TY - JOUR
T1 - Sensitivity enhancement in photonic crystal waveguide platform for refractive index sensing applications
AU - Dutta, Hemant Sankar
AU - Goyal, Amit Kumar
AU - Pal, Suchandan
N1 - Generated from Scopus record by KAUST IRTS on 2023-10-12
PY - 2014/1/1
Y1 - 2014/1/1
N2 - A photonic crystal (PhC) waveguide platform based on ring-shaped holes in a siliconon-insulator substrate is proposed in order to realize a refractive index sensor with an improved sensitivity. The three-dimensional finite-difference time domain method is used to analyze the proposed design. The sensitivity is estimated by measuring the shift in the upper band-edge of the output transmission spectrum. Sensitivity analysis of a conventionally designed PhC waveguide, followed by modification of the structure, has been carried out for improving the sensitivity by introducing a row of holes that forms the line defect. Further improvement in sensitivity is obtained by replacing the defect row of holes by ring-shaped holes, which shows a significantly high sensitivity along with considerable output signal strength. The optimized design shows a wavelength shift of 210 nm for a change in ambient refractive index from air (RI = 1) to xylene (RI =1.5), corresponding to an average sensitivity of 420 nm/RIU. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE).
AB - A photonic crystal (PhC) waveguide platform based on ring-shaped holes in a siliconon-insulator substrate is proposed in order to realize a refractive index sensor with an improved sensitivity. The three-dimensional finite-difference time domain method is used to analyze the proposed design. The sensitivity is estimated by measuring the shift in the upper band-edge of the output transmission spectrum. Sensitivity analysis of a conventionally designed PhC waveguide, followed by modification of the structure, has been carried out for improving the sensitivity by introducing a row of holes that forms the line defect. Further improvement in sensitivity is obtained by replacing the defect row of holes by ring-shaped holes, which shows a significantly high sensitivity along with considerable output signal strength. The optimized design shows a wavelength shift of 210 nm for a change in ambient refractive index from air (RI = 1) to xylene (RI =1.5), corresponding to an average sensitivity of 420 nm/RIU. © 2014 Society of Photo-Optical Instrumentation Engineers (SPIE).
UR - http://nanophotonics.spiedigitallibrary.org/article.aspx?doi=10.1117/1.JNP.8.083088
UR - http://www.scopus.com/inward/record.url?scp=84902133281&partnerID=8YFLogxK
U2 - 10.1117/1.JNP.8.083088
DO - 10.1117/1.JNP.8.083088
M3 - Article
SN - 1934-2608
VL - 8
JO - Journal of Nanophotonics
JF - Journal of Nanophotonics
IS - 1
ER -