Author Affiliations
1School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China2College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, Chinashow less
Fig. 1. Schematic of double-concave cavity of metallic semiconductor nanolaser: (a) The structure; (b) top view of the double-concave cavity.双凹型金属半导体纳米激光器谐振腔示意图 (a)结构示意图; (b)俯视图
Fig. 2. Q values of the capsule-shaped cavities (L = 700 nm, W = 520 nm) as functions of the radius of curvature R.
CSC型谐振腔(L = 700 nm, W = 520 nm) Q值与曲率半径R的关系
Fig. 3. Quality factors Q, radiation quality factors Qrad and dissipation quality factors Qdiss of three double-concave cavities with curved sidewalls (L = 700 nm, W = 520 nm, L/R = 1.43) as functions of the W0/W: (a) Q; (b) Qrad; (c) Qdiss.
三种曲线侧壁的双凹型谐振腔(L = 700 nm, W = 520 nm, L/R = 1.43)的品质因子Q、辐射品质因子Qrad和耗散品质因子Qdiss与W0/W的关系 (a) Q; (b) Qrad; (c) Qdiss
Fig. 4. Normalized electric field intensity distribution |E|2 of the resonant mode (TE mode) in the xy-, yz- and xz-planes crossing the cavity center: (a)–(c) The capsule-shaped cavity; (d)–(f) the linear-function-shaped cavity; (g)–(i) the parabola-shaped cavity; (j)–(l) the cosine-shaped cavity. All the geometric parameters of the cavities are listed in Table 2 in detail.
不同谐振腔结构的谐振模式(TE模式)的归一化电场强度|E|2在穿过腔中心的xy、yz、xz平面的分布图 (a)— (c)为胶囊型腔; (d)— (f)为一次函数型腔; (g)— (i)为抛物线型腔; (j)—(l)为余弦函数型腔. 所有腔的几何参数详见表2
Fig. 5. The confinement factor Γ, threshold gain gth and threshold current Ith of the metallic semiconductor nanolasers with three double-concave cavities with curved sidewalls (L = 700 nm, W = 520 nm, L/R = 1.43) as functions of the W0/W: (a) Γ; (b) gth; (c) Ith.
三种曲线侧壁双凹型谐振腔(L = 700 nm, W = 520 nm, L/R = 1.43)的金属半导体纳米激光器的限制因子Γ、阈值增益gth和阈值电流Ith与W0/W的关系 (a) Γ; (b) gth; (c) Ith
侧壁曲线类型 | 侧壁曲线方程 | 一次函数型 | y = |a1x| + W0/2
| 抛物线型 | y = a2x2 + W0/2
| 余弦函数型 | y = a3cos(bx) + W/2
|
|
Table 1. Curve equations of the sidewalls of the double-concave cavities
参数 | 胶囊型 | 一次函数型 | 抛物线型 | 余弦函数型 | L/nm
| 700 | 700 | 700 | 700 | W/nm
| 520 | 520 | 520 | 520 | W0/W | 1.00 | 0.75 | 0.8 | 0.80 | L/R | 1.43 | 1.43 | 1.43 | 1.43 | V/λ3 | 0.267 | 0.258 | 0.257 | 0.258 | λ/nm
| 1564 | 1552 | 1550 | 1551 | Q | 141 | 174 | 175 | 176 | Г | 0.460 | 0.441 | 0.440 | 0.445 | gth/cm–1 | 2190 | 1870 | 1850 | 1830 | Ith/μA
| 800 | 290 | 280 | 260 |
|
Table 2. Geometric parameters and simulation results of the metallic semiconductor nanolasers with four types of cavities.