We study the ionization dynamics of Ar clusters exposed to ultrashort near-infrared (NIR) laser pulses for intensities well below the threshold at which tunnel ionization ignites nanoplasma formation. We find that the emission of highly charged ions up to Ar^{8+} can be switched on with unit contrast by generating only a few seed electrons with an ultrashort extreme-ultraviolet (XUV) pulse prio...

Multiphoton excitation microscopy is becoming increasingly important as it offers several advantages over confocal laser (single photon excitation) scanning microscopy (CLSM) such as use of lesser damaging NIR wavelengths, reduced scattering, deeper imaging, no need for pinhole, higher light collection efficiency and excitation of UV dyes at NIR wavelengths; in addition, excitation and photoble...

Mid-infrared (MIR) sideband generation on a near infrared (NIR) optical carrier is demonstrated within a quantum cascade laser (QCL). By employing an externally injected NIR beam, E(NIR), that is resonant with the interband transitions of the quantum wells in the QCL, the nonlinear susceptibility is enhanced, leading to both frequency mixing and sideband generation. A GaAs-based MIR QCL (E(QCL)...

Introduction: Depression is a common psychiatric disorder and about one in five people experience depression during their lifespan. Despite the anti-depressive effects of drug therapy, problems such as non-targeting and dose-resistant lead to more effective approaches. Transcranial Photobiomodulation (TPBM) or transcranial low-level laser (TLLL) therapy is a novel and neuropro...

Graphene oxide (GO) has been extensively explored in nanomedicine for its excellent physiochemical, electrical, and optical properties. Here, polyethylene glycol (PEG) and polyethylenimine (PEI) are covalently conjugated to GO via amide bonds, obtaining a physiologically stable dual-polymer-functionalized nano-GO conjugate (NGO-PEG-PEI) with ultra-small size. Compared with free PEI and the GO-P...

The present paper reports the near infrared (NIR) emission spectra of Er: Yb co-doped SiO2-Al2O3-TiO2 sol-gel glasses. Upon optical pumping either with 980nm(Diode Laser) or 488nm (Ar ion laser), the NIR emission transition (I13/2→I15/2) at 1550nm of (Er:Yb) glasses have revealed an improved intensity by many times compared with the Er singly doped sol-gel glass. The dependence of the emission ...

The search for efficient plasmonic photothermal therapies using nonharmful pulse laser irradiation at the near-infrared (NIR) is fundamental for biomedical cancer research. Therefore, the development of novel assembled plasmonic gold nanostructures with the aim of reducing the applied laser power density to a minimum through hot-spot-mediated cell photothermolysis is an ongoing challenge. We de...

Multifunctional nanoplatforms with integrated diagnostic and therapeutic functions have attracted tremendous attention. Especially, the second near-infrared (NIR-II) light response-based nanoplatforms hold great potential in cancer theranostic applications, which is because the NIR-II window provides larger tissue penetration depth and higher maximum permissible exposure (MPE) than that of the ...

Nanoshells are useful in near-infrared (NIR) applications because of the red shift of the Mie resonance into NIR. Silica/gold/silver nanoshells were prepared via gold anchoring and characterized by Mie-theoretical calculations and transmission electron microscopy, which indicated a broad and enhanced NIR absorption and a partially coated, mottled Ag/Au structure on the silica core. The mottled ...

The photo-thermal therapy using nano-materials has attracted great attention as an efficient strategy for the next generation of cancer treatments. Recently, photo-thermal therapy based on nano-materials that can be activated by a skin-penetrating NIR (Near Infra Red) irradiation has been suggested as a noninvasive, harmless, and highly efficient therapeutic technique. Graphene nano-layers synt...