Tunable one-dimensional photonic crystal slabs based on preferential etching of silicon-on-insulator

Zografopoulos, Dimitrios C.; Kriezis, Emmanouil E.; Bellini, Bob; Beccherelli, Romeo

doi:10.1364/oe.15.001832

Cited by 24 publications

(14 citation statements)

References 28 publications

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“…In order to further elucidate the nature of the resonance broadening in the measured spectra, we resort to an approximate interpretation based on a weighted average of the simulated spectra. This approach accounts for the observed nonuniformity of the fabricated prismatic element shape due to, for instance, slightly diverse etching rates of the planes exposed in different elements or small variations of the etching angle, which is often found to deviate from the theoretical value of 54.7° during the etching of convex angles …”

Section: Resultsmentioning

confidence: 99%

All‐Dielectric Silicon Metasurface with Strong Subterahertz Toroidal Dipole Resonance

Zografopoulos

Ferraro

Algorri

et al. 2019

Advanced Optical Materials

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properties of propagating electromagnetic waves, such as wave front, polarization, intensity, or spectrum, in ways unachievable by bulk materials of the same subwavelength thickness. [1][2][3] The constituent elements of a metasurface can be either metallic or dielectric and they are usually patterned on a low-loss, dielectric substrate. All-dielectric metasurfaces, in particular, which are composed of elements made of a high-refractive index dielectric material, have been lately attracting more attention, as they show a very high diversity of exploitable properties, while being free from ohmic losses associated with the presence of metals. [4] The potential of dielectric metasurfaces as a platform for low-loss, compact, functional components has been extensively demonstrated in numerous applications, such as reflection/refraction control and wave-front shaping, [5][6][7][8] lensing, [9] control of light emission [10,11] or photoluminescence, [12,13] polarization control [14,15] and polarimetry, [16] generation of vortex beams, [17] highly selective filtering, [18,19] or enhancement of nonlinear processes. [20,21] In addition to offering novel solutions in practical applications, metasurfaces can also provide insight in theoretical physics, optics, and the investigation of phenomena based on particular light-matter interaction conditions. One such case is that of toroidal modes, which have been under intense investigation, thanks to their unusual electromagnetic properties. The toroidal dipole, the simplest toroidal mode, is generated by a current flowing in a solenoid, which is bent into a torus. Under certain conditions, the excitation of the toroidal dipole can interfere destructively with the electric dipole mode and cancel the far-field scattering radiation of dielectric particles, in the so-called "anapole" state. [22] Since decades ago, toroidal modes were employed in physics, for instance, to explain the parity violation of the weak interactions in atomic nuclei, [23] to propose models of stable atoms, [24] or to describe dark matter. [25] In recent years, though, the interest on electromagnetic toroidal moments is rapidly increasing as, apart from the fundamental physical insight, they can be harnessed in numerous applications. [26,27] Toroidal modes in individual dielectric particles or small clusters have been theoretically proposed for the excitation of toroidal response, [28] cloaking, [29] enhanced absorption, [30] and nanolasing [31] or experimentally demonstrated as nonradiating sources [32] and for the enhancement of nonlinear effects. [33,34] Moreover, it A single-layer, all-dielectric metasurface exhibiting a strong toroidal resonance in the low-atmospheric loss radio window of the subterahertz W-band is theoretically proposed and experimentally demonstrated. The metasurface is fabricated on a high-resistivity floating-zone silicon wafer by means of a singleprocess, wet anisotropic etching technique. The properties of the toroidal mode of both the constituent dielectric elements and the metasur...

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Section: Resultsmentioning

confidence: 99%

All‐Dielectric Silicon Metasurface with Strong Subterahertz Toroidal Dipole Resonance

Zografopoulos

Ferraro

Algorri

et al. 2019

Advanced Optical Materials

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“…Only the transverse electric (TE) polarization is considered in the simulation with its electric field in both x and y directions, and magnetic field only in the z direction. The 2-D FDTD [12] and 3-D FDTD [13] studies on the same photonic crystal slab with a defect shows significant difference in output transmission. The discrepancy is mainly due to the 2-D simulation method does not taking into consideration the out-of-plane scattering losses.…”

Section: °Waveguide Designmentioning

confidence: 88%

Structure Tuned, High Transmission 180$^{\circ}$ Waveguide Bend in 2-D Planar Photonic Crystal

Tee

Shee

Tamchek

et al. 2013

IEEE Photon. Technol. Lett.

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We present a high transmission, small bending radius, 180°waveguide bend based on triangular lattice air holes two-dimensional (2-D) planar photonic crystal. The desired high transmission is achieved by altering the waveguide structure at the bending region. Drop hole defects are introduced at the bending region to guide the incoming electromagnetic wave. Simulation results based on the 2-D finite difference time domain method show that normalized transmission as high as 99.4% is achieved at 1550 nm optical wavelength and it is >94% for nearly the entire optical C-band. In addition, the small bending radius enhances the suitability of our design to be used in ultra-compact photonic integrated circuits.

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“…A preliminary theoretical study investigating the optical properties of the corresponding 2D geometry [18] showed that a bandgap effectively appears in such a structure. It has also been described how the bandgap is modified by reorienting the LC infiltrated in the grooves.…”

Section: Introductionmentioning

confidence: 99%

Tunable optical properties of silicon-on-insulator photonic crystal slab structures

Tasolamprou¹,

Bellini²,

Zografopoulos³

et al. 2009

JEOS:RP

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A photonic crystal slab structure with one-dimensional periodicity, obtained by preferential etching of a silicon-on-insulator wafer, is numerically investigated in 3-D. The etched grooves are considered to be filled either with an isotropic or with a Nematic Liquid Crystal (NLC) material. The molecular director is calculated using a consistent model of NLC reorientation under an external voltage. Different structures together with a broad range of voltage values are numerically simulated by means of a three-dimensional finite-difference timedomain method. The shifting of the photonic bandgap induced by the applied voltage, as well as its sensitivity in terms of refractometric applications, are discussed for a range of different structure geometries.

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Tunable one-dimensional photonic crystal slabs based on preferential etching of silicon-on-insulator

Cited by 24 publications

References 28 publications

All‐Dielectric Silicon Metasurface with Strong Subterahertz Toroidal Dipole Resonance

All‐Dielectric Silicon Metasurface with Strong Subterahertz Toroidal Dipole Resonance

Structure Tuned, High Transmission 180$^{\circ}$ Waveguide Bend in 2-D Planar Photonic Crystal

Tunable optical properties of silicon-on-insulator photonic crystal slab structures

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