Coherent Multiphoton Control of Gallium Phosphide Nanodisk Resonances
Coherent Multiphoton Control of Gallium Phosphide Nanodisk Resonances
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DOI：
10.1021/acsphotonics.9b00780
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发表时间：
2019-10-01
期刊：
影响因子：
7
通讯作者：
van Hulst, Niek F.
中科院分区：
文献类型：
--
作者：
Remesh, Vikas;Grinblat, Gustavo;van Hulst, Niek F.
高折射率介电纳米天线最近出现了有前途的替代等离子体纳米天线集中和操纵光在纳米尺度。例如，磷化镓（GaP）纳米天线在可见光范围内显示出极低的损耗和高非线性，支持电和磁共振，并且与CMOS制造技术很好地兼容。特别是，低损耗和大的非线性是有希望的超快光开关和真正的全光控制的GaP纳米器件。在这里，首先，我们使用两个和三个光子激发的GaP纳米盘探测二次谐波和带隙发射的尺寸依赖的共振增强。接下来，我们表明，通过宽带脉冲激发的光谱相位控制，GaP纳米天线在支持非线性光学相干性方面优于金属纳米天线。
High-index dielectric nanoantennas have recently emerged as promising alternatives to plasmonic nanoantennas for concentrating and manipulating light at the nanoscale. For example, gallium phosphide (GaP) nanoantennas display extremely low losses in the visible range and high nonlinearities, support both electric and magnetic resonances, and are nicely compatible with CMOS fabrication technology. Especially, the low losses and large nonlinearities are promising for ultrafast optical switching and truly all-optical control of GaP nanodevices. Here first we use two- and three-photon excitation of GaP nanodisks to probe the size-dependent resonance enhancement of second-harmonic and bandgap emission. Next, we show, by spectral phase control of broadband pulsed excitation, that GaP nanoantennas outperform their metal counterparts in supporting nonlinear optical coherences.