Remarkable polarization sensitivity of gold nanoparticle arrays

Canfield, Brian K.; Kujala, Sami; Kauranen, Martti; Jefimovs, Konstantins; Vallius, Tuomas; Turunen, Jari

doi:10.1063/1.1924886

Cited by 58 publications

(41 citation statements)

References 14 publications

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“…Using these parameters in conjunction with the analytical expressions for the rearranged constituents as derived below, the optical response of the modified metaatoms can be predicted. The first investigated structure is the L -metaatom 43,44 . In this geometry one of the SRR arms is omitted in order to prevent the cancelation of the far-field that originated from the antiparallel dipole moments.…”

Section: The L -Metaatommentioning

confidence: 99%

Simple and versatile analytical approach for planar metamaterials

et al. 2010

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We present an analytical model which permits the calculation of effective material parameters for planar metamaterials consisting of arbitrary unit cells (metaatoms) formed by a set of straight wire sections of potentially different shape. The model takes advantage of resonant electric dipole oscillations in the wires and their mutual coupling. The pertinent form of the metaatom determines the actual coupling features. This procedure represents a kind of building block model for quite different metaatoms. Based on the parameters describing the individual dipole oscillations and their mutual coupling the entire effective metamaterial tensor can be determined. By knowing these parameters for a certain metaatom it can be systematically modified to create the desired features. Performing such modifications effective material properties as well as the far field intensities remain predictable. As an example the model is applied to reveal the occurrence of optical activity if the split ring resonator metaatom is modified to L-or S-shaped metaatoms.

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Section: The L -Metaatommentioning

confidence: 99%

Simple and versatile analytical approach for planar metamaterials

et al. 2010

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“…A conventional approach to studying arrays of nanoobjects deals with optical reflectivity [20,21] or nonlinear-optical conversion [22][23][24], allowing us to find such interesting phenomena as coherent control of optical transmission [25], enhancement of the up-conversion luminescence intensity [26], and periodicity-induced pulse splitting [27]. On the other hand, much less attention is drawn towards polarization effects which are capable of revealing the dynamics of the optical anisotropy induced by a fs laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser-induced optical anisotropy in a two-dimensional lattice of magnetic dots

et al. 2014

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Using pump-probe optical polarimetry we demonstrate that femtosecond laser excitation of a 2D regular lattice of magnetic nanodots effectively changes the optical anisotropy of the array. Study of the dynamics of the femtosecond laser-induced anisotropy reveals four main mechanisms occurring in the electronic, spin, and lattice subsystems. Below 1 ps, a strong Kerr-like nonlinearity causes linear birefringence, with its axis directed along the electric field of the linearly polarized femtosecond laser pump pulse. In addition, a long-living linear birefringence is also induced due to slowly relaxing excitations. Also below 1 ps, ultrafast laser-induced demagnetization of Co leads to a partial breakdown of the circular birefringence of the magnetic nanodots. On the timescale up to 300 ps, optically triggered acoustic modes of the dots drive oscillations of the linear optical birefringence. During this process, the oscillations damp while transferring their energy into acoustic modes of the substrate. On the nanosecond timescale, the signal is dominated by acoustic oscillations at the surface of the substrate.

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“…A wide range of even planar chiral plasmonic metamaterials have shown giant chiral interplay with circularly polarized light despite they are not truly chiral. [19][20][21][22][23][24] As a matter of fact, planar chiral metamaterials in the form of a 2D gammadions array have generated superchiral electromagnetic fields offering a strong interaction with chiral materials consisting of biomacromolecules for ultrasensitive characterization. [7] However, as also recently demonstrated by the enhanced chiral optical response of 3D plasmonic nanostructures, [25][26][27][28][29][30][31][32][33][34][35][36][37] chirality is an intrinsic property of 3D objects and, in particular, among the possible 3D chiral shapes, lacking of mirror symmetry, the helical configuration has exhibited large chiral response in the far field.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

Materials and 3D Designs of Helix Nanostructures for Chirality at Optical Frequencies

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et al. 2017

Advanced Optical Materials

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The capability to fully control the chiro‐optical properties of metamaterials has drawn considerable attention due to developments in metamaterial fabrication techniques and a deeper understanding of the light–matter interaction, enabling a number of applications from integrated photonics to life sciences. From simple geometrical studies on single helix shaped metamaterials, both the design complexity and nanofabrication capability are steadily increasing allowing to extend their properties to the visible regime and beyond. In this work, helix‐shaped micro‐ and nanostructures are reviewed, which have the possibility to modulate their optical response in the linear regime at optical frequencies by spatial arrangement or by constitutive material. An overview of different theories describing the general optical operation of chiral media and a discussion on experimental results obtained by the state‐of‐the‐art helix structures realized by different fabrication techniques is provided. Finally, advanced designs for improved functionality envisaged to match practical applications or to enable new optical multifunctionalities are compared. Even if many applications have been envisaged only theoretically, the continuous effort and progress shown by the research community engaged in this field suggests that helical chiral metamaterials could represent a disruptive breakthrough for advanced optical devices.

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Remarkable polarization sensitivity of gold nanoparticle arrays

Cited by 58 publications

References 14 publications

Simple and versatile analytical approach for planar metamaterials

Simple and versatile analytical approach for planar metamaterials

Femtosecond laser-induced optical anisotropy in a two-dimensional lattice of magnetic dots

Materials and 3D Designs of Helix Nanostructures for Chirality at Optical Frequencies

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