Hwang Jehwan, Ku Zahyun, Jeon Jiyeon, Kim Yeongho, Kim Jun Oh, Kim Deok-Kee, Urbas Augustine, Kim Eun Kyu, Lee Sang Jun
Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Korea.
Department of Physics and Research Institute for Convergence of Basic Sciences, Hanyang University, Seoul 04763, Korea.
Nanomaterials (Basel). 2020 Sep 13;10(9):1827. doi: 10.3390/nano10091827.
The algorithmic spectrometry as an alternative to traditional approaches has the potential to become the next generation of infrared (IR) spectral sensing technology, which is free of physical optical filters, and only a very small number of data are required from the IR detector. A key requirement is that the detector spectral responses must be engineered to create an optimal basis that efficiently synthesizes spectral information. Light manipulation through metal perforated with a two-dimensional square array of subwavelength holes provides remarkable opportunities to harness the detector response in a way that is incorporated into the detector. Instead of previous experimental efforts mainly focusing on the change over the resonance wavelength by tuning the geometrical parameters of the plasmonic layer, we experimentally and numerically demonstrate the capability for the control over the shape of bias-tunable response spectra using a fixed plasmonic structure as well as the detector sensitivity improvement, which is enabled by the anisotropic dielectric constants of the quantum dots-in-a-well (DWELL) absorber and the presence of electric field along the growth direction. Our work will pave the way for the development of an intelligent IR detector, which is capable of direct viewing of spectral information without utilizing any intervening the spectral filters.
作为传统方法的替代方案，算法光谱法有潜力成为下一代红外（IR）光谱传感技术，该技术无需物理光学滤波器，且红外探测器仅需极少量数据。一个关键要求是，必须对探测器光谱响应进行设计，以创建一个能有效合成光谱信息的最佳基。通过带有二维方形亚波长孔阵列的金属进行光操纵，为以一种整合到探测器中的方式利用探测器响应提供了显著机会。以往的实验工作主要集中在通过调整等离子体层的几何参数来改变共振波长，而我们通过实验和数值模拟证明，使用固定的等离子体结构能够控制偏置可调响应光谱的形状，同时还能提高探测器灵敏度，这是由阱中量子点（DWELL）吸收体的各向异性介电常数以及沿生长方向的电场的存在所实现的。我们的工作将为智能红外探测器的发展铺平道路，这种探测器能够在不使用任何中间光谱滤波器的情况下直接查看光谱信息。
