Munakata K, Harada K, Anji H, Itoh M, Yatagai T, Umegaki S
Opt Lett. 2001 Jan 1;26(1):4-6. doi: 10.1364/ol.26.000004.
The diffraction efficiency of a surface-relief grating (SRG) was dramatically increased by corona discharge. We fabricated this SRG by applying surface modulation to azo polymer films, using laser interference fringes. The electric charge was deposited upon the SRG by a corona discharge in an oven. The first-order diffraction efficiency measured before and after corona discharge above the glass-transition temperature increased from ~2% to ~40% in a SRG written with a circularly polarized beam. The relief depth of the SRG as measured with an atomic-force microscope also increased, from ~130 nm to ~450 nm. The increase in diffraction efficiency was independent of the writing polarization.
通过电晕放电显著提高了表面浮雕光栅（SRG）的衍射效率。我们利用激光干涉条纹对偶氮聚合物薄膜进行表面调制来制造这种SRG。通过在烘箱中进行电晕放电，电荷沉积在SRG上。在玻璃化转变温度以上进行电晕放电前后测量的一阶衍射效率，在用圆偏振光束写入的SRG中从约2%提高到了约40%。用原子力显微镜测量的SRG的浮雕深度也从约130纳米增加到了约450纳米。衍射效率的提高与写入偏振无关。
