Enhanced quality factor of Fano resonance in optical metamaterials by manipulating configuration of unit cells

Moritake, Yuto; Kanamori, Yoshiaki; Hane, Kazuhiro

doi:10.1063/1.4936385

Cited by 27 publications

(16 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An approach would be to manipulate the configuration of unit cells in the metamaterial array to mitigate radiative losses. It was reported that by alternating or inverting an asymmetric dipole bars (which constitute to one of the two sub‐unit cells) and placing it adjacent to neighboring asymmetric dipole bars, an enhancement in the Q ‐factor of Fano resonance is achieved. Based on the schematic of dipole–dipole interference, an enhancement in the Q ‐factor of Fano resonance in an alternating unit cell configuration was ascribed to destructive interference of dipole moments contributed by neighboring sub‐unit cells as illustrated in Figure c.…”

Section: Perspectives To Loss Engineeringmentioning

confidence: 99%

“…As a result, the net dipole moment of an alternating unit cell configuration is smaller than the nonalternating unit cell configuration. Therefore, the radiative loss in an alternating unit cell configuration is much lower, establishing a higher Q ‐factor . Quantitative analysis of complementary asymmetric double bars using multipole decomposition reveals that the linewidth narrowing of resonance in an inverted unit cell configuration is due to the competition between magnetic quadrupole and toroidal dipole.…”

Section: Perspectives To Loss Engineeringmentioning

confidence: 99%

See 1 more Smart Citation

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Lim

Manjappa

Pitchappa

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

Advances in plasmonic metamaterials have been rapidly evolving with innovations aimed at developing metadevices for real-world applications. In reality, energy losses in plasmonic systems are prevalent and it is of paramount importance to come up with solutions that could overcome the limitations that impede further advancements toward the miniaturization of optoelectronic metadevices. High-Q Fano resonance as a scattering phenomenon can be easily triggered by introducing asymmetry into plasmonic systems, and thus it offers a simple approach for reducing radiative losses through lineshape engineering. High-Q Fano resonance possesses narrow linewidth and intensely confined electromagnetic fields, which makes it viable for widespread applications. The purpose of this review is to consolidate the current advances and contributions that high-Q Fano resonance has made in the metamaterial community. Two general modes of energy loss including radiative and nonradiative losses are introduced and possible ways to overcome these challenges are examined. Furthermore, applications based on high-Q Fano resonance including sensors, lasing spasers, and optical switches are discussed, embracing the future of Fano resonance based high performance photonic technologies.

show abstract

Section: Perspectives To Loss Engineeringmentioning

confidence: 99%

Section: Perspectives To Loss Engineeringmentioning

confidence: 99%

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Lim

Manjappa

Pitchappa

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…The interactions among meta-atoms have great influence upon the Q-factor. Effects of different relative configurations of unit cells on the Q-factor of resonances have been studied in metallic metamaterials 15 , 21 – 23 , which have not been taken into account in all-dielectric metamaterials yet.…”

Section: Introductionmentioning

confidence: 99%

Q-factor enhancement of Fano resonance in all-dielectric metasurfaces by modulating meta-atom interactions

Sun

Yuan

Zhang

et al. 2017

Sci Rep

View full text Add to dashboard Cite

We numerically investigated the effects of meta-atom interactions on the Fano resonance in all-dielectric metasurfaces by introducing alternately flipped asymmetric paired bars (APBs) and split asymmetric paired bars (SAPBs). With alternately flipped configurations, the Q-factor of the Fano resonance is significantly enhanced up to one order of magnitude, and the electric field is strengthened by more than twice. Abnormally, the Q-factor increases with gap size in the alternately flipped SAPBs. These are attributed to the destructive interaction among nearest-neighbor dipole resonators. The Q-factor of 108 and Raman enhancement factor of 109 in the gap can be realized with the alternately flipped SAPBs made of Si. Our study provides a way to improve performance of practical devices such as ultrasensitive sensors, nonlinear optics, and quantum emitters.

show abstract

“…9 EIT is a quantum interference phenomenon that occurs in atoms interacting with electromagnetic fields, 10,11 and various types of metasurfaces and metamaterials that mimic EIT have been intensively studied. [12][13][14][15][16][17][18][19][20][21][22] An important feature of this EIT-like metasurface, which is composed of two types of radiatively a) Electronic mail: tamayama@vos.nagaokaut.ac.jp coupled cut-wire resonators, is the local electric field enhancement, which is stronger than that in a metasurface composed of only one type of cut-wire resonator (Lorentz-type metasurface) because of the compression of the electromagnetic energy density associated with the low-group-velocity propagation. This implies that studying EIT-like metasurfaces and metamaterials may lead to the development of a useful method for plasma generation.…”

Section: -8mentioning

confidence: 99%

Microplasma generation by slow microwave in an electromagnetically induced transparency-like metasurface

Tamayama

Sakai

2017

Journal of Applied Physics

View full text Add to dashboard Cite

Microplasma generation using microwaves in an electromagnetically induced transparency (EIT)-like metasurface composed of two types of radiatively coupled cut-wire resonators with slightly different resonance frequencies is investigated. Microplasma is generated in either of the gaps of the cut-wire resonators as a result of strong enhancement of the local electric field associated with resonance and slow microwave effect. The threshold microwave power for plasma ignition is found to reach a minimum at the EIT-like transmission peak frequency, where the group index is maximized. A pump-probe measurement of the metasurface reveals that the transmission properties can be significantly varied by varying the properties of the generated microplasma near the EIT-like transmission peak frequency and the resonance frequency. The electron density of the microplasma is roughly estimated to be of order 1 × 10 10 cm −3 for a pump power of 15.8 W by comparing the measured transmission spectrum for the probe wave with the numerically calculated spectrum. In the calculation, we assumed that the plasma is uniformly generated in the resonator gap, that the electron temperature is 2 eV, and that the elastic scattering cross section is 20 × 10 −16 cm 2 .

show abstract

Enhanced quality factor of Fano resonance in optical metamaterials by manipulating configuration of unit cells

Cited by 27 publications

References 29 publications

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Shaping High‐Q Planar Fano Resonant Metamaterials toward Futuristic Technologies

Q-factor enhancement of Fano resonance in all-dielectric metasurfaces by modulating meta-atom interactions

Microplasma generation by slow microwave in an electromagnetically induced transparency-like metasurface

Contact Info

Product

Resources

About