Nonlinear control of absorption in one-dimensional photonic crystal with graphene-based defect

Abstract

Perfect, narrow-band absorption is achieved in an asymmetric 1D photonic crystal with a monolayer graphene defect. Thanks to the large third-order nonlinearity of graphene and field localization in the defect layer we demonstrate the possibility to achieve controllable, saturable absorption for the pump frequency.

Enhanced absorption of monolayer MoS2 with resonant back reflector

“…Thus, to promote the applications of monolayer MoS 2 , the optical absorptance in monolayer MoS 2 waves should be enhanced. In studies of graphene, several mechanisms have been proposed to enhance the absorption of graphene, e.g., periodically patterned graphene, surface plasmon, microcavity, graphene-negative permittivity metamaterials, and attenuated total reflectance, etc [15][16][17][18][19][20][21][22][23]. The interaction between graphene and optical beams can also be enhanced when the graphene layers are prepared on top of one-dimensional photonic crystal (1DPC) or with resonant metal back reflectors because of the Fabry-Perot (F-P) cavity effect [24][25][26].…”

Tunable absorption in graphene-based hyperbolic metamaterials for mid-infrared range

“…All materials data are previously obtained [15,37] . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 The GHMM parameters are as follows: n C ¼ 1.5, t C ¼30 nm, μ¼0.1 eV, N ¼ 9.…”

“…The low absorption is restricted in many applications, shch as photodetectors and saturable absorbers. Recently, perfect absorption of graphene has licited attention from researchers [15,16].…”

Nonlinear graphene plasmonics

“…(A wealth of literature on graphene saturable absorbers can be found in [101,102] and thus will not be cited here.) More recently, when graphene was integrated into waveguides, a number of proposals to use graphene in waveguide-based devices include regenerative oscillation and FWM as shown in figure 10a [98,103,104], soliton propagation as shown in figure 10b [105], enhancement of nonlinearity and third-harmonic generation in a graphene-clad fibre [50,106,107] as well as improvements to third-harmonic generation and nonlinear absorption through field localization in a photonic crystal waveguide [108,109].…”