中国激光, 2020, 47 (7): 0701009, 网络出版: 2020-07-10
太赫兹量子级联激光器研究进展 
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Research Progress on Terahertz Quantum Cascade Lasers
图 & 表
图 1. 三种THz QCL有源区结构的导带图及两种波导结构[7]。(a)束缚态向连续态跃迁;(b)共振声子;(c)杂化结构;(d)半绝缘表面等离子体波导;(e)双面金属波导
Fig. 1. Conduction band diagrams of three types of THz QCL active regions and two kinds of waveguide structures[7]. (a) Bound to continuum; (b) resonant phonon; (c) hybrid structure; (d) semi-insulating surface plasmon waveguide; (e) metal-metal waveguide
图 2. 代表性的高性能THz QCL统计图。(a)代表性的THz QCL最高工作温度与频率的关系;(b)代表性的THz QCL最高输出功率随年份的变化
Fig. 2. Statistics of representative high-performance THz QCLs. (a) Relationship between representative THz QCL maximum operating temperature and frequency; (b) representative THz QCL maximum output power varies with year
图 3. 一维光栅THz QCL。(a)二阶DFB THz QCL[25];(b)渐变光子异质结THz QCL[26];(c)混合光栅DFB THz QCL[28];(d)三阶DFB THz QCL[29];(e)天线反馈等离子体THz QCL[30];(f)线DFB THz QCL[31]
Fig. 3. One-dimensional grating THz QCL. (a) Second-order DFB THz QCL[25]; (b) graded photonic heterostructure THz QCL[26]; (c) hybrid grating DFB THz QCL[28]; (d) third-order DFB THz QCL[29]; (e) antenna feedback plasmonic THz QCL[30]; (f) wire DFB THz QCL<
图 4. 二维光子结构THz QCL。(a)(b)环形光栅DFB THz QCL及模拟的基模TM1,42电场分布[32];(c)(d)同心圆光栅THz QCL及其远场[33];(e)(f)光子晶体THz QCL[34];(g)(h)渐变光子晶体THz QCL及其远场[35];(i)(j)光子准晶THz QCL及其电场分布[36];(k)(l)随机THz QCL及其电场分布[37]
Fig. 4. Two-dimensional photonic structure THz QCL. (a)(b) Ring DFB THz QCL and calculated TM1,42 mode[32]; (c)(d) concentric-circular-grating THz QCL and far-field[33]; (e)(f) photonic-crystal THz QCL[34]; (g)(h) grading photonic crystal THz QCL and far-field[35]; (i)(j) photonic quasi-crystal T
图 5. 基于超表面的THz VECSEL。(a)有源超表面结构[38];(b) THz VECSEL示意图[38];(c)超表面双面金属波导脊阵列示意图[38];(d) THz VECSEL的远场[38];(e) TM03超表面结构示意图[39];(f) TM03超表面THz VECSEL表征[39]; (g)~(i)极化敏感z字形超表面THz VECSELFig. 5. THz VECSEL based on metasurface. (a) Active metasurface structure[38]; (b) schematic of THz VECSEL[38]; (c) schematic of metal-metal waveguide ridge array for metasurface[38]; (d) far field of THz VECSEL[38]; (e) schematic of TM03 metasurface[39
Fig. 5. THz VECSEL based on metasurface. (a) Active metasurface structure[38]; (b) schematic of THz VECSEL[38]; (c) schematic of metal-metal waveguide ridge array for metasurface[38]; (d) far field of THz VECSEL[38]; (e) schematic of TM03 metasurface[39
图 6. 射频调制对THz QCL发射谱的影响,其中灰色谱线为自由工作状态下发射谱,黑色谱线为射频调制下的发射谱。(a)半绝缘表面等离子体波导THz QCL的发射谱[42];(b)双面金属波导THz QCL的发射谱[24]
Fig. 6. Effect of radio frequency modulation on THz QCL emission spectrum, where the gray spectrum line is emission spectrum in free running mode, and black spectrum line is emission spectrum with RF modulation. (a) Emission spectrum of THz QCL with semi-insulating surface plasmon waveguide[42]; (b) emission spectrum of THz QCL with metal-metal waveguide[24]
图 7. 集成石墨烯被动稳频THz QCL光频梳。(a)不同脊条宽度激光器群速色散模拟[43];(b)不同脊条宽度激光器的拍频信号表征[43];(c)集成石墨烯THz QCL示意图[44];(d) FP-QCL、Si-QCL和GiSAM-QCL的拍频信号表征[44]
Fig. 7. Passive frequency comb based on graphene-coupled THz QCL. (a) Group velocity dispersion simulations for lasers with different ridge widths[43]; (b) inter-mode beat note of three lasers with different ridge widths[43]; (c) schematic of graphene-coupled THz QCL[44]; (d) inter-mode beat note of FP-QCL, Si-QCL, and GiSAM-QCL[
万文坚, 黎华, 曹俊诚. 太赫兹量子级联激光器研究进展[J]. 中国激光, 2020, 47(7): 0701009. Wan Wenjian, Li Hua, Cao Juncheng. Research Progress on Terahertz Quantum Cascade Lasers[J]. Chinese Journal of Lasers, 2020, 47(7): 0701009.
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