Linear dichroism and optical anisotropy of silver nanoprisms in polymer films

Abstract

We present optical studies of two different size distributions of silver triangular nanoprisms, one with a dipole resonance at 520 nm and the other with a dipole resonance at 650 nm, placed in different media. Significant wavelength-dependent depolarization of scattered light from the silver nanoprisms suspended in water indicates strong interference of multiple surface plasmon resonant modes in the same particle. We use this depolarization as a probe of light scattering by the nanoprisms in a lipid solution due to the rejection of a polarized background scattering. Also, the silver nanoprisms were embedded in a polyvinyl alcohol polymer matrix and oriented by stretching the polymer/nanoprism nanocomposite films. We observe significantly increased linear dichroism in the region associated with the plasmonic in-plane dipole mode upon stretching. Additionally, there is a weaker linear dichroism in the region associated with out-of-plane modes, which vanish in the extinction spectrum of the stretched nanocomposite film.

DNA Integration with Silver and Gold Nanoparticles: Enhancement of DNA Optical Anisotropy

“…SPR also provides the optical enhancement, which occasionally led to the emergence of new optical technology . For example, plasmon-enhanced circular dichroism can provide detection of optical activity in a monolayer. − Significantly increased linear dichroism was observed in the oriented by stretching polymer/nanoprism nanocomposite films . NPs are able to increase significantly the optical effects of polymers (and also of biopolymers like DNA) in conjugates. , For example, the significant enhancement of the UV photoresponse in Au NP-embedded salmon DNA thin films was used for the efficient fabrication of photodetectors …”

“…13−15 Significantly increased linear dichroism was observed in the oriented by stretching polymer/nanoprism nanocomposite films. 16 NPs are able to increase significantly the optical effects of polymers (and also of biopolymers like DNA) in conjugates. 17,18 For example, the significant enhancement of the UV photoresponse in Au NP-embedded salmon DNA thin films was used for the efficient fabrication of photodetectors.…”

Лазерно-Индуцированный Линейный Дихроизм В Планарных Самоорганизованных Серебряных Наноструктурах

“…Отклонение формы металлической наночастицы от сферической приводит не только к изменению резонансных частот плазмонных колебаний, но к зависимости спектров поглощения от ориентации частицы относительно поляризации падающего света. В последнее время активно исследуются линейный и круговой дихроизм плазмонных наночастиц и наноструктур [8][9][10]. Актуальность таких исследований связана с созданием метаповерхностей для управления поляризацией света, модуляторов, устройств для хранения данных, шифрования, спектроскопии в поляризованном свете и оптической обработки информации.…”

Laser-induced linear dichroism in planar self-organized silver nanostructures

“…The deviation of the shape of a metal nanoparticle from a spherical one leads not only to a change in the resonant frequencies of plasmon oscillations, but also to a dependence of the absorption spectra on the orientation of the particle with respect to the polarization of the incident light. Recently, the linear and circular dichroism of plasmonic nanoparticles and nanostructures has been actively studied [8][9][10]. The relevance of such research is associated with the creation of metasurfaces for controlling the polarization of light, modulators, data storage devices, encryption, polarized light spectroscopy and optical information processing.…”