Abstract

We demonstrate a higher sensitivity detection of proteins in a photonic crystal platform by including a deep subwavelength feature in the unit cell that locally increases the energy density of light. Through both simulations and experiments, the sensing capability of a deep subwavelength-engineered silicon antislot photonic crystal nanobeam (PhCNB) cavity is compared to that of a traditional PhCNB cavity. The redistribution and local enhancement of the energy density by the 50 nm antislot enable stronger light–molecule interaction at the surface of the antislot and lead to a larger resonance shift upon protein binding. This surface-based energy enhancement is confirmed by experiments demonstrating a nearly 50% larger resonance shift upon attachment of streptavidin molecules to biotin-functionalized antislot PhCNB cavities.

© 2024 Optica Publishing Group

Specific detection of proteins using photonic crystal waveguides

S. C. Buswell, V. A. Wright, J. M. Buriak, V. Van, and S. Evoy
Opt. Express 16(20) 15949-15957 (2008)

Topological corner state localized bound states in continuum in photonic crystals

Zhenbin Zhang, Banxian Ruan, Enduo Gao, Chao Liu, and Hongjian Li
Opt. Lett. 49(7) 1782-1785 (2024)

Topological corner states in a silicon nitride photonic crystal membrane with a large bandgap

Yiying Liu, Xing Hong, Shouqi Zhang, Jixin Li, Song Han, Jin Tao, and Yongquan Zeng
Opt. Lett. 49(2) 242-245 (2024)

Subwavelength resolution using the near field of quantum emitters

Aziz Kolkıran
Opt. Lett. 49(7) 1676-1679 (2024)

Tunable Fabry–Perot interferometer operated in the terahertz range based on an effective refractive index control using pitch-variable subwavelength gratings

Ying Huang, Yangxun Liu, Taiyu Okatani, Naoki Inomata, and Yoshiaki Kanamori
Opt. Lett. 49(4) 951-954 (2024)