Archives March 2021

Congratulations for our new paper in journal of Optical Materials

Electro-Optical Switch based on One-Dimensional Graphene-Plasmonic Crystals

Sakineh Almasi Monfared, Mahmood Seifouri, Seyedeh Mehri Hamidi,
Seyed Majid Mohseni

In the present study, an electro-optical switch using one-dimensional plasmonic photonic crystals and bilayer graphene was demonstrated experimentally and theoretically. The optical modes of band gap in crystal can be tuned due to the unique optical properties of plasmonic surface resonance at grating and graphene layers. In addition, the excitation of the periodic arrays of metallic resulted in exciting plasmonic surface lattice resonance and creating two reflectance modes for magnetic polarization at 54° incidence angle. Further, the chemical potential of graphene was controlled by applying a gate voltage to achieve an optoelectronic switching operation. Applying voltage of 1 V led to a sharp increase in the relative permittivity of bilayer graphene around the first resonance. Thus, the light was absorbed, its intensity deceased, and the plasmonic resonance wavelength shifted by a value of ~9 nm. Based on the results, using this new kind of structures had advantages such as small size, low power consumption, easier fabrication, and less manufacturing cost, as well as the high controllability of conductivity compared to the other methods.

News On Magneto-Electronic

In this days, the Journal of Nano Energy publishes a new paper entitled as “A multiferroic module for biomechanical energy harvesting”

The growth and ubiquitous use of mobile electronics and the Internet of Things is driving a rapid surge in research into self-powered personal electronic devices and sensor networks. Scavenging human biomechanical energy via piezoelectricity or triboelectricity is a viable strategy to address the limited lifespan and periodic recharging issues of conventional batteries. Here, we report a self-charging multiferroic module for sustainable operation of personal mobile electronics, by exploiting multiferroic composites in response to biomechanical energy via mechano magneto-electric energy conversion. The multiferroic energy harvesting module consists of a movable permanent magnet that transduces mechanical energy into magnetic energy, and a pair of piezoelectric/ magnetostrictive magnetoelectric (ME) laminates that function to convert magnetic energy into electrical energy. The multiferroic energy harvesting device exhibits an efficient mechano-magneto-electric energy conversion performance with open-circuit voltage of  ~ 17 V and short-circuit current ~ 7.2 µA under mechanical excitation equivalent to human running. This multiferroic module has been demonstrated during human running as a viable power source for temperature and humidity sensors, Bluetooth arphones and night running indicators, which suggests application in sustainable personal electronics and even the Internet of Things.