Optically-reconfigurable phase change material nanoantenna-embedded metamaterial waveguide

Varri, Venkata Sai Akhil; Tripathi, Devdutt; Vyas, Hardik; Agarwal, Prankush

doi:10.1364/ome.418529

Cited by 9 publications

(8 citation statements)

References 43 publications

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“…The GST refractive indices for the amorphous and crystalline states are taken from Gholipour et al., 48 and those of air, 49 silica, 50 and silver 51 are taken from the relevant sources. The results acquired are logically coherent and agree with our previous works 52 , 53 …”

Section: Geometry and Optical Responsesupporting

confidence: 92%

“…However, the study does not include a crystalline to amorphous transition, which requires using tailored optical pulses to achieve minimum quenching rates (≥109 K/s 17 ). This requires using pulsed wave thermo-optic sources and complex thermal-transient analysis to enhance the operation speed 52 . For investigating the VIS, MWIR, and LWIR, new chalcogenides such as Sb2Se3, Sb2normalS3, etc.…”

Section: Discussionmentioning

confidence: 99%

“…This requires using pulsed wave thermo-optic sources and complex thermal-transient analysis to enhance the operation speed. 52 For investigating the VIS, MWIR, and LWIR, new chalcogenides such as Sb 2 Se 3 , Sb 2 S 3 , etc. in addition to different meta-atom shapes may be explored.…”

Section: Discussionmentioning

confidence: 99%

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Optimally designed tunable phase change material-based narrowband perfect absorber

Tripathi

Hegde

2023

J. Nanophoton.

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.In recent years, there has been a growing interest in active metasurfaces. In particular, phase change material-based metasurfaces offering all-optical reconfigurability are being explored. Despite recent progress, further improvement in device reconfiguration energies and optical contrast achievable between the amorphous and crystalline states is desirable. In this work, we demonstrate that using a mirror-backed chalcogenide-based narrowband perfect absorber metasurface can significantly improve the device’s reflection contrast at much lower energies than its mirrorless case. By considering a GST225 metasurface operating in the near IR, our systematic numerical study finds improved reflection contrast (up to −32 dB, Q-factor 19.22 compared with 9.59 dB, Q-factor 11 for the mirrorless case). For the mirrored case, the thermal study finds faster crystallization (up to 6 times) at reduced reconfiguration thresholds (72 times lower) compared with the mirrorless case. This results in a more than 2 orders of magnitude higher device figure of merit [defined as the change in reflection contrast (in dB) to a corresponding change in optical energy (in nJ)] compared with the mirrorless case. The results are promising for high-performance metasurfaces at reduced switching energies.

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Section: Geometry and Optical Responsesupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Optimally designed tunable phase change material-based narrowband perfect absorber

Tripathi

Hegde

2023

J. Nanophoton.

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“…(e) Schematic of optically reconfigurable waveguide. High-power optical pulses are used to change the phase of the GST while low-power read pulses can transmit low or high transmittance values depending on the state of the GST deployed on top; (right) 2D cross-sectional view showing GST deployed on top of Si 3 N 4 , which is switched through evanescent coupling[94].…”

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confidence: 99%

On-Chip Integrated Photonic Devices Based on Phase Change Materials

Nisar

Yang

et al. 2021

Photonics

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Phase change materials present a unique type of materials that drastically change their electrical and optical properties on the introduction of an external electrical or optical stimulus. Although these materials have been around for some decades, they have only recently been implemented for on-chip photonic applications. Since their reinvigoration a few years ago, on-chip devices based on phase change materials have been making a lot of progress, impacting many diverse applications at a very fast pace. At present, they are found in many interesting applications including switches and modulation; however, phase change materials are deemed most essential for next-generation low-power memory devices and neuromorphic computational platforms. This review seeks to highlight the progress thus far made in on-chip devices derived from phase change materials including memory devices, neuromorphic computing, switches, and modulators.

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“…Resonating structures such as the traditionally used ring-resonator loaded PCM islands [44] have been explored owing to their fabrication feasibility and tuning, but they occupy a larger chip area compared to plain waveguides, thus limiting the device scalability. As an alternative, the structured waveguides such as sub-wavelength grating (SWG) waveguides [45], photonic crystal (PhC) cavity waveguides [46], endtapered [47] and center-tapered waveguides [48], phaseshifted Bragg grating (PSBG) waveguides [49] are some structures finding favor recently. The high-Q resonances and improved switching mechanisms (using electrical, mix-mode, and thermal means) offer higher extinction ratios and lowenergy requirements.…”

Section: Classification Of Pcm Nanophotonic Structuresmentioning

confidence: 99%

Recent developments in Chalcogenide phase change material-based nanophotonics

Tripathi,

Vyas,

Kumar

et al. 2023

Nanotechnology

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There is now a deep interest in actively reconfigurable nanophotonics as they will enable the next generation of optical devices. Of the various alternatives being explored for reconfigurable nanophotonics, Chalcogenide phase change materials (PCMs) are considered highly promising owing to the nonvolatile nature of their phase change. Chalcogenide PCM nanophotonics can be broadly classified into integrated photonics (with guided wave light propagation) and Meta-optics (with free space light propagation). Despite some early comprehensive reviews, the pace of development in the last few years has shown the need for a topical review. Our comprehensive review covers recent progress on nanophotonic architectures, tuning mechanisms, and functionalities in tunable PCM Chalcogenides. In terms of integrated photonics, we identify novel PCM nanoantenna geometries, novel material utilization, the use of nanostructured waveguides, and sophisticated excitation pulsing schemes. On the meta-optics front, the breadth of functionalities has expanded, enabled by exploring design aspects for better performance. The review identifies immediate, and intermediate-term challenges and opportunities in (1) the development of novel chalcogenide PCM, (2) advance in tuning mechanism, and (3) formal inverse design methods, including machine learning augmented inverse design, and provides perspectives on these aspects. The topical review will interest researchers in further advancing this rapidly growing subfield of nanophotonics.

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Optically-reconfigurable phase change material nanoantenna-embedded metamaterial waveguide

Cited by 9 publications

References 43 publications

Optimally designed tunable phase change material-based narrowband perfect absorber

Optimally designed tunable phase change material-based narrowband perfect absorber

On-Chip Integrated Photonic Devices Based on Phase Change Materials

Recent developments in Chalcogenide phase change material-based nanophotonics

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