Boundary-Induced Auxiliary Features in Scattering-Type Near-Field Fourier Transform Infrared Spectroscopy

Yang, Jiong; Mayyas, Mohannad; Tang, Jianbo; Ghasemian, Mohammad B.; Yang, Honghua; Watanabe, Kenji; Taniguchi, Takashi; Ou, Qingdong; Li, Lu Hua; Bao, Qiaoliang; Kalantar‐zadeh, Kourosh

doi:10.1021/acsnano.9b08895

Cited by 15 publications

(14 citation statements)

References 35 publications

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“…They also chose dimensions for the periodic crystals that resulted in the domination of dipolar-like Bloch modes, as the dimensions of their periodic structures were comparable to the wavelengths of PhP waves in their presented bands . In addition to etching and patterning hBN flakes, the control of PhP propagations in continuous hBN has been realized by placing them onto substrates consisting of different dielectric environments. − However, a direct imaging of the near-field intensity patterns from the interaction of hBN with periodic dielectric structures remains largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Excited Archimedean-like Tiling Patterns in Phonon-Polaritonic Crystals

et al. 2021

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Phonon-polaritons (PhPs) arise from the strong coupling of photons to optical phonons. They offer light confinement and harnessing below the diffraction limit for applications including sensing, imaging, superlensing, and photonics-based communications. However, structures consisting of both suspended and supported hyperbolic materials on periodic dielectric substrates are yet to be explored. Here we investigate phonon-polaritonic crystals (PPCs) that incorporate hyperbolic hexagonal boron nitride (hBN) to a silicon-based photonic crystal. By using the near-field excitation in scattering-type scanning near-field optical microscopy (s-SNOM), we resolved two types of repetitive local field distribution patterns resembling the Archimedean-like tiling on hBN-based PPCs, i.e., dipolar-like field distributions and highly dispersive PhP interference patterns. We demonstrate the tunability of PPC band structures by varying the thickness of hyperbolic materials, supported by numerical simulations. Lastly, we conducted scattering-type nanoIR spectroscopy to confirm the interaction of hBN with photonic crystals. The introduced PPCs will provide the base for fabricating essential subdiffraction components of advanced optical systems in the mid-IR range.

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Section: Introductionmentioning

confidence: 99%

Near-Field Excited Archimedean-like Tiling Patterns in Phonon-Polaritonic Crystals

et al. 2021

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“…Here, 4 × 4 TMM is introduced to calculate the absorption, [ 22 ] and the transmission matrix of the entire device can be expressed as:

(\begin{matrix} A_{normals} \\ B_{normals} \\ A_{normalp} \\ B_{normalp} \end{matrix}) = (\begin{matrix} M_{11} & M_{12} & M_{13} & M_{14} \\ M_{21} & M_{22} & M_{23} & M_{24} \\ M_{31} & M_{32} & M_{33} & M_{34} \\ M_{41} & M_{42} & M_{43} & M_{44} \end{matrix}) (\begin{matrix} C_{normals} \\ 0 \\ C_{normalP} \\ 0 \end{matrix})

where ( A s , A p ), ( B s , B p ), and ( C s , C p ) are the amplitudes of incident light, reflected light, and transmitted light, respectively. The transmission and reflection coefficients of the entire device can be expressed as:

t_{normalpp} = {((), \frac{C_{p}}{A_{p}})}_{A s = 0} = \frac{M_{11}}{M_{11} M_{33} - M_{13} M_{31}}

t_{normalps} = {((), \frac{C_{s}}{A_{p}})}_{A s = 0} = \frac{- M_{13}}{M_{11} M_{33} - M_{13} M_{31}}

t_{normalss} = {((), \frac{C_{s}}{A_{s}})}_{A p = 0} = \frac{M_{33}}{M_{11} M_{33} - M_{13} M_{31}}

…”

Section: Structure and Theoretical Modelmentioning

confidence: 99%

Critical Coupling and Perfect Absorption Using α‐MoO₃ Multilayers in the Mid‐Infrared

Dong

Liu

2021

Annalen der Physik

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α‐Phase molybdenum trioxide(α‐MoO3) is a biaxial van der Waals semiconductor that can naturally support anisotropic phonon polaritons with elliptic and hyperbolic in‐plane dispersion. α‐MoO3 can meet critical coupling (CC) condition for both transverse magnetic (TM) and transverse electric (TE) polarizations along the x and y directions and exhibit high absorption in the mid‐infrared region due to strong phonon polaritons. In this study, an absorber composed of few‐layer α‐MoO3 and one‐dimensional photonic crystal separated by a cavity is proposed. Perfect absorption for TE and TM polarized light is achieved at the longitudinal and transverse optical phonon frequencies, respectively. The underlying mechanism of perfect absorption is investigated by using coupled mode theory and simulating electric field and power dissipation profiles. The results prove that CC is responsible for the perfect absorption. Moreover, the influence of the thickness of α‐MoO3 layer, width of cavity between α‐MoO3 and photonic crystal, and angle of incident light on the CC and absorption performance are examined. Accordingly, the rules for realizing perfect absorption at different operation frequencies are established. Overall, this study provides useful insights on designing a perfect absorber based on α‐MoO3 for detection and sensing applications in the mid‐infrared region.

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“…Since the material properties are as a function of the temperature, there would be a room for applying the dramatic changes of temperature gradient in the extremely narrow regime of the base materials and structures, such as nanophotonic applications. [40,41] Meanwhile, the S0 phase velocity of the Lamb waves follows the relation ∝ v…”

Section: Uw Engineering Functionsmentioning

confidence: 99%

Temperature‐Responsive Ultrasonic‐Wave Engineering Using Thermoresponsive Polymers

Lee

Lim

et al. 2021

Adv Funct Materials

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Artificial structures for controlling ultrasonic-waves are attractive for developing superb functions in sensing-imaging techniques. However, the complicated fabrication and fixed design associated with the particular wave limit the scalability. Herein, a versatile-reversible ultrasonic-wave engineering using programmable heating of local areas on thermoresponsive polymers is presented. As an abrupt shift of the elastic modulus occurs at selectively heated zones over the glass transition temperature, the drastic modulus change alters the S0 phase velocity of the Lamb wave within ultrasonic waves passing through the heated regimes. The modified wave propagation results in an active wavelength shift and wave refraction, which enables multifunctional programming of wave propagation pathways and wavefront shapes. Multiple functions such as reduced wavelength, wave steering, energy focusing and bifurcation are implemented in one nylon 6 thermoresponsive polymer, according to predesigned heating shapes. This work demonstrates the capability of temperature-responsive wave engineering in bulk solid media with only a heating configuration.

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Boundary-Induced Auxiliary Features in Scattering-Type Near-Field Fourier Transform Infrared Spectroscopy

Cited by 15 publications

References 35 publications

Near-Field Excited Archimedean-like Tiling Patterns in Phonon-Polaritonic Crystals

Near-Field Excited Archimedean-like Tiling Patterns in Phonon-Polaritonic Crystals

Critical Coupling and Perfect Absorption Using α‐MoO₃ Multilayers in the Mid‐Infrared

Temperature‐Responsive Ultrasonic‐Wave Engineering Using Thermoresponsive Polymers

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Boundary-Induced Auxiliary Features in Scattering-Type Near-Field Fourier Transform Infrared Spectroscopy

Cited by 15 publications

References 35 publications

Near-Field Excited Archimedean-like Tiling Patterns in Phonon-Polaritonic Crystals

Near-Field Excited Archimedean-like Tiling Patterns in Phonon-Polaritonic Crystals

Critical Coupling and Perfect Absorption Using α‐MoO3 Multilayers in the Mid‐Infrared

Temperature‐Responsive Ultrasonic‐Wave Engineering Using Thermoresponsive Polymers

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Product

Resources

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Critical Coupling and Perfect Absorption Using α‐MoO₃ Multilayers in the Mid‐Infrared