Crossover from spherical particle Mie scattering to circular aperture diffraction

2014 ◽  
Vol 31 (11) ◽  
pp. 2362 ◽  
Author(s):  
William R. Heinson ◽  
Amitabha Chakrabarti ◽  
Christopher M. Sorensen
2002 ◽  
Vol 41 (18) ◽  
pp. 3545 ◽  
Author(s):  
I. Wayan Sudiarta ◽  
Petr Chýlek

ISRN Optics ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Svetlana N. Khonina ◽  
Andrey V. Ustinov

Theoretical and numerical analysis of the transmission function of the focusing system with high numerical aperture was conducted. The purpose of the study was to form a thin light tube in a focal area using the azimuthally polarized radiation. It was analytically shown that, due to destructive interference of two beams formed by two narrow rings, it is possible to overcome not only the full aperture diffraction limit but also the circular aperture limit. In this case, however, the intensity at the center of the focal plane is significantly reduced, which practically leads to the tube rupture. It was numerically shown that long thin one-piece tubes may be formed through the aperture apodization with diffractive axicon phase function or with complex transmission function of Laguerre-Gaussian or Airy-Gaussian beams.


2019 ◽  
Vol 4 (2) ◽  
pp. 131-141
Author(s):  
Freinademetz Anggur ◽  
Ali Warsito ◽  
Albert Zicko Johannes ◽  
Andreas Christian Louk

Abstrak  Telah dilakukan penelitian tentang   komputasi numerik model integratif pada difraksi celah lingkaran dengan tujuan untuk menerapkan metode simpson 1/3 untuk mencari solusi kasus difraksi celah lingkaran, menghitung nilai integrasi bessel menggunakan metode simpson 1/3, menentukan jarak antara dua intensitas pada pita terang, memperoleh grafik pola intensitas cahaya terhadap jarak pada kasus difraksi celah berbentuk lingkaran. Hasil integrasi yang diperoleh dengan metode simpson 1/3  pada tiga titik puncak intensitas  yaitu 0.14352548, -0.3342371, 0.27050545 Dari hasil perhitungan pada puncak pertama untuk intensitas maksimum pada terang pusat yang berada pada jarak 0.3 cm dengan nilai intensitas 0.91553621, puncak kedua pada jarak 5.1 cm dengan nilai intensitas 0.01718022 dan pucak ketiga pada jarak 8.6 cm dengan nilai intensitas 0.00395745. Dari hasil perhitungan diperoleh grafik antara jarak dengan intensitas sehingga terdapat pola yang membentuk cincin gelap terang semakin besar panjang gelombang sumber maka semakin besar pula jarak antara suatu titik intensitas dari intensitas maksimum. Hasil perhitungan menunjukkan bahwa pendekatan integrasi simpson 1/3 hampir mendekati hasil yang telah diperoleh secara analitik. Dari hasil ini dapat dihitung nilai error dari program terhadap nilai eksak secara analitik dan diperoleh nilai pendekatan yang kecil yaitu -7.95 x 10-6, -6.07 x 10-6, 2.25 x 10-6. Sehingga hasil pendekatan dengan metode Simpson dapat diterima serta dapat dikatakan bahwa program yang dibuat telah berfungsi dengan baik.  Kata kunci: Bessel; metode Simpson 1/3; difraksi celah lingkaran.   Abstract  [Numerical Computation Study Of Integrative Models In The Circular Aperture Diffraction With Simpson 1/3 Approach Method] Research on numerical computation of integrative models on the circular aperture diffraction with the aim to apply the Simpson 1/3 method to find a solution to the circular aperture diffraction case, calculate the integration value of the Bessel using the Simpson 1/3 method, determine the distance between two intensities on the bright band, obtain graph of the pattern of light intensity versus distance in the case of circular slit diffraction. The integration results obtained by the Simpson method at three intensity peaks are 0.14352548, -0.3342371, 0.27050545 From the results of the calculation at the first peak for maximum intensity at the center of light at a distance of 0.3 cm with an intensity value of 0.91553621, the second peak at a distance of 5.1 cm with an intensity value of 0.01718022 and a third peak at a distance of 8.6 cm with an intensity value of 0.00395745. From the calculation results obtained by the graph between the distance with intensity so that there is a pattern that forms a dark ring of light the greater the source wavelength, the greater the distance between an intensity point from the maximum intensity. The calculation results show that the Simpson 1/3 integration approach is almost close to the results that have been obtained analytically. From these results, an error value from the program can be calculated analytically and the exact value of the approach obtained is -7.95 x 10-6, -6.07 x 10-6, 2.25 x 10-6. So the results of the approach with the Simpson 1/3 method can be accepted and it can be said that the program created has functioned well.  Keywords: Bessel;  Simpson 1/3methods;  circular aperture diffraction.


2014 ◽  
Vol 118 (11) ◽  
pp. 2083-2088 ◽  
Author(s):  
Bernard J. Mason ◽  
Jim S. Walker ◽  
Jonathan P. Reid ◽  
Andrew J. Orr-Ewing

2000 ◽  
Vol 185 (4-6) ◽  
pp. 233-237 ◽  
Author(s):  
M.A. Cervantes ◽  
A.A. Lipovka ◽  
M.M. Tavares

1984 ◽  
Vol 75 ◽  
pp. 607-613 ◽  
Author(s):  
Kevin D. Pang ◽  
Charles C. Voge ◽  
Jack W. Rhoads

Abstract.All observed optical and infrared properties of Saturn's E-ring can be explained in terms of Mie scattering by a narrow size distribution of ice spheres of 2 - 2.5 micron diameter. The spherical shape of the ring particles and their narrow size distribution imply a molten (possibly volcanic) origin on Enceladus. The E-ring consists of many layers, possibly stratified by electrostatic levitation.


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