Silicon-nitride photonic circuits interfaced with monolayer MoS2

Wei, Guohua; Stanev, Teodor K.; Czaplewski, David A.; Jung, Il Woong; Stern, Nathaniel P.

doi:10.1063/1.4929779

Cited by 41 publications

(38 citation statements)

References 30 publications

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“…3(a)], we assume that the intrinsic loss (composed of scattering loss, material absorption loss, and bending loss) of the microrings remains unchanged after the GST deposition and RTA. The loss introduced by GST can then be estimated as the difference in the loss of the microring before and after GST deposition [38]:…”

Section: Resultsmentioning

confidence: 99%

GST-on-silicon hybrid nanophotonic integrated circuits: a non-volatile quasi-continuously reprogrammable platform

Zheng

Khanolkar

et al. 2018

Opt. Mater. Express

193

160

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Reconfiguration of silicon photonic integrated circuits relying on the weak, volatile thermo-optic or electro-optic effect of silicon usually suffers from a large footprint and energy consumption. Here, integrating a phase-change material, Ge 2 Sb 2 Te 5 (GST) with silicon microring resonators, we demonstrate an energy-efficient, compact, non-volatile, reprogrammable platform. By adjusting the energy and number of free-space laser pulses applied to the GST, we characterize the strong broadband attenuation and optical phase modulation effects of the platform, and perform quasi-continuous tuning enabled by thermooptically-induced phase changes. As a result, a non-volatile optical switch with a high extinction ratio, as large as 33 dB, is demonstrated.

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Section: Resultsmentioning

confidence: 99%

GST-on-silicon hybrid nanophotonic integrated circuits: a non-volatile quasi-continuously reprogrammable platform

Zheng

Khanolkar

et al. 2018

Opt. Mater. Express

193

160

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show abstract

“…ML MoS 2 flakes are obtained from a bulk crystal (SPI Supplies) using mechanical exfoliation. The flakes are dry transferred onto a SiO 2 /Si substrate with pre-written alignment marks 61 . Identification of ML MoS 2 is done using atomic force microscopy (AFM), optical contrast, and PL spectroscopy following documented procedures 61 .…”

Section: Methodsmentioning

confidence: 99%

“…The flakes are dry transferred onto a SiO 2 /Si substrate with pre-written alignment marks 61 . Identification of ML MoS 2 is done using atomic force microscopy (AFM), optical contrast, and PL spectroscopy following documented procedures 61 . Samples are annealed in an Ar/H 2 environment at 400 ºC before patterning with electron beam lithography and reactive ion etching using CHF 3 /O 2 gas.…”

Section: Methodsmentioning

confidence: 99%

Size-tunable Lateral Confinement in Monolayer Semiconductors

Wei

Czaplewski

Lenferink

et al. 2017

Sci Rep

Self Cite

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Three-dimensional confinement allows semiconductor quantum dots to exhibit size-tunable electronic and optical properties that enable a wide range of opto-electronic applications from displays, solar cells and bio-medical imaging to single-electron devices. Additional modalities such as spin and valley properties in monolayer transition metal dichalcogenides provide further degrees of freedom requisite for information processing and spintronics. In nanostructures, however, spatial confinement can cause hybridization that inhibits the robustness of these emergent properties. Here, we show that laterally-confined excitons in monolayer MoS2 nanodots can be created through top-down nanopatterning with controlled size tunability. Unlike chemically-exfoliated monolayer nanoparticles, the lithographically patterned monolayer semiconductor nanodots down to a radius of 15 nm exhibit the same valley polarization as in a continuous monolayer sheet. The inherited bulk spin and valley properties, the size dependence of excitonic energies, and the ability to fabricate MoS2 nanostructures using semiconductor-compatible processing suggest that monolayer semiconductor nanodots have potential to be multimodal building blocks of integrated optoelectronics and spintronics systems.

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“…However, the metal has thermal instability in visible region due to large ohmic loss. The Fabry-perot (F-P) cavity constructed by Bragg reflector can realize strong coupling but the integration is difficult and the volume of whispering gallery modes is large, both of which are difficult to be applied in reality [19][20][21][22][23] . Recently, the guided resonance coupled with WS 2 24 , two-dimensional dielectric photonic crystal slab with WS 2 have been successfully reported to achieve strong coupling between dielectric and excitons 25 .…”

Section: Introductionmentioning

confidence: 99%

Strong coupling between excitons and magnetic dipole quasi-bound states in the continuum in WS$_2$-TiO$_2$ hybrid metasurfaces

Qin,

Xiao,

Liu

et al. 2021

Preprint

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Enhancing the light-matter interactions in two-dimensional materials via optical metasurfaces has attracted much attention due to its potential to enable breakthrough in advanced compact photonic and quantum information devices. Here, we theoretically investigate a strong coupling between excitons in monolayer WS2 and quasi-bound states in the continuum (quasi-BIC). In the hybrid structure composed of WS2 coupled with asymmetric titanium dioxide nanobars, a remarkable spectral splitting and typical anticrossing behavior of the Rabi splitting can be observed, and such strong coupling effect can be modulated by shaping the thickness and asymmetry parameter of the proposed metasurfaces. It is found that the balance of line width of the quasi-BIC mode and local electric field enhancement should be considered since both of them affect the strong coupling, which is crucial to the design and optimization of metasurface devices. This work provides a promising way for controlling the light-matter interactions in strong coupling regime and opens the door for the future novel quantum, low-energy, distinctive nanodevices by advanced meta-optical engineering.

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Silicon-nitride photonic circuits interfaced with monolayer MoS2

Cited by 41 publications

References 30 publications

GST-on-silicon hybrid nanophotonic integrated circuits: a non-volatile quasi-continuously reprogrammable platform

GST-on-silicon hybrid nanophotonic integrated circuits: a non-volatile quasi-continuously reprogrammable platform

Size-tunable Lateral Confinement in Monolayer Semiconductors

Strong coupling between excitons and magnetic dipole quasi-bound states in the continuum in WS$_2$-TiO$_2$ hybrid metasurfaces

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