Sub-Wavelength Grating Enhanced Ultra-Narrow Graphene Perfect Absorber
- 269 Downloads
A sub-wavelength grating has been elaborately designed to enhance the absorption of the monolayer graphene at λ = 1.55 μm based on the coupled leaky mode theory (CLMT). The results indicate that the absorption can reach 99.8% at the resonant wavelength, and the absorption peak is ultra-narrow due to the excitation of TM31 mode in the grating structure. Taking advantages of the tunable chemical potential of graphene which is bias voltage controllable, the proposed structure can function as an adjustable absorber. The high figure of merit up to 1329 and sensitivity with the value of 66 are achieved. With the ultra-narrow absorption band and tunable peak positions, the graphene perfect absorber holds great potential application in sensing and biology.
KeywordsGraphene Ultra-narrow perfect absorber Sub-wavelength grating Sensing
The authors acknowledge the support provided by the Ministry of Science and Technology of China (2017YFA0205801), the National Natural Science Foundation of China (11334008, 61705249, 61290301 and 61521005), the Fund of Shanghai Science and Technology Foundation (16JC1400401, 16ZR1445300, 16JC1400404), Shanghai Sailing Program (16YF1413200), Youth Innovation Promotion Association CAS (2017285), and Key research project of Frontier Science of Chinese Academy of Sciences (QYZDJ-SSW-JSC007).
- 2.Choi MK, Park I, Kim DC, Joh E, Park OK, Kim J, Kim M, Choi C, Yang J, Cho KW, Hwang JH, Nam JM, Hyeon T, Kim JH, Kim DH (2015) Thermally controlled, patterned graphene transfer printing for transparent and wearable electronic/optoelectronic system. Adv Funct Mater 25(46):7109–7118CrossRefGoogle Scholar
- 7.Zhu XL, Yan W, Jepsen PU, Hansen O, Mortensen NA, Xiao SS (2013) Experimental observation of plasmons in a graphene monolayer resting on a two-dimensional subwavelength silicon grating. Appl Phys Lett 102(13):4Google Scholar
- 12.Liu YH, Chadha A, Zhao DY, Piper JR, Jia YC, Shuai YC, Menon L, Yang HJ, Ma ZQ, Fan SH, Xia FN, Zhou WD (2014) Approaching total absorption at near infrared in a large area monolayer graphene by critical coupling. Appl Phys Lett 105(18):4Google Scholar
- 18.Palik ED (1998) Handbook of optical constants of solids. AcademicPress, BostonGoogle Scholar