支持从紫外到近红外的准回音壁模式的III族氮化物可调谐杯形腔
III-nitride tunable cup-cavities supporting quasi whispering gallery modes from ultraviolet to near infrared
摘要：
快速发展的纳米光子学需要由芯片兼容技术形成的不同光谱范围的微谐振器。此外，可调的需求最大。在这里，我们提出了外延现场控制III-氮化物杯腔，可以从紫外到近红外，支持准回音壁模式到室温。在这些腔中，吸收边附近的折射率变化引起模式切换的显著效果，这是伴随着空间强度分布的变化，光有效地集中到亚波长体积，和太赫兹光子的发射。在离边缘一定距离处，模式相关的窄发射线在不同温度下具有稳定的能量和宽度。此外，它们的能量在大的“成熟”单晶腔中是相同的。我们的研究结果揭示了半导体腔中的模式行为，并为单生长运行制造包括有源区和具有可调谐模式频率的腔的器件开辟了道路。
英文摘要：
Rapidly developing nanophotonics needs microresonators for different spectral ranges, formed by chip-compatible technologies. In addition, the tunable ones are in greatest demand. Here, we present epitaxial site--controlled III--nitride cup--cavities which can operate from ultraviolet to near--infrared, supporting quasi whispering gallery modes up to room temperature. In these cavities, the refractive index variation near an absorption edge causes the remarkable effect of mode switching, which is accompanied by the change of spatial intensity distribution, concentration of light efficiently into a subwavelength volume, and emission of terahertz photons. At a distance from the edge, the mode-related narrow emission lines have stable energies and widths at different temperatures. Moreover, their energies are identical in the large 'ripened' monocrystal cavities. Our results shed light on the mode behavior in the semiconductor cavities and open the way for single--growth--run manufacturing the devices comprising an active region and a cavity with tunable mode frequencies.
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