ANALYSIS OF PERIODIC GRATINGS WITH DEFECTS IN THE FORM OF ABSENCE OF A SINGLE STRIP

2017 ◽  
Vol 76 (6) ◽  
pp. 461-467
Author(s):  
M. E. Kaliberda ◽  
S. A. Pogarsky ◽  
A. V. Poznyakov
Keyword(s):  
Single Strip ◽  
Periodic Gratings

scholarly journals Non-steady-state double-resonant extremely asymmetrical scattering of waves in periodic gratings

2003 ◽  
Vol 310 (2-3) ◽  
pp. 214-222
Author(s):  
Dmitri K. Gramotnev ◽  
Timo A. Nieminen
Keyword(s):  
Steady State ◽  
Periodic Gratings

Effects of structure parameters on high-order diffraction suppression of quasi-periodic gratings

2018 ◽  
Vol 35 (4) ◽  
pp. 711 ◽  
Author(s):  
Tanchao Pu ◽  
Ziwei Liu ◽  
Lina Shi ◽  
Guanya Wang ◽  
Jiebin Niu ◽  
...  
Keyword(s):  
High Order ◽  
Structure Parameters ◽  
Order Diffraction ◽  
Periodic Gratings

Resonant effects in periodic gratings comprising a finite number of grooves in each period

2001 ◽  
Vol 64 (1) ◽  
Author(s):  
Angela N. Fantino ◽  
Susana I. Grosz ◽  
Diana C. Skigin
Keyword(s):  
Finite Number ◽  
Periodic Gratings

scholarly journals Spectral Fourier-microscopy of the periodic structures based on Ge2Sb2Te5

2021 ◽  
Vol 2103 (1) ◽  
pp. 012173
Author(s):  
A I Solomonov ◽  
S I Pavlov ◽  
P I Lazarenko ◽  
V V Kovalyuk ◽  
A D Golikov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Reasonable Agreement ◽  
Angular Resolution ◽  
Periodic Structures ◽  
Diffraction Gratings ◽  
Dispersion Curves ◽  
Reflection Spectra ◽  
Waveguide Modes ◽  
Periodic Gratings

Abstract The method of spectral Fourier microscopy was used to study the reflection spectra with an angular resolution of submicron periodic gratings based on amorphous and crystalline Ge2Sb2Te5. The form of the dispersion curves of quasi-waveguide modes in the structures under study was established. The experimental data were compared with the calculations of dispersion curves in synthesized diffraction gratings. Reasonable agreement between theoretical and experimental data was obtained.

Experimental analysis on thermal and friction factor characteristics of fluid flow in tube with novel double strip helical screw tape

2019 ◽  
Vol 234 (6) ◽  
pp. 874-886
Author(s):  
Shashank R Chaurasia ◽  
RM Sarviya
Keyword(s):  
Nusselt Number ◽  
Fluid Flow ◽  
Friction Factor ◽  
Experimental Analysis ◽  
Flow Characteristics ◽  
Performance Ratio ◽  
Working Fluid ◽  
Flow Rates ◽  
Twist Ratio ◽  
Single Strip

An experimental analysis has been carried out to investigate the thermal and friction factor characteristics of fluid flow in a tube with double strip helical screw tape (DS-HST) inserts with different values of twist ratio and compared with single strip helical screw tape inserts and plain tube. Water is used as a working fluid at different flow rates with constant heat flux conditions. CFD analysis is also carried out to visualize thermal and fluid flow characteristics of fluid flow in tube with inserts. Experimental results have showed that Nusselt number and friction factor have attained excellent enhancement with double strip helical screw tape inserts in the range of flow rates than single strip helical screw tape inserts at the value of twist ratio 1.5. Correlation is also developed for Nusselt number with a range of Reynolds number, twist ratio and number of strips. Moreover, the performance ratio has attained maximum value at twist ratio of 2.5 with high values of flow rate. It is concluded that DS-HST is able to attain enhancement in the efficiency of heat exchanger, causing a reduction in size for thermal applications.

Quantum dot-based optically pumped VCSELs with high-contrast periodic gratings

2019 ◽  
Author(s):  
Tibor Fordos ◽  
Edmund Clarke ◽  
Pallavi Patil ◽  
Robert J. Airey ◽  
Nasser Babazadeh ◽  
...  
Keyword(s):  
Quantum Dot ◽  
High Contrast ◽  
Optically Pumped ◽  
Periodic Gratings
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