-
非线性光学作为现代光学的一门重要分支, 在各个领域都有着重要的研究意义和应用价值. 然而, 受限于材料固有的非线性极化率和与外来光场的有限作用长度, 其非线性光学响应很弱. 等离激元纳米结构可以将外来光场束缚在纳米结构周围, 在光谱共振局域空间内形成一个巨大的电磁场增强, 从而极大地促进光与物质的相互作用, 提高了非线性光学响应. 超快脉冲激光由于其优异的性能已经广泛应用于光通信、精密测量、生物医学、军用激光武器等重要领域, 虽然商用的激光器已经发展得非常成熟, 可以达到超高的峰值功率、超短的脉宽以及超高的重频, 但是在中远红外波段的超快脉冲研究仍然是一个缺口, 所以寻找一种性能优异的可饱和吸收体材料对于脉冲激光的发展具有重要的意义. 本文综述了基于贵金属和非贵金属的等离激元纳米结构在超快光开关和脉冲激光方面的应用进展. 很多宽禁带半导体, 通过掺杂可以表现出类似金属的性质, 由于掺杂可以形成自由载流子, 当其尺寸在纳米尺度时, 就会表现出局域表面等离激元共振的特性, 从而实现超快的非线性光学响应, 并且掺杂的载流子浓度不能达到金属载流子的浓度, 可以有效减小过高载流子引起的带间损耗. 通过泵浦探测和Z扫描测试发现, 这些等离激元纳米结构在红外波段表现出超快的非线性光学响应以及宽带可调的性质, 可以产生几百飞秒量级的脉冲激光, 表明它们在超快光子学领域有很大的应用前景. 最后总结了不同体系等离激元材料的优势和不足, 展望了未来的发展和需要改进的工作.Nonlinear optical (NLO) effects are ubiquitous in the interaction of light with different materials. However, the NLO responses of most materials are inherently weak due to the small NLO susceptibility and the limited interaction length with the incident light. In plasmonic nanostructures the optical field is confined near the surface of the structures, so that the electromagnetic field is greatly enhanced in a localized fashion by spectral resonance. This effect results in the enhancement of light-matter interaction and NLO response of the material. Ultrafast pulse lasers have been widely used in optical communication, precise measurement, biomedicine, military laser weapons and other important fields due to their excellent performances. Although commercial lasers become very matured, they can achieve ultra-high peak power and ultra-short pulse width and ultra-high repetition rate, but the ultra-fast pulses in the mid-to-far infrared band are seldom studied, so finding a saturable absorber material with excellent performance is of great significance for developing the pulsed lasers. In this paper, we review the recent research progress of the applications of exiton nanostructure in ultrafast optical switches and pulse lasers based on noble metal and non-noble metals. The metallic system mainly refers to gold and silver nanoparticles. For non-noble metals, we mainly introduce our researches of chalcogenide semiconductor, heavily doped oxide and titanium nitride. A variety of wide bandgap semiconductors can exhibit metal-like properties through doping. Since doping can form free carriers, when their size is reduced to a nanometer scale, they will show the characteristics of local surface plasmon resonance, thus realizing ultra-fast nonlinear optical response, and the concentration of doped carriers cannot reach the level of metal carriers, thus being able to effectively reduce the inter-band loss caused by excessively high carriers. Through pump probe detection and Z-scan testing, we found that these plasmonic nanostructures exhibit ultrafast NLO response in tunable resonance bandwidth, which has been utilized as a working material for developing the optical switch to generate the pulsed laser with duration down to a femtosecond range. These results take on their potential applications in ultrafast photonics. Finally, we make a comparison of the pros and cons among different plasmonic materials and present a perspective of the future development.
-
Keywords:
- nonlinear optics/
- saturable absorber/
- surface plasmon/
- pulse laser
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76] -
激光
波段光开关材
料体系激光器运
行模式最短
脉宽重频 1.0 μm MoO3–x 光纤(ML) 130 ps 17 MHz[72] Cu2–xS 固体(ML) 7.8 ps 84.17 MHz[67] TiN 固体(QS) 0.25μs 590 kHz[74] Ag 固体(ML) 27 ps 6.5 GHz[64] 1.5 μm Cu2–xS 光纤(ML) 295 fs 7.28 MHz[67] TiN 光纤(ML) 763 fs 8.19 MHz[74] ITO 光纤(ML) 593 fs 16.62 MHz[70] Au 光纤(ML) 12 ps 34.7 MHz[75] Cu-Sn-S 光纤(ML) 923 fs 4.99 MHz[76] 2.0 μm IZO 固体(QS) 3.61 μs 17.32 kHz[71] Au 光纤(QS) 2.4 μs 100.5 kHz[63] 2.8 μm Cu2–xS 光纤(QS) 0.75 μs 90.7 kHz[67] IZO 固体(QS) 0.56 μs 157.63 kHz[71] Au 固体(QS) 533 ns 53.1 kHz[62] 3.6 μm IZO 固体(QS) 1.78 μs 56.2 kHz[71] 
下载:
导出CSV
-
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] [37] [38] [39] [40] [41] [42] [43] [44] [45] [46] [47] [48] [49] [50] [51] [52] [53] [54] [55] [56] [57] [58] [59] [60] [61] [62] [63] [64] [65] [66] [67] [68] [69] [70] [71] [72] [73] [74] [75] [76]
下载:
计量
- 文章访问数:9801
- PDF下载量:288
- 被引次数:0