Broadband and high absorption in Fibonacci photonic crystal including MoS₂ monolayer in the visible range

Abstract

2D molybdenum disulfide MoS2, has represented potential applications in optoelectronic devices based on their promising optical absorption responses. However, for practical applications, absorption should increase furthermore in a wide wavelength window. In this paper, we design Fibonacci photonic crystals (PCs) based on Si, SiO2 and MoS2 monolayer and we calculate their absorption responses based on the transfer matrix method. The optical refractive index of the MoS2 monolayer was determined based on the Lorentz–Drude–Gauss model. Effects of Fibonacci order, periodicity, incident light angle and polarization are included in our calculations. Finally, an absorption as large as 90% in a wide optical wavelength range is achieved for both polarizations and incident angle down to 60°. Our results are useful for designing photonic devices with high absorption efficiency.

Broadband absorption of monolayer MoS2 in visible region using a tetramerized nanorod metasurface

“…In particular, the monolayer MoS 2 contributions the dominant absorption of the total structure, and the average absorption of 64.5% can be realized in the range of 400-750 nm. Comparing with other MoS 2 -based broadband absorbers operating in the visible region, the average absorption of 92.4% of the total structure is comparable with the multilayer-based absorbers consisting of multiple monolayer MoS 2 [20][21][22] or Bragg mirrors [23,24]. Also, the average absorption of the total structure is comparable with the slot-hole-based absorber [25], but its average absorption of 64.5% from the monolayer MoS 2 is a slightly larger comparing with the latter.…”

“…However, for the applications of photovoltaic and thermo-photovoltaic devices, broadband absorption performances of monolayer MoS 2 are essential. Recently, it is shown that broadband absorption enhancement of monolayer MoS 2 can be achieved by using the multilayer structure consisting of multiple monolayer MoS 2 [20][21][22], or by integrating the monolayer MoS 2 with Bragg mirror and patterned surface [23,24]. However, the bulk sizes of these devices are increased due to the introduction of a large number of high/low dielectric layers.…”

MoS 2 -based absorbers: whole visible spectrum coverage with high efficiency

“…Although these absorption amounts are astonishing compared to the atomic thickness of the MoS 2 , to design a MoS 2 -based absorber these values should increase. To do this, using stacks of layers in the form of photonic crystals or quasi-photonic crystals were suggested 4,[8][9][10][11][12] . Although within this method broadband absorption efficiencies above 90% is reported, due to the usage of more than hundred layers with multi-stacks of MoS 2 , fabrication of such structure is experimentally complicated.…”

Approaching multi-band and broadband high absorption based on one-dimensional layered structures containing monolayer MoS2

“…It is well known that an absorber is highly desired for many applications such as photodetectors, solar cells, and thermal management [19][20][21][22][23]. Recently, monolayer MoS 2 has been utilized to realize high absorption in visible frequency range [24][25][26][27][28][29][30][31][32][33][34][35][36][37]. However, determined by the ultrathin thickness of monolayer MoS 2 , the light absorption efficiency of monolayer MoS 2 is low (exhibiting absorption only about 10% in the wavelength region above its band-gap at normal incident light) [37], which limits its progress towards many practical applications.…”

“…N. Ansari et al studied 1D photonic crystal including periodic dielectric layers with monolayer MoS 2 constituent layers and alternative layers order and found that such a structure can increase optical absorption [28]. Photonic quasicrystals with monolayer MoS 2 , such as Fibonacci, Thue-Morse and Octonacci ordered artificial sequences, have been chosen to fabricate new types of broadband absorber in the visible frequency range because of their unique band structure [24,25,30]. Also, efforts have been made on absorbers with multi-band absorption peaks due to their important role in multi-spectral detection, sensing, optical communication, and electro-optical systems.…”