Validation of electromagnetic field enhancement in near-infrared through Sierpinski fractal nanoantennas

Çakmakyapan, Semih; Cinel, Neval A.; Cakmak, Atilla Ozgur; Özbay, Ekmel

doi:10.1364/oe.22.019504

Cited by 32 publications

(30 citation statements)

References 40 publications

(40 reference statements)

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“…Various optimization and modification approaches have been proposed with the aim to enhance the properties of the bowtie and diabolo antennas, including the gap optimization [30], fractal geometry [36], or Babinet's principle. Babinet's principle relates the optical response of a (direct) planar antenna and an inverted planar antenna with interchanged conductive and insulating parts.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Hrtoň

Konečná²,

Horák

et al. 2020

Phys. Rev. Applied

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We theoretically study plasmonic antennas featuring areas of extremely concentrated electric or magnetic field, known as hot spots. We combine two types of electric-magnetic complementarity to increase the degree of freedom for the design of the antennas: bowtie and diabolo duality and Babinet's principle. We evaluate the figures of merit for different plasmon-enhanced optical spectroscopy methods and optical trapping: field enhancement, decay rate enhancement, quality factor of the plasmon resonances, and trapping potential depth. The role of Babinet's principle in interchanging electric and magnetic field hot spots and its consequences for practical antenna design are discussed. In particular, diabolo antennas exhibit slightly better performance than bowties in terms of larger field enhancement and larger Q factor. For specific resonance frequency, diabolo antennas are considerably smaller than bowties, which makes them favorable for the integration into more complex devices but also makes their fabrication more demanding in terms of spatial resolution. Finally, we propose a Babinet-type dimer antenna featuring electromagnetic hot spot with both the electric and magnetic field components treated on an equal footing.

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Section: Introductionmentioning

confidence: 99%

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Hrtoň

Konečná²,

Horák

et al. 2020

Phys. Rev. Applied

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“…22 On the other hand, fractal plasmonics is currently receiving the attention of researchers to engineer broadband characteristics of optical devices on a nanoscale because of the self-similarity and precisely defined mathematical model of fractal. Fractal nanostructures have already been exploited for subdiffraction focusing, 23 transparent metallic electrodes, 24 photovoltaic efficiency enhancement, 25 molecular fluorescence and surface-enhanced Raman spectroscopy enhancement, 26,27 broadband light trapping, 28 and, lately, multimodal broadband resonances with degeneracies. 29 Fortunately, the well-known Sierpiński fractal model is perfectly compatible with the state-of-the-art bow-tie nanostructure, and in this work, we particularly attempt to merge the two resourceful design platforms to achieve several specific research goals.…”

Section: Introductionmentioning

confidence: 99%

Realization of Fractal-Inspired Thermoresponsive Quasi-3D Plasmonic Metasurfaces with EOT-Like Transmission for Volumetric and Multispectral Detection in the Mid-IR Region

Hasan

Lee

2016

ACS Omega

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We use a paradigmatic mathematic model known as Sierpiński fractal to reverse-engineer artificial nanostructures that can potentially serve as plasmonic metasurfaces as well as nanogap electrodes. Herein, we particularly demonstrate the possibility of obtaining multispectral extraordinary optical transmission-like transmission peaks from fractal-inspired geometries, which can preserve distinct spatial characteristics. To achieve enhanced volumetric interaction and thermal responsiveness within the framework, we consider a bilayer, quasi-three-dimensional (3D) configuration that relies on the unique approach of combining complementary and noncomplementary surfaces, while avoiding the need for multilayer alignment on the nanoscale. We implement an improved version of the model to (1) increase the volume of quasi-3D nanochannels and enhance the lightening-rod effect of the metasurfaces, (2) harness cross-coupling as a mechanism for achieving better sensitivity, and (3) exploit optical magnetism for pushing the resonances to longer wavelengths on a miniaturized platform. We further demonstrate vertical coupling as an effective route for ultimate miniaturization of such quasi-3D nanostructures. We report a wavelength shift up to 1666 nm/refractive index unit and 2.5 nm/°C, implying the usefulness of the proposed devices for applications such as dielectrophoretic sensing and nanothermodynamic study of molecular reactions in the chemically active mid-IR spectrum.

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“…We have demonstrated an inexpensive and spontaneous route to generate fractal aggregates of metal nanoparticles embedded in a free-standing polymer film, which can serve as efficient SERS substrates at NIR wavelengths. Although SERS enhancement factors greater by up to four orders of magnitude are possible through other fractal Au nanostructures [30,38], these systems are typically fabricated through complex routes such as electron beam lithography [53], synthetic colloidal techniques [38,54], and electrochemical reduction [47]. The resulting systems are expensive and often structurally rigid, making their implementation in high throughput, practical applications difficult.…”

Section: Discussionmentioning

confidence: 99%

“…Such metallodielectric films could be easily integrated with sensing device architectures that are disposable and rapidly replaceable. Films containing fractal arrays of metal nanoparticles have previously been generated through lithographic techniques [53], synthetic colloidal methods [38,54], and electrochemical reduction [47]. Drop casting techniques based on evaporation-induced self-assembly have also been employed to fabricate thin film-based SERS substrates [55,56,57].…”

Section: Introductionmentioning

confidence: 99%

Spontaneous Formation of Fractal Aggregates of Au Nanoparticles in Epoxy-Siloxane Films and Their Application as Substrates for NIR Surface Enhanced Raman Spectroscopy

Basker

Saravanamuttu

2017

Polymers

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Abstract:We present a facile, inexpensive route to free-standing, thermo-mechanically robust and flexible epoxy-siloxane substrates embedded with fractal aggregates of Au nanoparticles, and demonstrate their efficiency as substrates for surface enhanced Raman spectroscopy (SERS) at NIR wavelengths. The metallodielectric films are prepared by generating Au nanoparticles through the in-situ reduction of gold (III) chloride trihydrate in epoxypropoxypropyl terminated polydimethyl siloxane (EDMS). The metal nanoparticles spontaneously aggregate into fractal structures in the colloid, which could then be drop-cast onto a substrate. Subsequent UV-initiated cationic polymerization of epoxide moieties in EDMS transforms the fluid colloid into a thin, free-standing film, which contains a dense distribution of fractal aggregates of Au nanoparticles. We used electron and optical microscopy as well as UV-Vis-NIR spectrometry to monitor the evolution of nanoparticles and to optically and structurally characterize the resulting films. Raman spectroscopy of the chromophore Eosin Y adsorbed onto the metallodielectric films showed that they are excellent SERS substrates at NIR excitation with an enhancement factor of~9.3 × 10 3 .

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Validation of electromagnetic field enhancement in near-infrared through Sierpinski fractal nanoantennas

Cited by 32 publications

References 40 publications

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Plasmonic Antennas with Electric, Magnetic, and Electromagnetic Hot Spots Based on Babinet’s Principle

Realization of Fractal-Inspired Thermoresponsive Quasi-3D Plasmonic Metasurfaces with EOT-Like Transmission for Volumetric and Multispectral Detection in the Mid-IR Region

Spontaneous Formation of Fractal Aggregates of Au Nanoparticles in Epoxy-Siloxane Films and Their Application as Substrates for NIR Surface Enhanced Raman Spectroscopy

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