Second harmonic generation in selenium-metal structures

Gerbreders, V.; Sļedevskis, Ē.; Kolbjonoks, Vadims; Teteris, J.; Gulbis, Arnis

doi:10.1016/j.jnoncrysol.2009.04.059

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…As a matter of fact, there have been some investigations about SHG of amorphous films or microcavities, but the origin is ambiguous [15,16,29,30]. Different from the situations in other amorphous structures derived from strain generated at the interface between structures and substrates, we attribute the SHG process from submicron a-Se spheres to the finity of the medium.…”

Section: Resultsmentioning

confidence: 86%

Second harmonic generation from an individual amorphous selenium nanosphere

Yan²,

Wei³

et al. 2016

Nanotechnology

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Among the numerous nonlinear optics effects, second harmonic generation (SHG) is always a hotspot and it is extensively used for optical frequency conversion, biomedical imaging, etc. However, SHG is forbidden in a medium with inversion symmetry under the electric-dipole approximation. Here, we demonstrated SHG from a single amorphous selenium (a-Se) nanosphere under near-infrared femtosecond pulse excitation. It was found that SH spectra are tunable with the size of a-Se nanospheres and the SHG efficiency of a single a-Se sphere with a diameter over 300 nm is estimated at 10(-8). We also established two physical mechanisms of SHG from the amorphous nanospheres. There is an electric-dipole contribution to the second-order nonlinearity in view of the inevitable structural discontinuity at the surface. The discontinuity of the normal component of the electric field strength leads to the quadrupole-type contributions arising from the large electric field gradient. The SHG process can be enhanced by resonance near the fundamental wavelength, giving rise to the detectable second harmonic (SH) spectra of a single a-Se nanosphere (d > 300 nm) or two small a-Se nanospheres (d = 200 nm) aggregated into a dimer, while the single nanosphere with smaller size (d > 300 nm) is undetectable. As an essential trace element for animals, a-Se features unique biological compatibility and has specific properties of optical nonlinearity within the optical window in biological tissue. This discovery makes a-Se nanospheres promising both in nonlinear optics and biomedicine.

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Section: Resultsmentioning

confidence: 86%

Second harmonic generation from an individual amorphous selenium nanosphere

Yan²,

Wei³

et al. 2016

Nanotechnology

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“…Titan-sapphire (Ti:Al2O3) femtosecond laser CHAMELEON ULTRA (180 fsec pulse width, 80 MHz repetition rate, k -690-1040 nm) used in a unified complex with microscope LEICA has allowed measurements of transmitted and reflected light intensity with an opportunity to decompose the reflected signal with respect to its wavelengths (k-scanning) as described in reference [24].…”

Section: Experimental Methodsmentioning

confidence: 99%

Synthesis of Core/Shell CuO-Zno Nanoparticles and Their Second-Harmonic Generation Performance / Kodols/Čaula Cuo-Zno Nanodaļiņu Sintēze Un To Spēja Ģenerēt Otrās Harmonikas Signālu

Tamanis

Sļedevskis

Ogurcovs

et al. 2015

Latvian Journal of Physics and Technical Sciences

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The present paper presents the method for obtaining core/shell CuOZnO nanoparticles and nanocoatings by using a commercially available vacuum coating system. Initially generated Cu-Zn core/shell nanoparticles have been oxidised with a highly reactive atomic oxygen beam. Second-harmonic generation has been observed in the obtained samples. The dependence of second-harmonic intensity on the wavelength of the exciting radiation is shown in the paper.

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“…To develop a novel laser-projection display with microscale pixel patterns for use as full-color luminescence, Se nanowires (NWs) were synthesized as an optically functional nanomaterial and precisely positioned in a highly uniform fashion on a lithographically patterned substrate. Among other nanomaterials, Se NWs were selected as a model material system with a unique and flexible generation of broadband SHG signals as reported earlier . There has been little effort made on this material, although amorphous and crystalline Se thin films could generate broadband SHG signals under a femtosecond pulse excitation at a certain range of wavelengths (∼800–1000 nm), reaching the maximum intensity of the SHG on the highly pure Se thin films, which may be ideal for the general bioimaging source applications. − Our strategy can be one of the most promising candidates as an emerging optoelectrical device because the SHG-based emission wavelengths correspond to the highest visible light region that yields a wide color gamut for superior visual effects and accurate color reproduction (e.g., true color).…”

mentioning

confidence: 99%

Full-Color Laser Displays Based on Optical Second-Harmonic Generation from the Thin Film Arrays of Selenium Nanowires

et al. 2021

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The second-harmonic generation (SHG) phenomenon, which readily supports the characteristic advantages of promising laser-based display systems, brings a new concept to advanced displays. Here, we demonstrate a laser projection display that utilizes the fabrication and design principles in individual micron-scale pixel arrays by depositing colloidal Se nanowires, a nonlinear optical nanomaterial for full-color light emission. Our system reveals the manufacturing process of planar light-emitting elements without the use of complex color segments, and the layout represents a full-color laser display with high-resolution pixels extracted from the combination of a pulsed femtosecond laser scanning process to access the frequency up-conversion technique based on a wavelength-tunable manner. The work presents attractive features for newly emerging multifunctional optical components composed of unique nanomaterials that can be applied for displays, bioimaging, and other optoelectronic devices.

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Second harmonic generation in selenium-metal structures

Cited by 3 publications

References 5 publications

Second harmonic generation from an individual amorphous selenium nanosphere

Second harmonic generation from an individual amorphous selenium nanosphere

Synthesis of Core/Shell CuO-Zno Nanoparticles and Their Second-Harmonic Generation Performance / Kodols/Čaula Cuo-Zno Nanodaļiņu Sintēze Un To Spēja Ģenerēt Otrās Harmonikas Signālu

Full-Color Laser Displays Based on Optical Second-Harmonic Generation from the Thin Film Arrays of Selenium Nanowires

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