制造高质量、不含光学波段缺陷的三维光子晶体(photonic crystal)一直是项艰巨的挑战,不过日本科学家最近研发出一项简单、由大作小(top-down)的新技术,可望突破此难题,让光子晶体更接近实际应用。光子晶体通常是指介电系数具周期性变化的微结构,这种周期性变化将会导致能隙(ph Creating a high-quality, photonic crystal without optical-band defects has been a daunting challenge, but Japanese scientists recently developed a simple, top-down new technology that is expected to break through this The problem, let photonic crystal more practical application. Photonic crystals usually refer to microstructures with periodically varying dielectric coefficients. Such periodic changes will lead to energy gaps (ph