Degl'Innocenti R, Montinaro M, Xu J, Piazza V, Pingue P, Tredicucci A, Beltram F, Beere H E, Ritchie D A
NEST, CNR-INFM and Scuola Normale Superiore, Piazza San Silvestro 12, I-56127 Pisa, Italy.
Opt Express. 2009 Dec 21;17(26):23785-92. doi: 10.1364/OE.17.023785.
We have realized a differential Near-field Scanning Optical Microscope (NSOM) working with subwavelength resolution in the THz spectral region. The system employs a quantum cascade laser emitting at lambda approximately 105 microm as source, and the method, differently from conventional NSOM, involves diffracting apertures with size comparable to the wavelength. This concept ensures a higher signal-to-noise level at the expense of an additional computational step. In the implementation here reported lambda/10 resolution has been achieved; present limiting factors are investigated through finite difference time domain simulations.
我们已经实现了一种在太赫兹光谱区域具有亚波长分辨率的差分近场扫描光学显微镜（NSOM）。该系统采用波长约为105微米的量子级联激光器作为光源，并且与传统的NSOM不同，该方法涉及使用尺寸与波长相当的衍射孔径。这一概念以增加一个计算步骤为代价确保了更高的信噪比。在本文报道的实现中，已经实现了λ/10的分辨率；通过时域有限差分模拟研究了当前的限制因素。
