Barabanenkov, M. Yu.

English

Электронная библиотека БГУ

13 
OPTICAL PROPERTIES OF PERIODIC THREAD-LIKE DIFFRACTION 
GRATINGS AND PHOTONIC STRUCTURES 
M.Yu. Barabanenkov 
Institute of Microelectronics Technology Russian Academy of Sciences, 
Chernogolovka, Moscow Region, Russia 
A reflection (transmission) spectra of 2D rod like, threadlike and metal-
dielectric gratings and photonic crystals (PC) are computed on the basis of 
modified matrix Riccati equation in the wavelength range of near IR spectrum 
up to millimeter wavelength region. It is show that (1) PCs composed of Si rods 
(square lattice of a period 20 mcm and 10 mcm in rods diameter) have an 
opaque band around 100 mcm in their transmission spectra. A metallization of 
Si rods with Ag layer (0.1 mcm thickness) allow PCs function as an efficient  
mirror (reflection of 99%) for TE waves with wavelength greater than 50 mcm. 
(2) PCs composed of Si rods (period 3 mcm and 1 mcm in rods diameter) have 
two opaque bands 4.5 – 5.5 and 7 – 9 mcm in their transmission spectra. A 
transmission spike (6 mcm) is appeared in the main opaque band due to the 
absence of one rods layer. Both an amplitude and spectral width of the spike 
depends on the total amount of rod layers in the PC; (3) four  Si rod layers 
(1 mcm diameter, 3 mcm period) 
covered by 0.1 or 0.2 mcm Ag shell 
functions as an efficient mirror 
(reflection of  99%) for TE polarized 
wave with the wavelength greater than 
6.5 and 5.5 mcm, respectively; (4) PCs 
composed of Al2O3 or SiO2 rods have 
in their transmission spectra a PBG in 
the middle IR or millimeter regions 
providing that rods radii are equal to 
10 mcm or 1 mm, respectively; (5) PC 
of fused silica threads may function as 
an efficient mirror (reflection of 99%) 
in the near THz region (25 – 30 mcm, 
TE polarized wave); (6) single layer of 
Si threads (0.8947 mcm diameter, 
1.49 mcm period) may functions as narrow bandwidth spectral filter with broad 
angular tolerance around 1.55 mcm (see fig. 1). 
1.546 1.548 1.550 1.552
0.0
0.2
0.4
0.6
0.8
1.0
R
ef
le
ct
io
n
Wavelength, μm
 
Fig. 1. Calculated reflection efficiency from 
a single layer of Si threads with 0.8947 
mcm in diameter and period equal to 1.49 
(solid line) and 1.45 mcm (dashed line)  


Optical properties of periodic thread-like difraction gratings and photonic structures

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Optical properties of periodic thread-like difraction gratings and photonic structures

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