Ex) Article Title, Author, Keywords
Current Optics
and Photonics
Ex) Article Title, Author, Keywords
Curr. Opt. Photon. 2022; 6(5): 497-505
Published online October 25, 2022 https://doi.org/10.3807/COPP.2022.6.5.497
Copyright © Optical Society of Korea.
Na Ma, Ping Jiang , You Tao Zeng, Xiao Zhen Qiao, Xian Feng Xu
Corresponding author: *pjiang@upc.edu.cn, ORCID 0000-0002-1128-8818
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Topological photonic nanocavities are considered to possess outstanding optical performance, and provide new platforms for realizing strong interaction between light and matter, due to their robustness to impurities and defects. Here hybrid plasmonic topological photonic nanocavities are proposed, by embedding various plasmon nanoantennas such as gold nanospheres, cylinders, and rectangles in a topological photonic crystal corner-state nanocavity. The maximum quality factor
Keywords: Cavity quantum electrodynamics, Plasmon nanoantennas, Purcell enhancement, Topological photonic nanocavity, Topological protection
OCIS codes: (230.5298) Photonic crystals; (350.4238) Nanophotonics and photonic crystals; (350.5400) Plasmas
Cavity quantum electrodynamics (CQED) has wide range of applications for the realization of quantum information processing (QIP) [1, 2]. In the weak-coupling region, the spontaneous emission rate of quantum emitters can be dramatically improved based on the Purcell effect, which can be used to optimize the performance of a single-photon source [3–5]. A wide range of nanocavities has been used to establish solid-state CQED systems, including the whispering-gallery cavity [6, 7] and the photonic crystal (PhC) cavity [8–10]. To enhance the coupling efficiency, these nanocavities have to be optimized to have high a quality factor
Recently, topological protection has been used in photonic devices, providing a new way to develop photonic devices with robustness to defects and disorders [14–16]. The topological concept also offers a different approach for designing PhC nanocavities [17–20]. An effective approach for constructing a topological nanocavity is the so-called photonic crystal corner-state nanocavity, utilizing a topological corner state that appears as a higher-order topological state in a two-dimensional (2D) system [21, 22]. However, if improving Purcell enhancement only depends on edge states, the emission rate is not high enough [23]. By embedding a plasmonic antenna in the topological photonic nanocavity, the performance of the cavity will be dramatically improved. Zhang
We firstly consider the bare topological corner-state nanocavity, which is composed of two topologically distinct PhC structures with square-shaped air holes. These two structures possess an identical square lattice with lattice constant
Although the corner state cavity has an excellent ability to concentrate much of the light field, there is still a large amount of light scattered into the upper- and right-side waveguides, as well as the interior of the PhCs, resulting in a relatively large mode volume, as shown in Fig. 1(a). To obtain a high-performance optical nanocavity with ultralarge
Different positions of the Au nanospheres relative to the cavity potentially exert different influence on the characteristics of the hybrid nanocavity. Here, we mainly consider two different structures, as shown in Figs. 1(b) and 1(c). The direction of the two nanospheres is aligned parallel or perpendicular to the direction of maximum electric field strength, denoted as Type A and Type B respectively. The electric field intensity distribution |
To further study the influence of different positions of the Au nanospheres on the hybrid nanocavities, we quantitatively characterize the optical properties of the hybrid nanocavities by calculating the quality factor
We next investigate the influence of the gap width between the two gold nanospheres on the optical properties of the hybrid nanocavity. When gradually increasing the gap width,
Apart from the Au nanospheres, other Au nanoantennas can also remarkably decrease the mode volume to improve the localization of the light field. In the following, different gold structures such as cylinders and rectangles are considered and the optical properties of diverse hybrid nanocavities are intensively investigated, as shown in Figs. 4(a) and 4(b). The electronic field strength profiles of various structures are calculated and mapped in Figs. 4(c) and 4(d). Most of the electromagnetic energy is confined inside the gap between these two Au nanoparticles to form a pronounced hot spot. Moreover, the electric field strength of the topological hybrid nanocavities with cylinder antennas is enhanced by a factor of 4.13, compared to the bare cavity. The presence of the rectangular antenna structure may weaken the electronic field strength to some extent, owing to the intense metal loss that is induced. As a consequence, using plasmonic nanoantennas with metal nanospheres and cylinders is easier for strengthening the light-matter interaction via enhanced electric field distribution.
The quality factor
The gap between these gold structures plays a crucial role in tuning the optical properties of the hybrid nanocavity. When the gap increases, it is seen in Fig. 6(a) that the quality factor
In conclusion, a topological corner-state nanocavity with ultrahigh quality factor
The authors declare no conflict of interest.
Data underlying the results presented in this paper are not publicly available at the time of publication, but may be obtained from the authors upon reasonable request.
Central University Basic Research Fund (22CX03018A); Graduate Innovation Engineering Project (YCX2021145).
Curr. Opt. Photon. 2022; 6(5): 497-505
Published online October 25, 2022 https://doi.org/10.3807/COPP.2022.6.5.497
Copyright © Optical Society of Korea.
Na Ma, Ping Jiang , You Tao Zeng, Xiao Zhen Qiao, Xian Feng Xu
College of Science, China University of Petroleum (East China), Qingdao 266580, China
Correspondence to:*pjiang@upc.edu.cn, ORCID 0000-0002-1128-8818
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Topological photonic nanocavities are considered to possess outstanding optical performance, and provide new platforms for realizing strong interaction between light and matter, due to their robustness to impurities and defects. Here hybrid plasmonic topological photonic nanocavities are proposed, by embedding various plasmon nanoantennas such as gold nanospheres, cylinders, and rectangles in a topological photonic crystal corner-state nanocavity. The maximum quality factor
Keywords: Cavity quantum electrodynamics, Plasmon nanoantennas, Purcell enhancement, Topological photonic nanocavity, Topological protection
Cavity quantum electrodynamics (CQED) has wide range of applications for the realization of quantum information processing (QIP) [1, 2]. In the weak-coupling region, the spontaneous emission rate of quantum emitters can be dramatically improved based on the Purcell effect, which can be used to optimize the performance of a single-photon source [3–5]. A wide range of nanocavities has been used to establish solid-state CQED systems, including the whispering-gallery cavity [6, 7] and the photonic crystal (PhC) cavity [8–10]. To enhance the coupling efficiency, these nanocavities have to be optimized to have high a quality factor
Recently, topological protection has been used in photonic devices, providing a new way to develop photonic devices with robustness to defects and disorders [14–16]. The topological concept also offers a different approach for designing PhC nanocavities [17–20]. An effective approach for constructing a topological nanocavity is the so-called photonic crystal corner-state nanocavity, utilizing a topological corner state that appears as a higher-order topological state in a two-dimensional (2D) system [21, 22]. However, if improving Purcell enhancement only depends on edge states, the emission rate is not high enough [23]. By embedding a plasmonic antenna in the topological photonic nanocavity, the performance of the cavity will be dramatically improved. Zhang
We firstly consider the bare topological corner-state nanocavity, which is composed of two topologically distinct PhC structures with square-shaped air holes. These two structures possess an identical square lattice with lattice constant
Although the corner state cavity has an excellent ability to concentrate much of the light field, there is still a large amount of light scattered into the upper- and right-side waveguides, as well as the interior of the PhCs, resulting in a relatively large mode volume, as shown in Fig. 1(a). To obtain a high-performance optical nanocavity with ultralarge
Different positions of the Au nanospheres relative to the cavity potentially exert different influence on the characteristics of the hybrid nanocavity. Here, we mainly consider two different structures, as shown in Figs. 1(b) and 1(c). The direction of the two nanospheres is aligned parallel or perpendicular to the direction of maximum electric field strength, denoted as Type A and Type B respectively. The electric field intensity distribution |
To further study the influence of different positions of the Au nanospheres on the hybrid nanocavities, we quantitatively characterize the optical properties of the hybrid nanocavities by calculating the quality factor
We next investigate the influence of the gap width between the two gold nanospheres on the optical properties of the hybrid nanocavity. When gradually increasing the gap width,
Apart from the Au nanospheres, other Au nanoantennas can also remarkably decrease the mode volume to improve the localization of the light field. In the following, different gold structures such as cylinders and rectangles are considered and the optical properties of diverse hybrid nanocavities are intensively investigated, as shown in Figs. 4(a) and 4(b). The electronic field strength profiles of various structures are calculated and mapped in Figs. 4(c) and 4(d). Most of the electromagnetic energy is confined inside the gap between these two Au nanoparticles to form a pronounced hot spot. Moreover, the electric field strength of the topological hybrid nanocavities with cylinder antennas is enhanced by a factor of 4.13, compared to the bare cavity. The presence of the rectangular antenna structure may weaken the electronic field strength to some extent, owing to the intense metal loss that is induced. As a consequence, using plasmonic nanoantennas with metal nanospheres and cylinders is easier for strengthening the light-matter interaction via enhanced electric field distribution.
The quality factor
The gap between these gold structures plays a crucial role in tuning the optical properties of the hybrid nanocavity. When the gap increases, it is seen in Fig. 6(a) that the quality factor
In conclusion, a topological corner-state nanocavity with ultrahigh quality factor
The authors declare no conflict of interest.
Data underlying the results presented in this paper are not publicly available at the time of publication, but may be obtained from the authors upon reasonable request.
Central University Basic Research Fund (22CX03018A); Graduate Innovation Engineering Project (YCX2021145).