Theoretical modelling of tunable narrow band reflective spectrum using nanoscale surface plasmons

• Published in: Optics communications Vol. 389; pp. 10 - 14
• Main Authors: Yang, J., Lin, G.W., Niu, Y.P., Gong, S.Q.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.04.2017
• Subjects: Four-level tripod system; Surface plasmon; Ultranarrow band spectrum; Surface plasmon; Four-level tripod system; Ultranarrow band spectrum
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2016.12.018

The spectrum width can be narrowed to a certain degree by decreasing the coupling strength for the two-level emitter coupled to the propagating surface plasmon. But the width can not be narrowed any further because of the loss of the photon out of the system by the spontaneous emission of the emitter. Here we accurately solve the single photon scattering problem for the surface plasmon coupling with a four-level tripod emitter, and propose a new scheme to obtain the reflective spectrum with tunable ultranarrow band. It is shown that the spectrum width can be narrowed avoiding the impact of the loss. Furthermore, the position of ultranarrow peak can be tunable by choosing the appropriate parameters. •The transport property for the four level coupling system is accurately solved.•A scheme to obtain reflective spectrum with tunable ultranarrow band is proposed.•The spectrum width can be narrowed avoiding the impact of the loss.•The position of the peak can be tunable by choosing the appropriate parameters.