Design and analysis of guided-mode resonance filter containing an absentee layer with an antireflective surface

Sang, Tian; Cai, Tong; Liu, Fang; Cai, Shaohong; Zhang, Dawei

doi:10.7498/aps.62.024215

Cited by 1 publication

(1 citation statement)

References 28 publications

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“…光学谐振腔是激光器的另外一个重要组成部分, 染料激光器多采用周期性的一维或二维衍射谐振腔, 以达到出射波长的连续可调谐. 基于导模共振效应的亚波长光栅是一种新型的衍射光学元件, 具有衍射效率高、共振波长和带宽可调谐以及在宽光谱范围内具有极高反射率等特性 [6] , 广泛应用于滤波片 [7,8] 、传感器 [9] 、光开关 [10] 等光学元件. 导模共振效应发生时, 结构内部产生局域场增强现象, 因此可用于增强光与物质的相互作用, 如石墨烯表面激发的高局域性表面等离子体激元 [11] 、荧光染料和量子点发光 [12,13] 、染料激光器 [14] 和垂直面发射激光器 [15,16] 得成品 [17] .…”

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Enhanced dye lasing emission by guided-mode resonance grating with mesoporous silica as spacing layer

Tao¹,

Wang²,

Kaige³

et al. 2021

Acta Phys. Sin.

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<sec>The enhancement of lasing emission intensity of dye laser is particularly important and urgently required due to a broad range of optical and electrical applications. The guided-mode resonance (GMR) effect occurs in a periodic waveguide structure where an incident wave is coupled to a leaky waveguide mode, and yields a resonance peak. The resonance wavelength can be easily controlled by adjusting the period of the grating, thickness of the waveguide layer, and refractive index of the covering materials. By using band edge states, one may be able to excite optical resonances extended over the entire structure surface, thereby achieving field enhancement over a large area. In this study, mesoporous silica with low refractive index is introduced between the grating layer and the substrate layer of the GMR structure to significantly enhance the contact between local electric field and gain medium. For comparison, another structure using SU-8 with high refractive index as the spacing layer is also proposed. It is clearly observed that the maximum of the electric field intensity is highly localized inside the SU-8 waveguide grating layer. However, it is shifted upward to the gain medium layer in the mesoporous silica structure due to the reverse symmetry waveguide structure design. Therefore, the interaction between laser dye and electric field is increased to further enhance the lasing emission.</sec><sec>Besides the refractive index, the waveguide layer, other structural parameters such as thickness of each layer and grating period also affect the electric field distribution in the GMR structure. Based on the finite-difference time-domain method, the structural parameters are analyzed and optimized. According to the simulation results, the structure parameters TWG = 3.5 μm, Λ = 700 nm, and <inline-formula><tex-math id="Z-20201229080229-1">\begin{document}$ T_{\rm TiO_2} = 20 $\end{document}</tex-math><alternatives><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="1-20201017_Z-20201229080229-1.jpg"/><graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="1-20201017_Z-20201229080229-1.png"/></alternatives></inline-formula> nm are chosen as the guideline for designing the dye laser, which generates the resonance wavelength of 820 nm the same as the absorption wavelength of dye molecules. Additionally, the laser characteristics excited by pump light with the wavelength of 820 nm are studied. The continuous laser output is obtained. The energy threshold is about 2.5 mJ/cm2, and the linewidth is about 0.3 nm. The proposed structure can effectively regulate the surface local electric field and enhance the interaction between pump light and gain medium. It can not only be used in lasers, but also provide reference for designing other light-emitting devices.</sec>

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