a scalar or pseudo-scalar particle, which only couples to leptons, the dominant contribution to dark matter-nucleus scattering would take place via two-photon exchange with a lepton triangle loop. The corresponding diagrams have been estimated in the literature under different approximations. Here, we present new analytical calculations for one-body two-loop and two-body one-loop interactions. The two-loop form factors are presented in closed analytical form in terms of generalized polylogarithms up to weight four. In both cases, we consider the exact dependence on all the involved scales, and study the dependence on the momentum transfer. We show that some previous approximations fail to correctly predict the scattering cross section by several orders of magnitude. Moreover, we quantitatively show that form factors in the range of momentum transfer relevant for local galactic dark matter, can be significantly smaller than their value at zero momentum transfer, which is the approach usually considered.

Two-Photon-Absorption Technique for Selective Detection of Copper(II) Ions in Aqueous Solution Using a Dansyl-Pyrene Conjugate

2011 ◽  
Vol 6 (9) ◽  
pp. 2246-2250 ◽  
Author(s):  
Vadapalli Chandrasekhar ◽  
Mrituanjay D. Pandey ◽  
Sandeep Kumar Maurya ◽  
Pratik Sen ◽  
Debabrata Goswami
Keyword(s):  
Aqueous Solution ◽  
Photon Absorption ◽  
Selective Detection ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Absorption Technique
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