Design of an ultra-compact slotted photonic crystal nanobeam cavity for biosensing

Here, we elucidate a novel biosensor in aqueous environments based on a slotted photonic crystal nanobeam cavity. A slot is introduced in the center of the photonic crystal nanobeam cavity, which reduces the mode volume by an order of 10 without sacrificing the quality factor and sensitivity. This sensor is characteristic of an ultra-small mode volume of 0.076(λ/n)3 and shows a prominent advantage in regards to single nanoparticle detection, where the minimum detectable nanoparticle radius is around 1 nm. Additionally, its quality factor is as high as 6.08×106 and its sensitivity is around 460 nm/RIU, which is promising for refractive index sensing. This sensor can also be integrated into a high-density array of sensor networks because of the unparalleled fabrication advantages.

[1]  Peter Norvig,et al.  Artificial Intelligence: A Modern Approach , 1995 .

[2]  P. Deotare,et al.  Photonic crystal nanobeam cavity strongly coupled to the feeding waveguide , 2010, 1002.1319.

[3]  Yuefeng Ji,et al.  High-Q and high-sensitivity width-modulated photonic crystal single nanobeam air-mode cavity for refractive index sensing. , 2015, Applied optics.

[4]  Y. Rahmat-Samii,et al.  Smallest possible electromagnetic mode volume in a dielectric cavity : Photonic crystals and microstructures , 1998 .

[5]  Yuefeng Ji,et al.  Design of simultaneous high-Q and high-sensitivity photonic crystal refractive index sensors , 2013 .

[6]  D. Erickson,et al.  Nanoscale optofluidic sensor arrays. , 2008, Optics express.

[7]  K. Vahala,et al.  High sensitivity nanoparticle detection using optical microcavities , 2011, Proceedings of the National Academy of Sciences.

[8]  A. Doherty,et al.  Cavity Quantum Electrodynamics: Coherence in Context , 2002, Science.

[9]  Jeffrey N. Anker,et al.  Biosensing with plasmonic nanosensors. , 2008, Nature materials.

[10]  Tomoyuki Yoshie,et al.  Optical Microcavity: Sensing down to Single Molecules and Atoms , 2011, Sensors.

[11]  Romuald Houdré,et al.  Refractive index sensing with an air-slot photonic crystal nanocavity. , 2010, Optics letters.

[12]  Janos Vörös,et al.  The density and refractive index of adsorbing protein layers. , 2004, Biophysical journal.

[13]  Qianfan Xu,et al.  Experimental demonstration of guiding and confining light in nanometer-size low-refractive-index material. , 2004, Optics letters.

[14]  Xingwang Zhang,et al.  Ultralow sensing limit in optofluidic micro-bottle resonator biosensor by self-referenced differential-mode detection scheme , 2014 .

[15]  Yaocheng Shi,et al.  Slotted photonic crystal nanobeam cavity with parabolic modulated width stack for refractive index sensing. , 2013, Optics express.

[16]  Sindy K. Y. Tang,et al.  Single particle detection in CMOS compatible photonic crystal nanobeam cavities. , 2013, Optics express.