Enhancement of the reflection bands in ultraviolet region by using one-dimensional multi quantum well (MQW) photonic crystal (PC) structure has been investigated theoretically. The proposed structure is composed of three MgF2/SrTiO3 MQWs. The range of reflection band is investigated from the reflectance spectra of the one-dimensional MQW photonic crystal structure obtained by Transfer Matrix Method (TMM). From the numerical analysis it is observed that a range of reflection band for a single MQW PC is very narrow though it increases as the thickness of layers increases. But when three MQWs of MgF2/SrTiO3 are used we get much enlarged reflection band covering the range 119.8 nm-311.3 nm (reflectivity > 99%) with bandwidth 191.5 nm, for normal incidence. Further, we see that when the angle of incidence is increased, the width of reflection band increases in case of TE wave with a decrease for TM wave, because this omnidirectional reflection (ODR) band is very much narrow in UV region. We have computed ODR band upto incidence angle 50˚ for single as well as combined MQW PC. Analyzing the reflectance curve for incidence angle up to 50˚ for both TE and TM polarizations we find that by applying the combine MQW PC, omnidirectional reflection band increases significantly in comparison to single MQW structure. The proposed MQW photonic crystal structure is very useful in designing ultraviolet shielding for drugs, ultraviolet reflector for protecting damage of DNA and in skin diseases especially for skin cancer.
2. John, S., "Strong localization of photons in certain disordered dielectric superlattices," Phys. Rev. Lett., Vol. 58, 2486-2489, 1987.
3. Shawn, L. Y., J. G. Fleming, L. Robin, M. M. Sigalas, R. Biswas, and K. M. Ho, "Complete threedimensional photonic band gap in single cubic structure," J. Opt. Soc. Am. B, Vol. 18, 32-35, 2001.
4. Mishra, A., S. K. Awasthi, S. K. Srivastava, U. Malviya, and S. P. Ojha, "Tunable and omnidirectional filters based on one-dimensional photonic crystal composed of single negative materials," J. Opt. Soc. Am B, Vol. 8, 1416-1422, 2011.
5. Weiss, S. M., M. Haurylau, and P. M. Fauchet, "Tunable photonic bandgap structures for optical interconnects," Opt. Mater., Vol. 27, 740-745, 2005.
6. Srivastava, S. K. and S. P. Ojha, "Broadband optical reflector based on Si/SiO2 one-dimensional graded photonic crystal structure," J. Mod. Opt., Vol. 56, 33-40, 2009.
7. Yuan, K., X. Zheng, C.-L. Li, and W. L. She, "Design of omnidirectional and multiple channeled filters using one-dimensional photonic crystal containing a defect layer with a negative refractive index," Phys. Rev., Vol. E71, 066604-1-066604-5, 2005.
8. Srivastava, S. K., M. Upadhyay, S. K. Awasthi, and S. P. Ojha, "Tunable reflection bands and defect modes in one-dimensional tilted photonic crystal structure," Opt. Phot. J., Vol. 3A, 230-236, 2012.
9. Wu, C.-J. and Z. H. Wang, "Properties of defect modes in one-dimensional photonic crystal," Progress In Electromagnetics Research, Vol. 103, 169-184, 2010.
10. Liu, H. Y., et al., "Transmission of terahertz wave through one-dimensional photonic crystal containing single and multiple metallic defects," J. Appl. Phys., Vol. 110, 073101-1-073101-8, 2011.
11. Zhang, H. F., S. B. Liu, and X. K. Kong, "Defect mode properties of two-dimensional unmagnetized plasma photonic crystal with line defect under transverse magnetic mode," Acta Phys. Sin., Vol. 60, 025215, 2011.
12. Srivastava, S. K. and S. P. Ojha, "Omnidirectional reflection bands in one-dimensional photonic crystal structure using fullerene films," Progress In Electromagnetics Research, Vol. 74, 181-194, 2007.
13. Lee, H. Y. and T. Yao, "Design and evaluation of omnidirectional one-dimensional photonic crystals," J. Appl. Phys., Vol. 93, 819-830, 2003.
14. Srivastava, S. K., S. K. Awasthi, and S. P. Ojha, "A near infra-red optical reflector using onedimensional photonic crystal structure containing chalcogenide glasses," Opt. Electron. Lett., Vol. 6, 406-411, 2010.
15. Ansari, N. and M. M. Tehranchi, "Design of an omnidirectional band gap independent of ambient media refractive indices by using heterostructure magnetic photonic crystal," Appl. Phys. B, Vol. 99, 191-195, 2010.
16. Fekete, L., F. Kadlec, P. Kuzel, and H. Nemec, "Ultrafast opto-terahertz photonic crystal modulator," Optics Lett., Vol. 32, 680-682, 2007.
17. Srivastava, S. K. and S. P. Ojha, "Enhancement of omnidirectional reflection bands in onedimensional photonic crystal structure with left-handed materials," Progress in Electromagnetics Research, Vol. 68, 191-111, 2007.
18. Guan, H., et al., "Omnidirectional mirror for visible light based on one-dimensional photonic crystal," Chin. Opt. Lett., Vol. 9, 071603-1-071603-4, 2011.
19. Aly, A. H., W. Sabra, and H. A. Elsayed, "Dielectric and superconducting photonic crystal," J. Supercond. Nov. Magn., Vol. 26, 553-560, 2013.
20. Wu, C. J. and H. C. Lin, "Investigation of photonic band gap in semiconductor-organic photonic crystal in ultraviolet region," Opt. Rev., Vol. 18, 338-342, 2011.
21. Banaei, H. A. and F. A. Mehdizadeh, "Proposal for anti-UVB filter based on one-dimensional photonic crystal structure," Digest J. Nanomat. and Biostrct., Vol. 1, 367-371, 2012.
22. Aly, A. H., H. A. Elsayed, W. Sabra, and A. Mehaney, "Ternary metallic-dielectric photonic crystals within ultraviolet wavelengths," J. Mod. Phys. Appl., Vol. 2, 1-20, 2013.
23. Yeh, P., Optical Waves in Layered Media, 118-125, John Wiley & Sons, New York, 1988.
24. Born, M. and E. Wolf, Principles of Optics, 4th Edition, 58–68, Pergamon, Oxford, 1970.