Enhanced thermo-optic nonlinearities in a MoS₂-on-silicon microring resonator

Abstract

We experimentally investigated the thermal nonlinearity in a MoS2-on-silicon microring resonator. In the hybrid MoS2-on-silicon microring resonator, there was a threefold increase in the resonance shift rate as input optical power increased. The effective photothermal coefficient of the MoS2-on-silicon resonator was enhanced to 4.7 × 10−15 m2 W−1. The enhancement can be attributed to the presence of defect states of the MoS2 film, leading to additional absorption of light and enhanced heating, which changed the effective refractive index of the resonator. Efficient thermal bistability was observed in the resonator.

Thermo-optic refraction in MoS2 medium for “Normally on” all optical switch

“…Further, this heat gets absorbed by the neighboring solvent molecules causing large refractive index gradient. Thermo-optic coefficient(dn/dT) of nano layer MoS2 is reported as ~10 -5 K -1 [23,24] . Whereas of common solvent(ethanol) is ~-10 -4 K -1 [25].…”

Two‐Dimensional Materials for Integrated Photonics: Recent Advances and Future Challenges

“…Fourth, the strong optical response of 2DMs is another advantage. [105][106][107][108] Till now, nonlinear phenomena of 2DMs including ultrafast nonlinear absorption, [109][110][111] thermo-optic (TO) nonlinearities, [112] second-harmonic generation (SHG), [113][114][115] and third-order nonlinear optical response [116,117] have been observed, which are important for next-generation nonlinear photonic circuits. Fifth, quantum emitters based on 2DMs, [118] moire excitons in van der Waals' heterojunctions of 2DMs, [119,120] and gate-tunable frequency combs based on graphene/Si 3 N 4 microresonator [77] have been realized, which bring about a new possibility for quantum optics.…”

Enhancing light‐matter interaction in 2D materials by optical micro/nano architectures for high‐performance optoelectronic devices

“…2,4 As a result, atomically thinlayered 2D materials can be integrated with many other materials and structures. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] However, because of their 2D nature, the light-matter interaction length in 2D materials is much shorter than that in the bulk counterparts, which inherently limits the performance of the devices that use 2D active materials.…”

“…Third, conventional lattice matching is not required in van der Waals heterostructures composed of 2D materials while excellent electronic transport properties remain at the interface 2,4 . As a result, atomically thin‐layered 2D materials can be integrated with many other materials and structures 23‐38 . However, because of their 2D nature, the light‐matter interaction length in 2D materials is much shorter than that in the bulk counterparts, which inherently limits the performance of the devices that use 2D active materials.…”