Crystalline Grating-Waveguide Resonant reflectors

Mourkioti, Georgia; Govindassamy, Goby; Li, F.; Eason, R.W.; Ahmed, Marwan Abdou; Mackenzie, Jacob I.

doi:10.1051/epjconf/202226702021

Cited by 3 publications

(3 citation statements)

References 2 publications

(2 reference statements)

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“…During the development of the PLD process for the structured sapphire substrates, there were several cases where significant texture in the as-deposited film surfaces was observed, which likely would lead to scattering losses and compromise the performance of these devices [22]. Subsequent tests revealed that it was the laser heating power that was critical for reducing the films' texture.…”

Section: Surface Topographymentioning

confidence: 99%

Sc2O3 on sapphire all-crystalline grating–waveguide resonant reflectors

et al. 2023

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This paper reports the fabrication and first demonstration of all-dielectric crystalline grating–waveguide reflectors comprising a Sc2O3 waveguide grown on a sub-wavelength-patterned sapphire substrate. Rigorous coupled-wave analysis is employed to simulate the operation of the structure, suggesting a 100% resonance reflectivity in theory. Structuring of the sapphire substrate is achieved using inductively coupled plasma etching, whilst pulsed laser deposition is used for epitaxial growth of the Sc2O3 crystalline waveguide. Devices with distinct TE- and TM-polarisation resonances around 1030-nm for an angle of incidence near 10° are demonstrated, with reflectance approaching 90%. The discrepancy in reflectivity is attributed to the waveguide thickness variation and surface roughness. Refinement of the fabrication processes and tolerances should lead to improvement in the surface quality of the crystalline grating–waveguide structure and operation closer to the ideal resonance reflectivity.

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Section: Surface Topographymentioning

confidence: 99%

Sc2O3 on sapphire all-crystalline grating–waveguide resonant reflectors

et al. 2023

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“…Sub-wavelength Grating (SWG) is a necessary and effective structure for achieving metamaterial synthesis due to its strong anisotropy and flat dispersion. It is the mechanism of coupling incident light from free space to waveguide modes using SWG that Danish B et al [10]. Sub-wavelength structures for metamaterials allow control of the refractive index of optical materials in different orientations, providing novel approaches and ideas for the design of optical devices [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Research on polarization beam splitter based on metamaterial subwavelength structure

Wang

Hou

et al. 2023

Preprint

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Functional devices based on metamaterials have received increasing attention in recent years due to their ability to make optical devices ultra-compact and densely integrated. To address the problems of polarisation-related losses and excessive size in polarisation beam splitters (PBS), and improve its efficiency, a new PBS based on metamaterial subwavelength structure is proposed in this paper. It achieves an ultra-compact coupling region of 1.9 × 8.2 µm2, which can effectively restrain TE polarization coupling and increase TM polarization coupling. The numerical analysis results show that both TE and TM polarizations have an insertion loss of < 0.5 dB and an extinction ratio of > 20 dB within a bandwidth of 65 nm, covering the entire C-band. At 1550 nm, the extinction ratio of TM polarization is as high as 41 dB. Realize a small footprint, short coupling length, and high-efficiency PBS.

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“…In the present contribution, we report on a RWG composed of a Ta2O5 waveguide layer coated on a structured sapphire substrate with better thermal performance at high average laser power (i.e., at high-power densities on the grating surface). The designed device consists of a single Ta2O5 layer of 200 -235 nm thickness deposited upon a binary grating with a period of 515 nm and a groove depth of 120 nm etched into a sapphire (Al2O3) substrate [2]. The RWG was designed to operate for TE polarization at 1030 nm and an angle of incidence of ~ 10°.The suitable choice of substrate material offers a thermal conductivity that is an order of magnitude higher than fused silica.…”

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confidence: 99%

Improved Thermal Performances of Resonant Reflection Waveguide Grating Structure

Boubekraoui,

Bashir,

Mourkioti

et al. 2023

2023 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Crystalline Grating-Waveguide Resonant reflectors

Cited by 3 publications

References 2 publications

Sc2O3 on sapphire all-crystalline grating–waveguide resonant reflectors

Sc2O3 on sapphire all-crystalline grating–waveguide resonant reflectors

Research on polarization beam splitter based on metamaterial subwavelength structure

Improved Thermal Performances of Resonant Reflection Waveguide Grating Structure

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