Nonlinear optical properties of Au/Ag alloyed nanoboxes and their applications in both in vitro and in vivo bioimaging under long-wavelength femtosecond laser excitation

RSC Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2851-2856 ◽  
Author(s):  
Kanghui Li ◽  
Yalun Wang ◽  
Fuhong Cai ◽  
Jiaxin Yu ◽  
Shaowei Wang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Laser Excitation ◽  
Nonlinear Optical Properties ◽  
Localized Surface Plasmon ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Long Wavelength

We synthesize Au/Ag alloyed nanoboxes (ANBs) with different LSPR (localized surface plasmon resonance) peak wavelengths and observe their various nonlinear optical properties.

Nonlinear properties of silver nanoparticles explored by a femtosecond Z-scan technique

2015 ◽  
Vol 55 (2) ◽  
Author(s):  
Aleksandr Alesenkov ◽  
Jurgis Pilipavičius ◽  
Aldona Beganskienė ◽  
Romualdas Sirutkaitis ◽  
Valdas Sirutkaitis
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Surface Plasmon Resonance Peak ◽  
Nanoparticle Suspension ◽  
Plasmon Resonance Peak ◽  
Wide Range

In this report we present results of linear and nonlinear optical properties of colloidal material consisting of triangle silver nanoparticles in distilled water. The nonlinear optical properties of the material were investigated by a Z-scan technique using femtosecond laser pulses with tunable wavelength. Nanoparticle suspension showed distinct spectra with absorption lines, emerging due to the plasmonic properties of the silver nanoparticles. Surface plasmon resonance peak change over a wide range of wavelengths from 400 to almost 1100 nm was observed when the size of silver nanoparticles varied from 20 to 150 nm. In the samples different nonlinear effects such as saturable absorption, two photon absorption and self-focusing were observed when the femtosecond pulse intensity was changed from 1 up to 100 GW/cm2.

scholarly journals In vitro and in vivo applications of Euphorbia wallichii shoot extract-mediated gold nanospheres

2021 ◽  
Vol 10 (1) ◽  
pp. 101-111
Author(s):  
Rehman Ullah ◽  
Sumaira Shah ◽  
Zahir Muhammad ◽  
Sajjad Ali Shah ◽  
Shah Faisal ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Muscular Contraction ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Optical Absorption Peak ◽  
Visible Spectra ◽  
Scattering Spectra ◽  
Dose Dependent

Abstract The current study was designed to investigate the potential of Euphorbia wallichii shoot extract for reducting Au3+ and stabilizing gold nanoparticles. UV-visible spectra of gold nanoparticles showed obvious surface plasmon resonance peak at 548 nm. Microscopy (SEM and TEM) showed spherical dimensions, and the energy dispersive X-ray spectra displayed the strongest optical absorption peak for gold (Au) at 2.1 keV. Dynamic light scattering spectra represent polydispersed mixture with particulate diameter of 2.5–103.2 nm. The IR spectra confirm the potential functional groups of shoot extract responsible for the reduction of Au3+ to gold nanoparticles which exhibit tremendous antibacterial potential of 76.31%, 68.47%, 79.85%, 48.10%, and 65.53% against Escherichia coli, Staphylococcus aureus, Bacillus pumilus, Pseudomonas aeruginosa, and Klebsiella pneumoniae, respectively. Gold nanoparticles showed markedly elevated fungicidal potency compared to the shoot extract alone against the tested fungal strains. IC50 for 2,2-diphenyl-1-picrylhydrazyl scavenging was 31.52, 18.29, and 15.32 µg/mL at 30, 60, and 90 min of reaction time, respectively. Both shoot extract and nanoparticles revealed 71% mortality at 100 µg/mL, with LD90 values of 310.56 µg/mL. Experimental mice acquired dose-dependent analgesia of 54.21%, 82.60%, and 86.53% when treated with gold nanoparticles at 50, 100, and 200 mg/kg bw. Inhibition of gastrointestinal muscular contraction was 21.16%, 30.49%, and 40.19% in mice feed with 50, 100, and 200 mg/kg bw, respectively.

Nonlinear optical properties of colloidal carbon nanoparticles: nanodiamonds and carbon dots

RSC Advances ◽  
2014 ◽  
Vol 4 (76) ◽  
pp. 40152-40160 ◽  
Author(s):  
Irene Papagiannouli ◽  
Athanasios B. Bourlinos ◽  
Aristides Bakandritsos ◽  
Stelios Couris
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Carbon Nanoparticles ◽  
Nonlinear Optical ◽  
Laser Excitation ◽  
Optical Limiting ◽  
Nonlinear Optical Properties ◽  
Nlo Response ◽  
Colloidal Carbon ◽  
532 Nm

Nanodiamonds (NDs) and carbon-dots (CDs) suspensions exhibit significant NLO response under both ps and ns laser excitation. NDs exhibit important optical limiting action under nanosecond visible (532 nm) and infrared (1064 nm) laser excitation.

Gold Nanorods: From Synthesis to Optical Properties

2014 ◽  
Vol 602-603 ◽  
pp. 993-997
Author(s):  
Gui Jun Ban ◽  
Xiu Li Fu ◽  
Zhi Jian Peng
Keyword(s):  
Optical Properties ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Gold Nanorods ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Excitation Wavelength ◽  
Surface Plasmon Resonance Peak ◽  
Plasmon Resonance Peak ◽  
Aspect Ratios

Gold nanorods with different aspect ratios, exhibiting localized surface plasmon resonance in a tuned longitudinal mode, were prepared by employing a seed mediated growth approach. Their third-order nonlinear optical properties were investigated by using femtosecond Z-scan technique at 800 nm. All the prepared gold nanorods with different aspect ratios exhibited a reverse saturation absorbance behavior, and the value of effective nonlinear absorption coefficient reaches its maximum when the longitudinal surface plasmon resonance peak of the gold nanorods located near the excitation wavelength.

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