Tunable Frequency Filter Based on Twisted Bilayer Photonic Crystal Slabs

Lou, Beicheng; Fan, Shanhui

doi:10.1021/acsphotonics.1c01263

Cited by 17 publications

(16 citation statements)

References 28 publications

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Section: Other Miscellaneous Materials Systemsmentioning

confidence: 99%

“…[162] On the other hand, for polarization-independent optical filters, ultra-narrowband filters with a notch filter line shape can be achieved in a bilayer photonic slab, where the frequency to be filtered is tuned by simply changing the twist angle. [43] In the visible region, the differential transmission of LCP and RCP light might be exploited to enable color displays or color prints for data encryption. Xie et al fabricated twisted homo-and heterobilayers of polydiacetylene thin films in the blue and red phases as flexible color display units.…”

Section: Polarization-sensitive Optical Devicesmentioning

confidence: 99%

“…Similar realizations have been reported for twisted nanostructures of other 2D materials such as transition metal dichalcogenides, [ 38,39 ] graphitic carbon nitride, [ 40 ] and hexagonal boron nitride (hBN), [ 41 ] as well as non‐2D systems like polymeric thin films or patterned plasmonic nanohole arrays. [ 42,43 ] Therefore, there exists fertile ground for chiral metasurface design by utilizing different classes of materials, thus enriching both intrinsic materials properties and extrinsic designable device performance. Owing to the structure characteristics at nanoscale (Figure 2), they represent promising ultrathin chiral materials for use as or in highly compact optical devices.…”

Section: Introductionmentioning

confidence: 99%

“…Similar realizations have been reported for twisted nanostructures of other 2D materials such as transition metal dichalcogenides, [38,39] graphitic carbon nitride, [40] and hexagonal boron nitride (hBN), [41] as well as non-2D systems like polymeric thin films or patterned plasmonic nanohole arrays. [42,43] Therefore, there exists fertile ground for chiral metasurface design Artificial chiral nanostructures have been subjected to extensive research for their unique chiroptical activities. Planarized chiral films of ultrathin thicknesses are in particular demand for easy on-chip integration and improved energy efficiency as polarization-sensitive metadevices.…”

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Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

et al. 2022

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chiral plasmonic nanoparticles and their self-assembled structures as colloidal suspensions. [6][7][8][9] Recently, beyond noble metal plasmonics, solid-state layered nanomaterials that are rotationally aligned with a defined twist angle are becoming increasingly investigated (Figure 1). Among these are twisted 2D van der Waals (vdW) materials, [10][11][12] twisted single-crystal slabs, [13,14] twisted aligned nanowire thin films, [15][16][17][18] and twisted metasurfaces with periodic subunits [19][20][21] (Figure 2). These chiral stacked materials possessing geometric handedness and optical chirality can be seen as truncated and minimalistic versions of supramolecular liquid crystals in the chiral nematic phase or of 3D chiral photonic crystals. [22][23][24] Compared to their bulk or multiple-layer counterparts, the fabrication becomes greatly simplified for bilayer or few-layer chiral metamaterials, enabling precise control over the interlayer twist angle to manipulate lightmatter interactions. Ultrathin chiral metamaterials and metasurfaces with tunable optical and chiroptical responses are thus an active field for study.Twisting achiral layered nanostructures in parallel planes enables engineering of the extrinsic chirality and related optical performance. Specifically, the twist angle from counterclockwise rotation of an upper layer with respect to the beneath one is defined to be positive, θ > 0°, leading to a left-handed stacking geometry. [10,18] Accordingly, negative twist angle from clockwise rotation gives rise to the right-handed counterpart. Accurate control over the interlayer rotation angle offers flexible manipulation of properties, especially optical activity, of twisted layered systems of a wide variety of monolayer constituents and dimensions. A well-studied system is twisted bilayer graphene (TBG), catalyzing the research on twisted stacked nanostructures over the past few years, especially as many intriguing properties of magic-angle graphene are uncovered. [28][29][30] The twist angle dependencies of phonon dispersion, [31] optical absorption and reflection, [32,33] circular dichroism (CD) and birefringence, [10,34] second harmonic generation (SHG), [35] and photoresponse [36,37] of TBG have been extensively explored in the past few years. Similar realizations have been reported for twisted nanostructures of other 2D materials such as transition metal dichalcogenides, [38,39] graphitic carbon nitride, [40] and hexagonal boron nitride (hBN), [41] as well as non-2D systems like polymeric thin films or patterned plasmonic nanohole arrays. [42,43] Therefore, there exists fertile ground for chiral metasurface design Artificial chiral nanostructures have been subjected to extensive research for their unique chiroptical activities. Planarized chiral films of ultrathin thicknesses are in particular demand for easy on-chip integration and improved energy efficiency as polarization-sensitive metadevices. Recently, controlled twisted stacking of two or more layers of nanomaterials, such as 2D van der ...

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Section: Other Miscellaneous Materials Systemsmentioning

confidence: 99%

Section: Polarization-sensitive Optical Devicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Similar realizations have been reported for twisted nanostructures of other 2D materials such as transition metal dichalcogenides, [38,39] graphitic carbon nitride, [40] and hexagonal boron nitride (hBN), [41] as well as non-2D systems like polymeric thin films or patterned plasmonic nanohole arrays. [42,43] Therefore, there exists fertile ground for chiral metasurface design Artificial chiral nanostructures have been subjected to extensive research for their unique chiroptical activities. Planarized chiral films of ultrathin thicknesses are in particular demand for easy on-chip integration and improved energy efficiency as polarization-sensitive metadevices.…”

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confidence: 99%

mentioning

confidence: 99%

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Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

et al. 2022

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Novel Dielectric Nanogranular Materials with an Electrically Tunable Frequency Response

Cao

Kobayashi

Wang

et al. 2023

Adv Elect Materials

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In tunable filters, the passband frequency can be effectively tuned via mechanical, [2,3] magnetic, [4,5] or electrical approaches, [6] and have been explored using a variety of technologies, including switched capacitor networks, [7] microelectromechanical systems, [8] ferroelectric, [9] and ferromagnetic films. [4] Tunable frequency filters may cover multiple frequencies to meet different scenarios in multiple band operations.Nanogranular materials comprise disordered nanometer-sized granular metals dispersed in a host matrix and are a robust platform for studying complex disordered solids. [10,11] Based on this platform, a variety of intriguing phenomena have been discovered that involve the interplay of electronic, [12,13] magnetic, [14,15] optical, [16,17] and thermal properties, [18,19] as well as quantum [20] and superconductive behavior. [21] At diluted granular fractions (typically less than the percolation threshold of 50 vol%), the materials are in the dielectric regime, whereby both DC [22,23] and AC [24,25,26,27] electrical transport properties have been widely studied in this regime. In particular, the study of AC transport provides an in-depth understanding of the electric polarization associatedThe electrical modulation of the functionality of matter is of significant interest in physics and multifunctional tunable electronic device applications.Here, new dielectric materials with nanogranular structures comprised of nano-sized Co granular metals dispersed in a Mg-fluoride-based dielectric matrix are explored. The dielectric relaxation frequency (f r ), which represents a sharp decrease in dielectric permittivity in dielectrics, can be tuned by a DC electric field (E). As E increases, the position of f r first shifts to the lowfrequency side and then to the high-frequency side, achieving a tunable f r in a certain frequency range. The ability to electrically modulate the relaxation frequency may help construct novel tunable frequency filters. The dielectric properties are theoretically examined based on the asymmetric electron tunnelling model that considers the size difference of granular pairs, offering an insightful understanding of the structure-property relationship in disordered granular solids.

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RCWA4D: Electromagnetic solver for layered structures with incommensurate periodicities

Lou,

Fan

2025

Computer Physics Communications

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Tunable Frequency Filter Based on Twisted Bilayer Photonic Crystal Slabs

Cited by 17 publications

References 28 publications

Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

Recent Advances in Ultrathin Chiral Metasurfaces by Twisted Stacking

Novel Dielectric Nanogranular Materials with an Electrically Tunable Frequency Response

RCWA4D: Electromagnetic solver for layered structures with incommensurate periodicities

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