Anand Benoy, Krishnan S R, Podila Ramakrishna, Sai S Siva Sankara, Rao Apparao M, Philip Reji
Department of Physics, Sri Sathya Sai Institute of Higher Learning, Prashanti Nilayam, Andhra Pradesh, 515134, India.
Phys Chem Chem Phys. 2014 May 14;16(18):8168-77. doi: 10.1039/c3cp55334e.
In bulk materials, defects are usually considered to be unwanted since deviations from perfect lattices may degrade device performance. Interestingly, the presence of defects throws open new possibilities in the case of nanostructures due to the properties related to their limited size scale. Defects and disorders which alter the electronic structure of nanostructures can significantly influence their electronic, magnetic and nonlinear optical properties. Here, we show that defect engineering is an effective strategy for tailoring the nonlinear optical (NLO) properties of carbon and ZnO nanostructures. The effects of surface states, lattice disorders, polycrystalline interfaces and heterogeneous dopants on the nonlinear absorption behaviour of these nanostructures are discussed in detail. Realistic tunable NLO features achieved by controlling such defects enhance the scope of these nanostructures in device applications such as optical limiting, optical switching, pulse shaping, pulse compression and optical diode action.
在块状材料中，缺陷通常被认为是有害的，因为与完美晶格的偏差可能会降低器件性能。有趣的是，由于与纳米结构有限尺寸相关的特性，缺陷的存在为纳米结构带来了新的可能性。改变纳米结构电子结构的缺陷和无序会显著影响其电学、磁学和非线性光学性质。在此，我们表明缺陷工程是一种调整碳和氧化锌纳米结构非线性光学（NLO）性质的有效策略。详细讨论了表面态、晶格无序、多晶界面和异质掺杂剂对这些纳米结构非线性吸收行为的影响。通过控制此类缺陷实现的实际可调谐NLO特性扩大了这些纳米结构在诸如光限幅、光开关、脉冲整形、脉冲压缩和光二极管作用等器件应用中的范围。
