Choi Kyu-Ri, Li Shilong, Park Dong Hee, Joo Bin Chan, Lee Hojun, Kang Evan S H, Nic Chormaic Síle, Wu Jeong Weon, D'Aléo Anthony, Lee Yeon Ui
Chungbuk National University, Cheongju, Republic of Korea.
Okinawa Institure of Science and Technology Graduate University, Onna, Japan.
Nanophotonics. 2024 Jan 8;13(7):1033-1037. doi: 10.1515/nanoph-2023-0631. eCollection 2024 Mar.
Manipulating the spontaneous emission rate of fluorophores is vital in creating bright incoherent illumination for optical sensing and imaging, as well as fast single-photon sources for quantum technology applications. This can be done via increasing the Purcell effect by using non-monolithic optical nanocavities; however, achieving the desired performance is challenging due to difficulties in fabrication, precise positioning, and frequency tuning of cavity-emitter coupling. Here, we demonstrate a simple approach to achieve a wavelength-dependent photoluminescence (PL) lifetime modification using monolithic organic molecular aggregates films. These single monolithic organic films are designed to have a Lorentzian dispersion, including epsilon-near-zero (ENZ) and epsilon-near-pole (ENP) spectral regions with increased and decreased photonic density of states, respectively. This dispersion leads to enhanced and depressed PL decay rates at different wavelengths. Both time-resolved photoluminescence (TRPL) and fluorescence lifetime imaging microscopy (FLIM) measurements are implemented to verify the validity of this approach. This approach offers a promising way to design dual-functional optical sources for a variety of applications, including bioimaging, sensing, data communications, and quantum photonics applications.
操控荧光团的自发发射速率对于为光学传感和成像创建明亮的非相干照明以及为量子技术应用创建快速单光子源至关重要。这可以通过使用非单片光学纳米腔来增强珀塞尔效应来实现；然而，由于腔-发射体耦合在制造、精确定位和频率调谐方面存在困难，实现所需性能具有挑战性。在这里，我们展示了一种使用单片有机分子聚集体薄膜实现波长依赖的光致发光（PL）寿命修改的简单方法。这些单一的单片有机薄膜被设计成具有洛伦兹色散，包括分别具有增加和降低的光子态密度的近零介电常数（ENZ）和近极点介电常数（ENP）光谱区域。这种色散导致在不同波长处PL衰减率增强和降低。实施了时间分辨光致发光（TRPL）和荧光寿命成像显微镜（FLIM）测量以验证该方法的有效性。这种方法为设计用于各种应用的双功能光源提供了一种有前途的方法，包括生物成像、传感、数据通信和量子光子学应用。
