Journal
NANO LETTERS
Volume 15, Issue 3, Pages 1759-1765Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl504442v
Keywords
Silicon nanoblock; leaky-mode resonance; resonant scattering; scattering cross section; structural color
Categories
Funding
- National Research Foundation of Korea (NRF) [2013R1A2A2A01014224, 2014M3A6B3063709, 2014M3C1A3052537, 357-2011-1-C00041, 2012R1A6A3A01039034]
- Air Force Office of Sponsored Research [FA9550-14-1-0117]
- National Research Foundation of Korea [2012R1A6A3A01039034, 2013R1A2A2A01014224, 357-2011-1-C00041] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
We explore the shape-dependent light scattering properties of silicon (Si) nanoblocks and their physical origin. These high-refractive-index nanostructures are easily fabricated using planar fabrication technologies and support strong, leaky-mode resonances that enable light manipulation beyond the optical diffraction limit.-Dark-field microscopy and a numerical modal analysis show that the nanoblocks can be viewed as truncated Si waveguides, and the waveguide dispersion strongly controls the resonant properties. This explains why the lowest-order transverse magnetic (TM01 mode resonance can be widely tuned over the entire visible wavelength range depending on the nanoblock length, whereas the wavelength-scale TM11 mode resonance does not change greatly. For sufficiently short lengths, the TM01 and TM11 modes can be made to spectrally overlap, and a substantial scattering efficiency, which is defined as the ratio of the scattering cross-section to the physical cross section of the nanoblock, Of,similar to 9.95, approaching the theoretical lOwest-order single-channel scattering limit, is achievable. Control over the subwavelength-scaleleaky-mode resonance allows Si nanoblOcks to generate vivid structural color, manipulate forward and backward scattering, and as excellent photonic artificial atoms for metasurfaces.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available