Whisper Gallery Modes in Monolayer Tungsten Disulfide-Hexagonal Boron Nitride Optical Cavity,ACS Photonics

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Whisper Gallery Modes in Monolayer Tungsten Disulfide-Hexagonal Boron Nitride Optical Cavity
ACS Photonics ( IF 6.5 ) Pub Date : 2017-11-28 00:00:00 , DOI: 10.1021/acsphotonics.7b01245
Tianhua Ren ₁ , Peng Song ₁ , Jianyi Chen ₁ , Kian Ping Loh ₁

Affiliation

There are strong interests in constructing nanolasers using two-dimensional transition metal dichalcogenides (TMDs) due to their strong light–matter interactions and high optical gain. However, most cavity designs based on transfer of exfoliated TMDs on silicon oxide are not optimized since monolayer emitters are located far from where the photonic mode reaches maximum intensity. By taking advantage of the excellent dielectric properties of hexagonal boron nitride (h-BN), we design a new microdisk optical cavity fabricated from a van der Waals (VdW) stacked h-BN/WS₂/h-BN. The heterostructure is patterned into microdisk cavities characterized by whispering gallery modes (WGMs). The emission intensity of the WS₂ trion is enhanced by 2.9 times that of exciton in the heterostructure, giving rise to whisper gallery modes with resonance intensities that show nonlinear power dependence. A Rayleigh scatterer directs the cavity emission to vertical collection. Such VdW heterostructure provides an atomically smooth interface that is ideal for low loss photon propagation, giving a Q factor of 1200.

中文翻译：

单层二硫化钨-六方氮化硼光学腔中的耳语画廊模式

人们对使用二维过渡金属二卤化物（TMD）构造纳米激光有着浓厚的兴趣，因为它们具有很强的光-物质相互作用和高光学增益。然而，由于单层发射器的位置离光子模式达到最大强度的位置很远，因此大多数基于剥落的TMD在氧化硅上转移的腔设计并未得到优化。通过利用六方氮化硼（h-BN）的优异介电性能，我们设计了一种由范德华（VdW）堆叠的h-BN / WS ₂ / h-BN制成的新型微盘光学腔。异质结构被图案化为以回音壁模式（WGM）为特征的微盘腔。WS ₂的发射强度Trion在异质结构中的激子强度提高了2.9倍，从而产生了带有共振强度的耳语画廊模式，共振强度表明了非线性功率依赖性。瑞利散射器将腔体发射定向为垂直收集。这样的VdW异质结构提供了原子上光滑的界面，是低损耗光子传播的理想选择，Q值为1200。

更新日期：2017-11-28

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