Opt Lett. 2023 Jan 15;48(2):391-394. doi: 10.1364/OL.477267.
Optical waveguide amplifiers are essential devices in integrated optical systems. Their gain bandwidths directly determine the operating wavelength of optical circuits. Due to the difficulty of developing wideband gain media, it has been a challenge to fabricate devices with broadband amplification capability, resulting in few reports on multi-band polymer waveguide amplifiers. Here, a polymer waveguide amplifier is demonstrated, which achieves loss compensation covering the whole (S + C) band by using NaYF:Tm,Yb@NaYF@NaYF:Er nanoparticles (NPs)-doped SU-8 as the gain medium. The NPs with a layer-doped core-multishell structure not only provided two emitters required for (S + C)-band amplification, but also reduced the energy transfer (ET) between them. Under 980-nm excitation, the full width at half maximum (FWHM) of the emission peak of NPs reached 119 nm, and the relative gain in the (S + C) band was about 6-8 dB, successfully expanding the operating wavelength from single-band to multi-band.
光波导放大器是集成光学系统中的重要器件。它们的增益带宽直接决定了光电路的工作波长。由于开发宽带增益介质的困难，制造具有宽带放大能力的器件一直是一个挑战，因此很少有关于多波段聚合物波导放大器的报道。在这里，我们演示了一种聚合物波导放大器，它使用掺杂有 NaYF:Tm,Yb@NaYF@NaYF:Er 纳米粒子（NPs）的 SU-8 作为增益介质，实现了涵盖整个（S+C）波段的损耗补偿。具有层掺杂核壳结构的 NPs 不仅提供了（S+C）波段放大所需的两个发射器，而且还减少了它们之间的能量转移（ET）。在 980nm 激发下，NPs 的发射峰的半峰全宽（FWHM）达到 119nm，在（S+C）波段的相对增益约为 6-8dB，成功地将工作波长从单波段扩展到多波段。
