Abstract:Scanning Near-field Optical Microscopy (SNOM) has been successful in finely tuning the optical properties of photonic crystal (PC) nanocavities. The SNOM nanoprobes proposed so far allowed for either redshifting or blueshifting the resonance peak of the PC structures. In this paper, we theoretically demonstrate the possibility of a redshifting (up to +0.65 nm) and a blueshifting (up to −5 nm) the PC cavity resonance wavelength with a single perturbation element. As an example, a fiber bowtie-aperture nano-ante… Show more
“…At first glance, assuming pure magnetic (electric) dipolar resonance of the DA (triangle), the magnetic polarizability of the DA seems to recover the value of the electric polarizability of the triangle because the F z / ECS ratio is almost the same (4.5 × 10 −9 ) for the two NP s at their respective resonance. Further investigations, such as the study of the coupling between these particles with another resonant system (photonic crystal for example 23 ), can be done to determine the electric and magnetic contributions to the resonance properties of such NP s. Figure 3 Calculated longitudinal forces exerted by an x –polarized ( a ) and y –polarized ( b ) plane wave illuminating the DA at normal incidence. ( c ) Shows the energy flow distribution (in color map) passing through the middle of the DA in a vertical xOz plane in the case of x –polarization.…”
Section: Proposed Geometry and Radiation Pressurementioning
In this paper, we propose and numerically simulate a novel optical trapping process based on the enhancement and the confinement of both magnetic and electric near-fields by using gold Diabolo Antenna (DA). The later was recently proposed to generate huge magnetic near-field when illuminated by linearly polarized wave along its axis. Numerical 3D – FDTD simulation results demonstrate the high confinement of the electromagnetic field in the vicinity of the DA. This enhancement is then exploited for the trapping of nano-particles (NP) as small as 30 nm radius. Results show that the trapping process greatly depends on the particle dimensions and that three different regimes of, trapping at contact, trapping without contact, or pushing can be achieved within the same DA. This doubly resonant structure opens the way to the design of a novel generation of efficient optical nano-tweezers that allow manipulation of nano-particles by simply changing the operation wavelength.
“…At first glance, assuming pure magnetic (electric) dipolar resonance of the DA (triangle), the magnetic polarizability of the DA seems to recover the value of the electric polarizability of the triangle because the F z / ECS ratio is almost the same (4.5 × 10 −9 ) for the two NP s at their respective resonance. Further investigations, such as the study of the coupling between these particles with another resonant system (photonic crystal for example 23 ), can be done to determine the electric and magnetic contributions to the resonance properties of such NP s. Figure 3 Calculated longitudinal forces exerted by an x –polarized ( a ) and y –polarized ( b ) plane wave illuminating the DA at normal incidence. ( c ) Shows the energy flow distribution (in color map) passing through the middle of the DA in a vertical xOz plane in the case of x –polarization.…”
Section: Proposed Geometry and Radiation Pressurementioning
In this paper, we propose and numerically simulate a novel optical trapping process based on the enhancement and the confinement of both magnetic and electric near-fields by using gold Diabolo Antenna (DA). The later was recently proposed to generate huge magnetic near-field when illuminated by linearly polarized wave along its axis. Numerical 3D – FDTD simulation results demonstrate the high confinement of the electromagnetic field in the vicinity of the DA. This enhancement is then exploited for the trapping of nano-particles (NP) as small as 30 nm radius. Results show that the trapping process greatly depends on the particle dimensions and that three different regimes of, trapping at contact, trapping without contact, or pushing can be achieved within the same DA. This doubly resonant structure opens the way to the design of a novel generation of efficient optical nano-tweezers that allow manipulation of nano-particles by simply changing the operation wavelength.
“…The magnetic field of light is often considered to be a negligible contributor to the light–matter interaction. However, with the advent of left-handed metamaterials 1 – 4 , nanophotonics has recently been used to investigate the magnetic response in nanostructures to reveal the hidden magnetic part of the light–matter interaction, e.g., to achieve negative refractive indices 4 , control magnetic transitions in matter 5 – 7 , map optical magnetic fields 8 – 13 , and study magnetic effects at optical frequencies 14 – 16 . In this study, we show that the magnetic field of light also has the desirable ability to control light coupling into optical surface waves.…”
We study the directional excitation of optical surface waves controlled by the magnetic field of light. We theoretically predict that a spinning magnetic dipole develops a tunable unidirectional coupling of light to transverse electric (TE) polarized Bloch surface waves (BSWs). Experimentally, we show that the helicity of light projected onto a subwavelength groove milled into the top layer of a 1D photonic crystal (PC) controls the power distribution between two TE-polarized BSWs excited on both sides of the groove. Such a phenomenon is shown to be solely mediated by the helicity of the magnetic optical field, thus revealing a magnetic spin-orbit interaction of light. Remarkably, this magnetic optical effect is clearly observed via a near-field coupler governed by an electric dipole moment: it is of the same order of magnitude as the electric optical effects involved in the coupling. This opens up new degrees of freedom for the manipulation of light and offers desirable and novel opportunities for the development of integrated optical functionalities.
“…The magnetic field of light is often considered to be a negligible contributor to light-matter interaction. However, with the advent of the left-handed metamaterials [1][2][3][4] , nanophotonics has recently investigated magnetic response in nanostructures to reveal the hidden magnetic part of the light-matter interaction, e.g., to achieve negative refractive indices 4 , to control magnetic transitions in matter [5][6][7] , to map optical magnetic fields [8][9][10][11][12][13] and to study magnetic effects at optical frequencies [14][15][16] . In this paper, we show that the magnetic field of light has also the appealing ability to control the light coupling into optical surface waves.…”
We study the directional excitation of optical surface waves controlled by the magnetic field of light. We theoretically predict that a spinning magnetic dipole develops a tunable unidirectional coupling of light to TE-polarized Bloch surface waves (BSWs). Experimentally, we show that the helicity of light projected onto a subwavelength groove milled in the top layer of a 1D photonic crystal (PC) controls the power distribution between two TE-polarized BSWs excited on both sides of the groove. Such a phenomenon is shown to be mediated solely by the helicity of the magnetic field of light, thus revealing a magnetic spin-orbit interaction. Remarkably, this magnetic optical effect is clearly observed with a near-field coupler governed by an electric dipole moment: it is of the same order of magnitude as the electric optical effects involved in the coupling. It opens new degrees of freedom in the manipulation of light and offers appealing novel opportunities in the development of integrated optical functionalities.
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