Exponentially index modulated nanophotonic resonator for high-performance sensing applications

Diptimayee Dash, Jasmine Saini, Amit Goyal, Yehia Mahmoud Massoud

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


In this manuscript, a novel photonic crystal resonator (PhCR) structure having an exponentially graded refractive index profile is proposed to regulate and alter the dispersion characteristics for the first time. The structure comprises silicon material, where porosity is deliberately introduced to modulate the refractive index profile locally. The structural parameters are optimized to have a resonant wavelength of 1550 nm. Further, the impact of various parameters like incidence angle, defect layer thickness, and analyte infiltration on device performance is evaluated. Finally, the sensing capability of the proposed structure is compared with the conventional step index-based devices. The proposed structure exhibits an average sensitivity of 54.16 nm/RIU and 500.12 nm/RIU for step index and exponentially graded index structures. This exhibits the generation of a lower energy resonating mode having 825% higher sensitivity than conventional resonator structures. Moreover, the graded index structures show a 45% higher field confinement than the conventional PhCR structure.
Original languageEnglish (US)
JournalScientific Reports
Issue number1
StatePublished - Jan 25 2023

ASJC Scopus subject areas

  • General


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