降低光子晶體諧振腔Q值的方法分析
doi: 10.11999/JEIT140486 cstr: 32379.14.JEIT140486
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61372050, 61250008)資助課題
Analysis of the Method to Decrease the Q Value in Photonic Band Gap Cavity
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摘要: 該文在分析計(jì)算金屬光子晶體的正三角形晶格TE模式的色散特性、全局帶隙分布圖的基礎(chǔ)上，針對(duì)金屬光子晶體結(jié)構(gòu)諧振腔Q值較高的問題，對(duì)降低光子晶體諧振腔Q值的方法進(jìn)行了分析和設(shè)計(jì)。采用加載介質(zhì)柱的混合結(jié)構(gòu)和介質(zhì)微擾兩種方法分別對(duì)諧振腔的Q值進(jìn)行有效的控制，并分析了兩種方法對(duì)諧振腔模式選擇性的影響。結(jié)果表明，兩種方法都能在不改變諧振腔模式選擇性和場(chǎng)分布的基礎(chǔ)上有效降低Q值，而介質(zhì)微擾的方法還同時(shí)清除了與TE04競(jìng)爭(zhēng)的兩種雜模，提高了模式選擇性。
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關(guān)鍵詞:
- 光子帶隙 /
- Q值 /
- 諧振腔 /
- 模式競(jìng)爭(zhēng)
Abstract: Based on analyzing the dispersion characteristics and global band gaps for general two-dimensional Photonic Band Gap (PBG) structures formed by triangular arrays of metal posts for TE modes, two methods are proposed to solve the problem of the high Q value in PBG cavity. The result shows that the Q value can be effectively controlled by loading media structures or inserting dielectric perturbation in PBG cavity. In consideration of mode competition in PBG cavity, the mode selection is calculated respectively for the two methods. It is shown that the two methods both can control the Q value without reducing the mode selection or changing the electric field distribution of TE04 mode. In addition, two competing modes are cleared in the method of dielectric perturbation, which improves the mode selection at the operation frequency of TE04 mode.-
Key words:
- Photonic Band Gap (PBG) /
- Q value /
- Resonator /
- Mode competition
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