Search

In this paper, we design a multifunctional micro-nano device with a hybrid metamaterial-waveguide system, which leads to a triple plasmon-induced transparency (PIT). The formation mechanisms of the three transparent peaks have their own unique characteristics. First, PIT-I can be switched into the BIC (Friedrich–Wintge bound state in continuum), and the quality factors (Q-factors) of the transparency window of PIT-I are increased during the process. Second, PIT-II comes from near-field coupling between two bright modes. Third, PIT-III is generated by the near-field coupling between a low-Q broadband bright mode and a high-Q narrowband guide mode, which also has a high-Q transparent window due to the guide mode. The triple-PIT described above can be dynamically tuned by the gate voltage of the graphene, particularly for the dynamic tuning of the Q values of PIT-I and PIT-III. Based on the high Q value of the transparent window, our proposed structure can be used for highly sensitive refractive index sensors or devices with prominent slow light effects. [ABSTRACT FROM AUTHOR]

As a plasmonic analogue of electromagnetically induced transparency (EIT), plasmon-induced transparency (PIT) has drawn more attention due to its potential of realizing on-chip sensing, slow light and nonlinear effect enhancement. However, the performance of a plasmonic system is always limited by the metal ohmic loss. Here, we numerically report a PIT system with gain materials based on plasmonic metal-insulator-metal waveguide. The corresponding phenomenon can be theoretically analyzed by coupled mode theory (CMT). After filling gain material into a disk cavity, the system intrinsic loss can be compensated by external pump beam, and the PIT can be greatly fueled to achieve a dramatic enhancement of slow light performance. Finally, a double-channel enhanced slow light is introduced by adding a second gain disk cavity. This work paves way for a potential new high-performance slow light device, which can have significant applications for high-compact plasmonic circuits and optical communication. [ABSTRACT FROM AUTHOR]

Abstract We numerically and theoretically investigate a metal-insulator-metal (MIM) system based on aperture-coupled cascade resonators without gap to achieve plasmon-induced transparency (PIT). Such structure not only can be fabricated easily, but also possesses low intrinsic loss. Consequently, a high transmitted PIT peak more than 90% can be achieved, and this device also has good performance on sensing and slow light. Finally, multi-channel PIT and slow light can be achieved via cascade multiple resonators. This work provides a valuable approach to realize on-chip PIT in practical experiments. Highlights • Plasmon-induced transparency (PIT) is realized based on a metal-insulator-metal (MIM) system without the gap structure. • Such system can be fabricated easily by the state of art. • Such system possesses low intrinsic loss, simultaneously has a good performance on slow light. • Multi-channel PIT and slow light can be achieved via cascade multiple resonators. [ABSTRACT FROM AUTHOR]

As a plasmonic analogue of electromagnetically induced transparency (EIT), plasmon-induced transparency (PIT) has been widely studied duo to the excellent performance on sensing, slow light and enhancing nonlinear effects, which has great potential to be applied on compact optical communication system. Here, we introduce an all-optical PIT multi-channel switching based on the metal–insulator–metal (MIM) plasmonic waveguide device with small footprint. Single/double PIT is investigated both theoretically and numerically by multi-oscillator theory (MOT) and finite-difference time-domain (FDTD), and utilizing the nonlinear medium filled in the cavity, the PIT can be dynamically tunable to achieve various kinds of single/multi-channel switching for telecommunication wavelengths. Besides, utilizing the unprecedented high Kerr coefficient of graphene, the low-power and ultrafast all-optical switching can be made possible. This work provides a novel scheme to realize all-optical switching based on PIT, which can promote on-chip ultrafast optical communication and signal processing. [ABSTRACT FROM AUTHOR]