Polarization-selective modulation of supercavity resonances originating from bound states in the continuum

Kyaw, Chan; Yahiaoui, Riad; Burrow, Joshua A.; Tran, Vivian; Keelen, Kyron; Sims, Wesley; Red, Eddie; Rockward, Willie S.; Thomas, M.; Sarangan, Andrew; Agha, Imad; Searles, Thomas A.

doi:10.1038/s42005-020-00453-8

Cited by 49 publications

(40 citation statements)

References 53 publications

(72 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Once Au-grating arrays parallel to y-axis are introduced, a pronounced anticrossing curve indicating strong coupling enhancement of out-of-plane phonon modes shows up in the lower RS band when t Ge increases. What is more, two other anticross splitting phenomena are observed simultaneously around upper RS bands (Figure d).…”

Section: Experiments and Resultsmentioning

confidence: 99%

Enhanced Interaction of Optical Phonons in h-BN with Plasmonic Lattice and Cavity Modes

Song

Dereshgi

Palacios

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Hexagonal boron nitride (h-BN) is regarded as a milestone in the investigation of light interaction with phonon polaritons in two-dimensional van der Waals materials, showing significant potential in novel and high-efficient photonics devices in the mid-infrared region. Here, we investigate a structure composed of Au-grating arrays fabricated onto a Fabry−Perot (FP) cavity composed of h-BN, Ge, and Au back-reflector layers. The plasmonic FP cavity reduces the required device thickness by enhancing modal interactions and introduces in-plane polarization sensitivity based on the Au array lattice. Our experiments show multiple absorption peaks of over 90% in the mid-infrared region and the band stop filters with 80% efficiency using only a 15 nm h-BN slab. Moreover, mode interaction with experimental coupling strengths as high as 10.8 meV in the mid-infrared region is investigated. In particular, the interaction and hybridization of optical phonon modes with plasmonic modes including the lattice and cavity modes are studied. Anticrossing splitting ascribed to the coupling of optical phonons to plasmonic modes can be tuned by the designed geometry which can be tailored to efficient response band engineering for infrared photonics. We also show that in practical applications involving wet transfer of h-BN thin films, the contribution of minor optical phonon modes to resonant peaks should not be ignored, which originate from defects and multicrystallinity in the h-BN slab. Our findings provide a favorable complement to manipulation of light−phonon interaction, inspiring a promising design of phonon-based nanophotonic devices in the infrared range.

show abstract

Section: Experiments and Resultsmentioning

confidence: 99%

Enhanced Interaction of Optical Phonons in h-BN with Plasmonic Lattice and Cavity Modes

Song

Dereshgi

Palacios

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…At each loop, two current paths were formed with the surface current flowing in opposite direction, thus creating a parallel loop [24], forming a magnetic dipole. The surface current distribution radiates strongly to the free space, allowing a broader resonance in the transmission spectrum to be achieved [51]. In the surface current distribution for FSS 2 (see Figure 8a) at f r = 26.4 GHz, the surface current mainly concentrated at the edge sides of the centre patch (D part), as well as at the area between patch integration and small loops (E part), which flowed in negative y-direction.…”

Section: Surface Current Distributionmentioning

confidence: 99%

“…At each loop, two current paths were formed with the surface current flowing in opposite direction, thus creating a parallel loop [24], forming a magnetic dipole. The surface current distribution radiates strongly to the free space, allowing a broader resonance in the transmission spectrum to be achieved [51]. For FSS 3, introducing patches at part the A of the MFSS yielded a single big loop, as illustrated in Figure 9.…”

Section: Surface Current Distributionmentioning

confidence: 99%

Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation

et al. 2022

View full text Add to dashboard Cite

Acquiring an optically transparent feature on the wideband frequency selective surface (FSS), particularly for smart city applications (building window and transportation services) and vehicle windows, is a challenging task. Hence, this study assessed the performance of optically transparent mosaic frequency selective surfaces (MFSS) with a conductive metallic element unit cell that integrated Koch fractal and double hexagonal loop fabricated on a polycarbonate substrate. The opaque and transparent features of the MFSS were studied. While the study on opaque MFSS revealed the advantage of having wideband responses, the study on transparent MFSS was performed to determine the optical transparency application with wideband feature. To comprehend the MFSS design, the evolutionary influence of the unit cell on the performance of MFSS was investigated and discussed thoroughly in this paper. Both the opaque and transparent MFSS yielded wideband bandstop and bandpass responses with low cross-polarisation (−37 dB), whereas the angular stability was limited to only 25°. The transparent MFSS displayed high-level transparency exceeding 70%. Both the simulated and measured performance comparison exhibited good correlation for both opaque and transparent MFSS. The proposed transparent MFSS with wideband frequency response and low cross-polarisation features signified a promising filtering potential in multiple applications.

show abstract

“…In general, the symmetry of the structure is disturbed by breaking the geometric structure of the metasurface to excite the SP-BIC, such as split rings [ 86 , 87 ], asymmetric nanorods [ 78 , 88 ], notched cubes [ 69 ], and so on. Due to the limitation of fabrication, it is difficult to control its asymmetric parameter in the experiment, so it is difficult to obtain an ultra-high Q-factor by this method.…”

Section: Optical Radiation For Different Nanostructure Parametersmentioning

confidence: 99%

Manipulating Optical Scattering of Quasi-BIC in Dielectric Metasurface with Off-Center Hole

Zhou

Huang

et al. 2021

Nanomaterials

View full text Add to dashboard Cite

Bound states in the continuum (BICs) correspond to a particular leaky mode with an infinitely large quality-factor (Q-factor) located within the continuum spectrum. To date, most of the research work reported focuses on the BIC-enhanced light matter interaction due to its extreme near-field confinement. Little attention has been paid to the scattering properties of the BIC mode. In this work, we numerically study the far-field radiation manipulation of BICs by exploring multipole interference. By simply breaking the symmetry of the silicon metasurface, an ideal BIC is converted to a quasi-BIC with a finite Q-factor, which is manifested by the Fano resonance in the transmission spectrum. We found that both the intensity and directionality of the far-field radiation pattern can not only be tuned by the asymmetric parameters but can also experience huge changes around the resonance. Even for the same structure, two quasi-BICs show a different radiation pattern evolution when the asymmetric structure parameter d increases. It can be found that far-field radiation from one BIC evolves from electric-quadrupole-dominant radiation to toroidal-dipole-dominant radiation, whereas the other one shows electric-dipole-like radiation due to the interference of the magnetic dipole and electric quadrupole with the increasing asymmetric parameters. The result may find applications in high-directionality nonlinear optical devices and semiconductor lasers by using a quasi-BIC-based metasurface.

show abstract

Polarization-selective modulation of supercavity resonances originating from bound states in the continuum

Cited by 49 publications

References 53 publications

Enhanced Interaction of Optical Phonons in h-BN with Plasmonic Lattice and Cavity Modes

Enhanced Interaction of Optical Phonons in h-BN with Plasmonic Lattice and Cavity Modes

Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation

Manipulating Optical Scattering of Quasi-BIC in Dielectric Metasurface with Off-Center Hole

Contact Info

Product

Resources

About