Guided-mode resonant narrowband terahertz filtering by periodic metallic stripe and patch arrays on cyclo-olefin substrates

Ferraro, Antonio; Zografopoulos, Dimitrios C.; Caputo, Roberto; Beccherelli, Romeo

doi:10.1038/s41598-018-35515-z

Cited by 52 publications

(16 citation statements)

References 55 publications

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“…[20] This limits the possibility of independent tailoring of resonance features at will. [34] Here, we experimentally demonstrate silicon-based all-dielectric metasurfaces that support GMRs at THz frequencies.The 2D metasurface, building block with periodic array of subwavelength silicon microstructures, simultaneously acts as the diffraction grating as well as the slab waveguide and hence enables the observation of GMRs. [8] Due to this versatile nature of GMRs, they have found wide range of applications, including extremely high-Q filters, ultrabroadband reflectors, wavelength selective polarizers, and beam splitters.…”

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confidence: 89%

Guided‐Mode Resonances in All‐Dielectric Terahertz Metasurfaces

Han

Rybin

Pitchappa

et al. 2019

Advanced Optical Materials

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The important parameters that describe a resonance feature are its intensity and spectral linewidth. For most practical applications, resonances with strong intensity and narrow linewidth are desirable. Higher resonance intensity provides better signal to noise ratio, while narrower linewidth signifies larger field confinement. However, most of the resonances are constrained by the trade-off between resonance intensity and linewidth. [20] This limits the possibility of independent tailoring of resonance features at will. On the contrary, guided mode resonance (GMR) can provide arbitrary resonance intensity and linewidth through geometrical design and selection of materials. [8] Due to this versatile nature of GMRs, they have found wide range of applications, including extremely high-Q filters, ultrabroadband reflectors, wavelength selective polarizers, and beam splitters. [8,[21][22][23][24][25][26][27][28][29][30][31] The GMR filter primarily comprises of a diffractive grating and an in-plane waveguide. The grating diffracts the incident light and couples it into the waveguide, which propagates as a guided mode. However, this guided mode is designed to be leaky, which then interferes with the free-space propagating electromagnetic wave to give rise to the GMRs. Through the selection of material, grating design, dielectric layer thickness, and angle of incidence, GMRs can provide a wide range of spectral features. Currently, the exploration of GMRs is limited to optical and radio frequency regions of the electromagnetic spectrum. However, terahertz (THz) technologies are attracting a lot of attention to cater to the challenges of meeting ever-increasing demand for highspeed wireless communications. [32] THz GMR devices could play a crucial role in communication applications due to its capability for constructing high-Q filters, polarization selective beam splitters, differentiators, integrators, and wavelength division (de)multiplexers. [8] Earlier reports on THz GMRs were realized through 1D grating elements on quartz substrate [33] and periodic metallic patterns on cyclo-olefin substrates. [34] Here, we experimentally demonstrate silicon-based all-dielectric metasurfaces that support GMRs at THz frequencies.The 2D metasurface, building block with periodic array of subwavelength silicon microstructures, simultaneously acts as the diffraction grating as well as the slab waveguide and hence enables the observation of GMRs. At oblique incidence, two frequency detuned GMRs are observed, which arises from two Coupling of diffracted waves in gratings with the waveguide modes gives rise to the guided mode resonances (GMRs). The GMRs provide designer linewidth and resonance intensity amidst a broad background, and thus have been widely used for numerous applications in visible and infrared spectral regions. Here, terahertz GMRs are demonstrated in low-loss, all-dielectric metasurfaces, which are periodic square lattices of silicon cuboids on quartz substrates. The silicon cuboid lattice simultaneously acts as a diffract...

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confidence: 89%

Guided‐Mode Resonances in All‐Dielectric Terahertz Metasurfaces

Han

Rybin

Pitchappa

et al. 2019

Advanced Optical Materials

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“…This trend in research is thus promoting the evolution of comprehensive numerical packages that provide extremely accurate descriptions of physical processes. [1][2][3] Handily, commercial packages now provide highly reliable modeling of phenomena like structural or uid behaviors, [4][5][6][7] wave propagation, [8][9][10][11][12][13] and thermal transport, [14][15][16] to name but a few. As a consequence, the availability of such powerful tools is modifying the way research is performed, eventually suggesting new possibilities to optimize the scientic procedure itself.…”

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confidence: 99%

A comprehensive optical analysis of nanoscale structures: from thin films to asymmetric nanocavities

et al. 2019

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“…Photonics 2019, 6, x 4 of 17 A cyclic olefin homopolymer commercially known as Zeonex grade 480R was chosen as the host material due to its unique optical properties in THz frequencies compared with other commonly used polymer materials. Zeonex has a low absorption rate of 0.2 cm -1 at 1 THz frequency and a flat refractive index of approximately 1.53 in the 0.1-2 THz spectral range [33,34], which translate into negligible dispersion [35]. It is also not water-absorbent [36], is insensitive to humidity [37], and has chemical inertness with bio-sensing properties [36].…”

Section: Comparison Of Te Qe and Pe Geometriesmentioning

confidence: 99%

Proposal for a Quad-Elliptical Photonic Crystal Fiber for Terahertz Wave Guidance and Sensing Chemical Warfare Liquids

et al. 2019

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A porous-core photonic crystal fiber based on a cyclic olefin homopolymer (Zeonex) is proposed; it shows high birefringence, high core power fraction, low losses, and near-zero flat dispersion. The fiber’s core was designed with quad-elliptical (QE) air holes with its center occupied by bulk background material. The superiority of the QE design over the commonly adopted tri- and penta-elliptical (TE and PE) core designs is demonstrated. The presence of the bulk material at the core center and the geometrical configuration cause a broad contrast in phase refractive indices, thereby producing high birefringence and low transmission losses. A high birefringence of 0.096 was obtained at 1.2 THz, corresponding to a total loss of 0.027 cm−1 and core power fraction of approximately 51%. The chromatic dispersion and effective area of the reported fiber were also characterized within a frequency range of 0.4–1.6 THz. The QE air holes were then filled with chemical warfare agents, namely, tabun and sarin liquids. Then, the relative sensitivity, confinement loss, fractional power flow, and effective material loss (EML) of the sensor were calculated. Nearly the same relative sensitivity (r = 64%) was obtained when the QE core was filled with either liquid. Although the obtained EML for tabun was 0.033 cm−1 and that for sarin was 0.028 cm−1, the confinement loss of the fiber when it was immersed in either liquid was negligible. The proposed fiber can be fabricated using existing fabrication technologies. Moreover, it can be applied and utilized as a THz radiation conveyor in a terahertz time domain spectroscopy system for remote sensing of chemical liquids in the security and defense industries.

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Guided-mode resonant narrowband terahertz filtering by periodic metallic stripe and patch arrays on cyclo-olefin substrates

Cited by 52 publications

References 55 publications

Guided‐Mode Resonances in All‐Dielectric Terahertz Metasurfaces

Guided‐Mode Resonances in All‐Dielectric Terahertz Metasurfaces

A comprehensive optical analysis of nanoscale structures: from thin films to asymmetric nanocavities

Proposal for a Quad-Elliptical Photonic Crystal Fiber for Terahertz Wave Guidance and Sensing Chemical Warfare Liquids

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