Abstract-Long-range surface plasmon-induced tunable ultralow threshold optical bistability using graphene sheets at terahertz frequency

Aparupa Kar, Nabamita Goswami, and Ardhendu Saha

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-56-8-2321&origin=search

A proposal on optical bistability at ultralow switching threshold and lower Fermi-level of graphene around 2 THz is implemented analytically through the proposed long-range surface plasmon resonance configuration by employing local field enhancement effects owing to the excitation of a graphene symmetric mode within graphene sheets. Reported threshold intensity for the optical bistability to date is 1.6  kW/cm2$1.6\mathrm{kW}/{\mathrm{cm}}^2$ within the terahertz region and 1.83  MW/cm2$1.83\mathrm{MW}/{\mathrm{cm}}^2$at near-IR range. Whereas the proposed scheme explores the possibility of reducing this threshold down to 143.68  W/cm2$143.68\mathrm{W}/{\mathrm{cm}}^2$, this technique proffers potential applications in nanoillumination, optical memory, and all-optical switching at an ultra-low threshold.

© 2017 Optical Society of America