TY - JOUR
T1 - Parity-time-symmetric whispering-gallery mode nanoparticle sensor [invited]
AU - Chen, Weijian
AU - Zhang, Jing
AU - Peng, Bo
AU - Özdemir, Şahin Kaya
AU - Fan, Xudong
AU - Yang, Lan
N1 - Funding Information:
Funding. Army Research Office (ARO) (W911NF-12-1-0026, W911NF1710189); National Natural Science Foundation of China (NSFC) (11674194, 61134008, 61622306); National Basic Research Program of China (973 Program) (2014CB921401); Tsinghua University Initiative Scientific Research Program; Tsinghua National Laboratory for Information Science and Technology (TNList) Cross-discipline Foundation; National Science Foundation (NSF) (ECCS-1303499); Directorate for Engineering (ENG) (EFMA1641109).
Funding Information:
Acknowledgment. J. Zhang is supported by the NSFC. X. Fan is supported by the NSF.
Publisher Copyright:
© 2018 Chinese Laser Press.
PY - 2018/5/1
Y1 - 2018/5/1
N2 - We present a study of single nanoparticle detection using parity-time (PT) symmetric whispering-gallery mode (WGM) resonators. Our theoretical model and numerical simulations show that, with balanced gain and loss, the PT-symmetric WGM nanoparticle sensor, tailored to operate at PT phase transition points (also called exceptional points), exhibits significant enhancement in frequency splitting when compared with a single WGM nanoparticle sensor subject to the same perturbation. The presence of gain in the PT-symmetric system leads to narrower linewidth, which helps to resolve smaller changes in frequency splitting and improve the detection limit of nanoparticle sensing. Furthermore, we also provide a general method for detecting multiple nanoparticles entering the mode volume of a PT-symmetric WGM sensor one by one. Our study shows the feasibility of PT-symmetric WGM resonators for ultrasensitive single nanoparticle and biomolecule sensing.
AB - We present a study of single nanoparticle detection using parity-time (PT) symmetric whispering-gallery mode (WGM) resonators. Our theoretical model and numerical simulations show that, with balanced gain and loss, the PT-symmetric WGM nanoparticle sensor, tailored to operate at PT phase transition points (also called exceptional points), exhibits significant enhancement in frequency splitting when compared with a single WGM nanoparticle sensor subject to the same perturbation. The presence of gain in the PT-symmetric system leads to narrower linewidth, which helps to resolve smaller changes in frequency splitting and improve the detection limit of nanoparticle sensing. Furthermore, we also provide a general method for detecting multiple nanoparticles entering the mode volume of a PT-symmetric WGM sensor one by one. Our study shows the feasibility of PT-symmetric WGM resonators for ultrasensitive single nanoparticle and biomolecule sensing.
UR - http://www.scopus.com/inward/record.url?scp=85046366715&partnerID=8YFLogxK
U2 - 10.1364/PRJ.6.000A23
DO - 10.1364/PRJ.6.000A23
M3 - Article
AN - SCOPUS:85046366715
SN - 2327-9125
VL - 6
SP - A23-A30
JO - Photonics Research
JF - Photonics Research
IS - 5
ER -