Electromagnetic metamaterial-inspired band gap and perfect transmission in semiconductor and graphene-based electronic and photonic structures

A theoretical design of evanescent wave biosensors based on gate-controlled graphene surface plasmon resonance

“…The self-biasing scheme is considered in Fig. 1 a; therefore, the gate voltage can be determined by , where is the gate capacitance of the silicon oxide in the unit of ; is the relative dielectric constant at dc (about 3.9 for ); the relation between and can be approximated as 49 .…”

Electrically or chemically tunable photodetector with ultra high responsivity using graphene/InN nanowire based mixed dimensional barristors

“…The discovery of graphene, a two-dimensional (2D) array of carbon atoms in a hexagonal lattice, marked the beginning of an entirely new era of research, fueled by its exceptional properties [1], such as exceptionally high mobility [2,3], ultra high thermal conductivity [4], ability to respond to a wide variety of surface adsorbates [5], etc. Although the zero band gap of graphene turned it into a poor material for field effect transistors (FETs) in terms of switching [6], it has been wellestablished that this shortcoming can be effectively overcome by forming a heterojunction with graphene and another semiconductor, with additional benefits stemming from the presence of a Schottky barrier at the hetero-interface [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. The functionality of these devices can be further enhanced, by realizing a gate tunable version of this device structure where the Schottky barrier height (SBH) can be modified electrically, turning it into a Schottky barrier transistor (i.e.…”

“…'barristor'). These devices can find wide spread applications in RF electronics, molecular sensing, photo detection, analog amplification and digital electronics [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. Since graphene absorbs about 2.3% of the incident light per layer, mono-or bilayer graphene is an excellent candidate for transparent electrodes with the additional benefit provided by the SBH that can be tuned by electrically or chemically modifying its Dirac point [25].…”