Abstract

In this work, the silicon-nitride-based double-layered photonic crystal slab (DPCS) operating on guided-mode resonance (GMR) is demonstrated to realize a high-sensitivity sensor. By applying the three-dimensional finite-difference time-domain (3D-FDTD) analysis method, the relationships between $Q$-factor and slab thickness, hole radius, and space distance are extensively explored. The highest $Q$-factor of 7605 has been obtained for the optimized structure. Through detecting the resonant peak shifts when the DPCS sensor is immersed in different liquids, we realize an ultrahigh sensitivity up to 937.64 nm/refractive index unit (RIU). On the other hand, particle detection is simulated by the above-mentioned sensor, and the explanations of different resonant shifts versus different trapped positions are sophisticatedly elucidated. Furthermore, the effect of the vertical alignment deviation (lattice displacement) of the two photonic crystal slabs (PCSs) on the $Q$-factor and transmittance is discussed in detail. The investigations show that the DPCS sensor allows an alignment deviation of ${\sim}{{40}}\;{\rm{nm}}$, which exhibits excellent fabrication error robustness.

© 2021 Optical Society of America

Full Article  |  PDF Article
More Like This
Double-layer Fano resonance photonic-crystal-slab-based sensor for label-free detection of different size analytes

Zheng Wang, Chao Wang, Fujun Sun, Zhongyuan Fu, Zekun Xiao, Jiawen Wang, and Huiping Tian
J. Opt. Soc. Am. B 36(2) 215-222 (2019)

Enhanced sensitivity in injection-molded guided-mode-resonance sensors via low-index cavity layers

Yi-Fan Ku, Hsun-Yuan Li, Wen-Hsin Hsieh, Lai-Kwan Chau, and Guo-En Chang
Opt. Express 23(11) 14850-14859 (2015)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics