Broadband and wide-angle light scattering media are highly desirable in photonic applications. In this paper, we theoretically investigate the light scattering properties of lumpy nanoparticles of silver, aluminum, and copper compared to those of smooth nanospheres with the same volume. The lumpy nanoparticles are found to provide broadband scattering enhancement over the smooth nanoparticles in a variety of dielectric environments. A maximum 18 enhancement in angular scattering for Al lumpy particles was found. More importantly, near-field scattering intensity mapping confirms that the enhanced scattering is achieved in all directions, making them more attractive in diverse photonic applications.
The authors acknowledge support from the Victorian Government to establish the Victoria-Suntech Advanced Solar Facility (VSASF) under the Victoria Science Agenda (VSA) scheme, and the Victorian Governmentt through the Victorian Fellowship.