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Transmission comb of a distributed Bragg reflector with two surface dielectric gratings.

Zhao X, Zhang Y, Zhang Q, Zou B, Schwingenschlogl U - Sci Rep (2016)

Bottom Line: The transmission peaks can be narrower than 0.1 nm and are fully separated from each other in certain wavebands.We further prove that the transmission combs are robust against randomness in the heights of the DBR layers.Therefore, the proposed structure is a candidate for an ultra-narrow-band multichannel filter or polarizer.

View Article: PubMed Central - PubMed

Affiliation: Beijing Key Lab of Nanophotonics &Ultrafine Optoelectronic Systems and School of Physics, Beijing Institute of Technology, Beijing 100081, China.

ABSTRACT
The transmission behaviour of a distributed Bragg reector (DBR) with surface dielectric gratings on top and bottom is studied. The transmission shows a comb-like spectrum in the DBR band gap, which is explained in the Fano picture. The number density of the transmission peaks increases with increasing number of cells of the DBR, while the ratio of the average full width at half maximum to the corresponding average free spectral range, being only few percent for both transversal electric and magnetic waves, is almost invariant. The transmission peaks can be narrower than 0.1 nm and are fully separated from each other in certain wavebands. We further prove that the transmission combs are robust against randomness in the heights of the DBR layers. Therefore, the proposed structure is a candidate for an ultra-narrow-band multichannel filter or polarizer.

No MeSH data available.


Related in: MedlinePlus

Variation of the sum TTE + TTM with the wavelength of the incident beam for different numbers of cells.The line colour represents the transmission polarization ( nm, fg = 0.5, and  nm).
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f5: Variation of the sum TTE + TTM with the wavelength of the incident beam for different numbers of cells.The line colour represents the transmission polarization ( nm, fg = 0.5, and  nm).

Mentions: where and represent the transmissivities of the TE and TM waves, respectively. The polarization is represented by the line colour in Fig. 5 where we plot . In certain regions the transmission peaks of the TE and TM waves are fully separated from each other, for examples in the wavebands  nm in Fig. 5(a),  nm in Fig. 5(b), and  nm in Fig. 5(d). By Eq. (6), these polarized wavebands can be shifted by controlling the grating period and therefore the G/DBR/G can serve as a multichannel polarizer.


Transmission comb of a distributed Bragg reflector with two surface dielectric gratings.

Zhao X, Zhang Y, Zhang Q, Zou B, Schwingenschlogl U - Sci Rep (2016)

Variation of the sum TTE + TTM with the wavelength of the incident beam for different numbers of cells.The line colour represents the transmission polarization ( nm, fg = 0.5, and  nm).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4759698&req=5

f5: Variation of the sum TTE + TTM with the wavelength of the incident beam for different numbers of cells.The line colour represents the transmission polarization ( nm, fg = 0.5, and  nm).
Mentions: where and represent the transmissivities of the TE and TM waves, respectively. The polarization is represented by the line colour in Fig. 5 where we plot . In certain regions the transmission peaks of the TE and TM waves are fully separated from each other, for examples in the wavebands  nm in Fig. 5(a),  nm in Fig. 5(b), and  nm in Fig. 5(d). By Eq. (6), these polarized wavebands can be shifted by controlling the grating period and therefore the G/DBR/G can serve as a multichannel polarizer.

Bottom Line: The transmission peaks can be narrower than 0.1 nm and are fully separated from each other in certain wavebands.We further prove that the transmission combs are robust against randomness in the heights of the DBR layers.Therefore, the proposed structure is a candidate for an ultra-narrow-band multichannel filter or polarizer.

View Article: PubMed Central - PubMed

Affiliation: Beijing Key Lab of Nanophotonics &Ultrafine Optoelectronic Systems and School of Physics, Beijing Institute of Technology, Beijing 100081, China.

ABSTRACT
The transmission behaviour of a distributed Bragg reector (DBR) with surface dielectric gratings on top and bottom is studied. The transmission shows a comb-like spectrum in the DBR band gap, which is explained in the Fano picture. The number density of the transmission peaks increases with increasing number of cells of the DBR, while the ratio of the average full width at half maximum to the corresponding average free spectral range, being only few percent for both transversal electric and magnetic waves, is almost invariant. The transmission peaks can be narrower than 0.1 nm and are fully separated from each other in certain wavebands. We further prove that the transmission combs are robust against randomness in the heights of the DBR layers. Therefore, the proposed structure is a candidate for an ultra-narrow-band multichannel filter or polarizer.

No MeSH data available.


Related in: MedlinePlus