Nanoscopic Visualization of Fluorescence Excitation Probability on Two-dimensional Periodical Gold Nanohole Arrays

2019 ◽  
Vol 48 (9) ◽  
pp. 1119-1121 ◽  
Author(s):  
Keisuke Imaeda ◽  
Keiko Tawa ◽  
Kohei Imura
Keyword(s):  
Two Dimensional ◽  
Fluorescence Excitation ◽  
Nanohole Arrays ◽  
Excitation Probability

FABRICATION OF TWO-DIMENSIONAL PHOTONIC CRYSTALS WITH GE2SB2TE5 NANOHOLE ARRAYS BY NANOSPHERE LITHOGRAPHY

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1300-1305
Author(s):  
KI-HO SONG ◽  
HYUN-YONG LEE ◽  
HOE-YOUNG YANG ◽  
SUNG-WON KIM ◽  
JAE-HEE SEO ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Plasma Treatment ◽  
Treatment Time ◽  
Reduction Rate ◽  
Nanosphere Lithography ◽  
Two Dimensional ◽  
Photonic Bandgaps ◽  
Nanohole Arrays ◽  
Plasma Treatment Time ◽  
Lift Off

Two-dimensional photonic crystals (2D-PCs) with Ge 2 Sb 2 Te 5 ( GST ) nanohole arrays were prepared by the nanosphere lithography (NSL) process. A primary factor of PCs is that the refractive index (n) and the n-modulation can be realized by using the GST films, which exhibit a reversible phase transformation between amorphous and crystalline states by laser illumination. The polystyrene (PS) spheres with a diameter of 500 nm were spin-coated on Si substrate and subsequently reduced by O 2-plasma treatment. The reduced spheres were utilized as a lift-off mask of the NSL process and their size and separation could be precisely controlled. Amorphous GST films were thermally evaporated and then the reduced PS spheres were removed. The fabricated GST nanohole arrays were observed by SEM and AFM. The nanohole diameters are nearly linearly reduced with increasing plasma-treatment time (t). The reduction rate (δ) for the conditions of this work was evaluated to be ~ 0.92 nm/s. The period (Λ) and filling factor (η) of PCs are structure parameters that determine their photonic bandgaps (PBGs). η-modulation can be easily achieved via a control of t and the Λ can be also modulated by the use of PS spheres with specific diameter. In addition, the PBGs for the fabricated GST 2 D PC were calculated by considering the amorphous and crystalline states of GST .

Two-dimensional multispectral imager based on tiled arrangement of metallic nanohole arrays

2014 ◽  
Author(s):  
Mohamadreza Najiminaini ◽  
Bozena Kaminska ◽  
Jeffrey J. L. Carson
Keyword(s):  
Two Dimensional ◽  
Nanohole Arrays ◽  
Multispectral Imager

Phase difference mapping of two-dimensional metallic nanohole arrays

2012 ◽  
Vol 100 (23) ◽  
pp. 233102 ◽  
Author(s):  
S. L. Wong ◽  
H. C. Ong
Keyword(s):  
Phase Difference ◽  
Two Dimensional ◽  
Nanohole Arrays

scholarly journals Two-dimensional structure of the light-harvesting chlorophyll a/b complex by cryoelectron microscopy.

1988 ◽  
Vol 106 (5) ◽  
pp. 1515-1523 ◽  
Author(s):  
M K Lyon ◽  
P N Unwin
Keyword(s):  
Chlorophyll A ◽  
Light Harvesting ◽  
Unit Cell Dimension ◽  
Unit Cell ◽  
Dimensional Structure ◽  
Cryoelectron Microscopy ◽  
Two Dimensional ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Lhc Ii

The light-harvesting chlorophyll a/b complex (LHC-II) found in green plants has at least three functions: it absorbs light energy for transfer to the reaction centers, it is involved in keeping the photosynthetic membranes stacked, and it regulates energy distribution between the two photosystems. We have developed a procedure to produce large vesicles consisting almost exclusively of two-dimensional crystalline domains of LHC-II in which LHC-II is biochemically and structurally intact, as shown by SDS-PAGE, response to cations, and 77K fluorescence excitation spectra. The vesicles were examined by cryoelectron microscopy and analyzed, in projection, to a resolution of 17 A. Their surface lattice consists of trimers arranged in interlocking circles; the two-sided plane group is p321 (unit cell dimension, a = 124 A) with two, oppositely facing trimers/unit cell. Individual trimers consist of matter arranged in a ring, around a central cavity, an appearance similar to that obtained in some conditions using negative stain (Li, J., 1985. Proc. Natl. Acad. Sci. USA. 82:386-390). The monomer (approximately 45 x 20 A) is seen as two domains of slightly different size at this resolution. The thickness of single layers is approximately 48 A, measured from edge-on views of the frozen vesicles. Based on these dimensions, the molecular mass of the monomer is approximately 30 kD. Therefore, each monomer appears to be composed of a single polypeptide and its associated pigments.

Sign in / Sign up

Export Citation Format

Share Document