Kim Geon Yeong, Kim Shinho, Park Ki Hyun, Jang Hanhwi, Kim Moohyun, Nam Tae Won, Song Kyeong Min, Shin Hongjoo, Park Yemin, Cho Yeongin, Yeom Jihyeon, Choi Min-Jae, Jang Min Seok, Jung Yeon Sik
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea.
School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea.
Nat Commun. 2024 Aug 14;15(1):6996. doi: 10.1038/s41467-024-51179-y.
Three-dimensional optical nanostructures have garnered significant interest in photonics due to their extraordinary capabilities to manipulate the amplitude, phase, and polarization states of light. However, achieving complex three-dimensional optical nanostructures with bottom-up fabrication has remained challenging, despite its nanoscale precision and cost-effectiveness, mainly due to inherent limitations in structural controllability. Here, we report the optical characteristics of intricate two- and three-dimensional nanoarchitectures made of colloidal quantum dots fabricated with multi-dimensional transfer printing. Our customizable fabrication platform, directed by tailored interface polarity, enables flexible geometric control over a variety of one-, two-, and three-dimensional quantum dot architectures, achieving tunable and advanced optical features. For example, we demonstrate a two-dimensional quantum dot nanomesh with tuned subwavelength square perforations designed by finite-difference time-domain calculations, achieving an 8-fold enhanced photoluminescence due to the maximized optical resonance. Furthermore, a three-dimensional quantum dot chiral structure is also created via asymmetric stacking of one-dimensional quantum dot layers, realizing a pronounced circular dichroism intensity exceeding 20°.
三维光学纳米结构因其在操纵光的振幅、相位和偏振态方面的非凡能力而在光子学领域引起了极大的关注。然而，尽管自下而上制造具有纳米级精度和成本效益，但实现复杂的三维光学纳米结构仍然具有挑战性，主要是由于结构可控性存在固有局限性。在此，我们报告了通过多维转移印刷制造的由胶体量子点制成的复杂二维和三维纳米结构的光学特性。我们的可定制制造平台由定制的界面极性引导，能够对各种一维、二维和三维量子点结构进行灵活的几何控制，实现可调谐和先进的光学特性。例如，我们展示了一种二维量子点纳米网，其具有通过有限时域差分计算设计的可调谐亚波长方形穿孔，由于光学共振最大化，实现了8倍的光致发光增强。此外，还通过一维量子点层的不对称堆叠创建了三维量子点手性结构，实现了超过20°的明显圆二色性强度。
