Enhancing Magnetic Light Emission with All-Dielectric Optical Nanoantennas

Sanz‐Paz, Maria; Ernandes, Cyrine; Esparza, Juan Uriel; Burr, Geoffrey W.; Hulst, Niek F. van; Maître, Agnès; Aigouy, Lionel; Gacoin, Thierry; Bonod, Nicolas; García-Parajo, María F.; Bidault, Sébastien; Mivelle, Mathieu

doi:10.1021/acs.nanolett.8b00548

Cited by 78 publications

(65 citation statements)

References 53 publications

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“…A similar comparison can be performed between the genetically optimized antenna and other commonly used dielectric resonators for enhanced magnetic fields such as a single silicon disk or a dimer of Si disks (see Figure S5, Supporting Information). Importantly, the magnetic field intensity enhancements simulated here for a disk dimer and a hollow nanodisk are in good agreement with recently reported experimental values, validating the relevance of the comparison made here. These simulations indicate that the GA design offers a very significant enhancement of the magnetic field intensity above the antenna that is 10× and 8× larger than for a single disk or a dimer, respectively.…”

Section: Resultssupporting

confidence: 91%

“…Hollow nanodisks (i.e., nanocylinders) were proposed to overcome this hurdle, granting access to the magnetic field that would be partially enhanced in air and not entirely in the dielectric material. We recently used this approach to experimentally couple such structures to magnetic emitters, demonstrating the manipulation of the magnetic local density of states . However, it is still very challenging to place a nanoscale piece of material inside hollow nanodisks, making nanostructures featuring easily accessible magnetic hotspots particularly appealing.…”

Section: Introductionmentioning

confidence: 99%

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Evolutionary Optimization of All‐Dielectric Magnetic Nanoantennas

Bonod

Bidault

Burr

et al. 2019

Advanced Optical Materials

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Magnetic light and matter interactions are generally too weak to be detected, studied, and applied technologically. However, if one can increase the magnetic power density of light by several orders of magnitude, the coupling between magnetic light and matter could become of the same order of magnitude as the coupling with its electric counterpart. For that purpose, photonic nanoantennas, in particular dielectric, are proposed to engineer strong local magnetic field and therefore increase the probability of magnetic interactions. Unfortunately, dielectric designs suffer from physical limitations that confine the magnetic hot spot in the core of the material itself, preventing experimental and technological implementations. Here, it is demonstrated that evolutionary algorithms can overcome such limitations by designing new dielectric photonic nanoantennas, able to increase and extract the optical magnetic field from high refractive index materials. It is also demonstrated that the magnetic power density in an evolutionary optimized dielectric nanostructure can be increased by a factor 5 compared to state‐of‐the‐art dielectric nanoantennas and that the fine details of the nanostructure are not critical in reaching these aforementioned features, as long as the general shape of the motif is maintained. This advocates for the feasibility of nanofabricating the optimized antennas experimentally and their subsequent application.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Evolutionary Optimization of All‐Dielectric Magnetic Nanoantennas

Bonod

Bidault

Burr

et al. 2019

Advanced Optical Materials

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“…The contrasts of electric and/or magnetic LDOS close to dielectric nanostructures are in agreement with recently published experimental results, showing a clear separation of electric and magnetic LDOS above the dielectric structures. 24,46 Also the quantitative trends in the intensity ratios are correctly recovered by the simulations, showing an enhancement of the luminescence intensity by a factor of around 3 for the MD transition and 1.5 in the ED case.…”

Section: Discussionmentioning

confidence: 60%

“…21 Lanthanoid ions (also known as rare earth elements) such as europium (Eu 3+ ) exhibit ED and MD transitions of similar strength 22 and can be used as probes of the optical magnetic near field. 23,24 A peculiarity of Eu 3+ is that electric and magnetic dipole transitions of comparable strength occur at close wavelengths. ED and MD transitions of Eu 3+ both start from the 5 D 0 energy level via de-excitation to the 7 F 2 (ED) and the 7 F 1 level (MD).…”

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confidence: 99%

Enhancement of electric and magnetic dipole transition of rare-earth-doped thin films tailored by high-index dielectric nanostructures

et al. 2019

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We propose a simple experimental technique to separately map the emission from electric and magnetic dipole transitions close to single dielectric nanostructures, using a few nanometer thin film of rare-earth ion doped clusters. Rare-earth ions provide electric and magnetic dipole transitions of similar magnitude. By recording the photoluminescence from the deposited layer excited by a focused laser beam, we are able to simultaneously map the electric and magnetic emission enhancement on individual nanostructures. In spite of being a diffraction-limited far-field method with a spatial resolution of a few hundred nanometers, our approach appeals by its simplicity and high signal-to-noise ratio. We demonstrate our technique at the example of single silicon nanorods and dimers, in which we find a significant separation of electric and magnetic near-field contributions. Our method paves the way towards the efficient and rapid characterization of the electric and magnetic optical response of complex photonic nanostructures.In the last decades, photonic nanostructures emerged as powerful instruments to control light at the subwavelength scale. 1 The interest in nano-optics lies usually in the control of the optical electric field, since the response of materials to rapidly oscillating magnetic fields is extremely weak. Actually, materials with a substantial magnetic response to electromagnetic radiation (i.e. µ = 1) are not known in nature. However, properly designed nanostructures allow to significantly boost the magnetic response. For instance metallic (split-)ring resonators support a magnetic moment which is proportional to the area covered by the ring's aperture. For frequencies in the visible range this area is usually about 10 6 times larger than the equivalent area in atoms, defined by the Bohr radius, which explains the emergence of observable effects related to the optical magnetic field. 2 In consequence, it is possible to overcome the natural limitation to µ = 1 by designing so-called meta-materials, which are ordered arrangements of meta-units like splitring resonators. 3 Using metals requires nanostructures of complex shape to obtain a significant magnetic response. On the other hand, in dielectrics of high refractive index, a magnetic response arises naturally from the curl of the electric field. 4,5 Very simple geometries like spheres 6 or cylinders 7 are actually sufficient to induce a strong magnetic field enhancement. 8 An additional advantage of high-index dielectric nanostructures is their low dissipation. Silicon (Si) for example has a very low absorption through the entire visible range compared to noble metals. 9 This weak absorption associated to the indirect gap in the near infrared becomes cumbersome only for applica- * tions involving propagation of visible light across distances of tens to hundreds of microns. Thus, in submicron dielectric nano-structures the absorption can usually be neglected. 10 In summary, high-index nanostructures seem to provide an appropriate platform to study the co...

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“…21,29 In particular, we previously demonstrated that by changing the distance between a nanoparticle containing electric and magnetic dipolar transitions and a gold strip of micrometer size, we could engineer their respective electric and magnetic emission, 29 in the same way it was predicted and demonstrated by K. H Drexhage 30 and Chance et al 14 This approach Nevertheless, in order to go further in the engineering of the interactions between magnetic light and matter, it is necessary to design nanostructures allowing to boost these interactions. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] Along those lines, we recently demonstrated for the first time how dielectric nanoantennas were able to enhance the magnetic emission of quantum emitters 34 and researchers have demonstrated, through assemble measurements, that metallic nanostructured films could promote the transmission of magnetic emission. 26 But so far, only theoretical works have studied and demonstrated the ability of single plasmonic nanostructures [35][36][37][38] to manipulate the spontaneous emission of MD transitions by manipulating the magnetic LDOS at the nanoscale.…”

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confidence: 99%

Exploring the Magnetic and Electric Side of Light through Plasmonic Nanocavities

et al. 2018

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Light-matter interactions are often considered to be mediated by the electric component of light only, neglecting the magnetic contribution. However, the electromagnetic energy density is equally distributed between both parts of the optical fields. Within this scope, we experimentally demonstrate here, in excellent agreement with numerical simulations, that plasmonic nanostructures can selectively manipulate and tune the magnetic versus electric emission of luminescent nanocrystals. In particular, we show selective enhancement or decay of magnetic and electric emission from trivalent europium-doped nanoparticles in the vicinity of plasmonic nanocavities, designed to efficiently couple to either the electric or magnetic emission of the quantum emitter. Specifically, by precisely controlling the spatial position of the emitter with respect to our plasmonic nanostructures, by means of a near-field optical microscope, we record local distributions of both magnetic and electric radiative local densities of states (LDOS) with nanoscale precision. The distribution of the radiative LDOS reveals the modification of both the magnetic and electric optical quantum environments induced by the presence of the metallic nanocavities. This manipulation and enhancement of magnetic light-matter interaction by means of plasmonic nanostructures opens up new possibilities for the research fields of optoelectronics, chiral optics, nonlinear and nano-optics, spintronics, and metamaterials, among others.

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Enhancing Magnetic Light Emission with All-Dielectric Optical Nanoantennas

Cited by 78 publications

References 53 publications

Evolutionary Optimization of All‐Dielectric Magnetic Nanoantennas

Evolutionary Optimization of All‐Dielectric Magnetic Nanoantennas

Enhancement of electric and magnetic dipole transition of rare-earth-doped thin films tailored by high-index dielectric nanostructures

Exploring the Magnetic and Electric Side of Light through Plasmonic Nanocavities

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