ﺧﻮاص اﭘﺘﯿﮑﯽ ﺑﻠﻮر ﻓﻮﺗﻮﻧﯿﮑﯽ دياﻟﮑﺘﺮﯾﮏ ﺗﮏ ﺑﻌﺪي ﺷﺒﻪ ﻓﻠﺰ ـ دياﻟﮑﺘﺮﯾﮏ

Optical properties of one dimensional quasi metaldielectric photonic crystal

در اﯾﻦ ﻣﻘﺎﻟﻪ ﺑﻪ ﺑﺮرﺳﯽ رﻓﺘﺎر ﺑﻠﻮر ﻓﻮﺗﻮﻧﯿﮑﯽ ﺗﮏ ﺑﻌﺪي ﺷﺒﻪ ﻓﻠﺰ ـ دياﻟﮑﺘﺮﯾﮏ ﺑﺎ ﺳﺎﺧﺘﺎر اﭘﺘﯿﮑﯽ ﺑﺎ ﺗﺮﺗﯿﺐ ﻟﺎﯾﻪﻫﺎ ﺑﻪ ﺻﻮرت Glass/(MgF2-Ge)N/Air ﭘﺮداﺧﺘﻪ ﺷﺪه اﺳﺖ. ﺷﺒﯿﻪﺳﺎزي اﯾﻦ ﺑﻠﻮر اﻧﺠﺎم ﺷﺪ و ﻃﯿﻒ ﻋﺒﻮري آن رﺳﻢ ﮔﺮدﯾﺪ. ﻃﺒﻖ ﻣﺤﺎﺳﺒﺎت ﺷﺒﯿﻪﺳﺎزي ﺷﺪه و رﺳﻢ ﻧﻤﻮدار ﻃﯿﻒ ﻋﺒﻮري، اﯾﻦ ﺳﺎﺧﺘﺎر داراي ﺷﮑﺎف ﺑﺎﻧﺪ ﻓﻮﺗﻮﻧﯿﮑﯽ ﭘﻬﻦ ﺑﻮده اﺳﺖ و ﻫﻤﭽﻨﯿﻦ ﻃﻮل ﻣﻮج ﻣﺮﮐﺰي آن ﺑﺎ اوﻟﯿﻦ ﺗﻮﻗﻒ ﺑﺎﻧﺪ آن ﺑﺎ ﺷﺮط ﺑﺮاگ ﺗﻄﺎﺑﻖ ﺧﻮﺑﯽ دارد. ﺑﺎ اﻓﺰاﯾﺶ زاوﯾﻪ ﺗﺎﺑﺶ ﻧﻮر ﻓﺮودي، ﭘﻬﻨﺎي ﺑﺎﻧﺪ ﻗﻄﺒﯿﺪﮔﯽ P ﮐﺎﻫﺶ ﯾﺎﻓﺘﻪ اﺳﺖ و دو ﻗﻄﺒﯿﺪﮔﯽ S و P از ﯾﮑﺪﯾﮕﺮ ﺟﺪا ﻣﯽﺷﻮﻧﺪ. اﻓﺰاﯾﺶ ﺗﻌﺪاد ﺗﻨﺎوب، ﭘﻬﻨﺎي ﺷﮑﺎف ﺑﺎﻧﺪ را ﺗﻐﯿﯿﺮ ﻧﻤﯽدﻫﺪ وﻟﯽ ﻣﯽﺗﻮاﻧﺪ ﻋﻤﻖ ﺷﮑﺎف ﺑﺎﻧﺪ را زﯾﺎد ﮐﻨﺪ. ﻫﻤﭽﻨﯿﻦ ﺑﺎ اﻓﺰاﯾﺶ ﻓﺎﮐﺘﻮر اﻧﺒﺎﺷﺖ )ﺿﺮﯾﺐ ﺗﻌﺪاد ﻟﺎﯾﻪﻫﺎ در ﻫﺮ ﺑﺨﺶ(، ﺷﮑﺎف ﺑﺎﻧﺪ ﻓﻮﺗﻮﻧﯿﮑﯽ اﻓﺰاﯾﺶ ﯾﺎﻓﺘﻪ اﺳﺖ و در ﻧﺘﯿﺠﻪ ﺑﻪ ﺳﻤﺖ ﻃﻮل ﻣﻮجﻫﺎي ﺑﻠﻨﺪﺗﺮ اﻧﺘﻘﺎل ﭘﯿﺪا ﻣﯽﮐﻨﺪ.

in this paper, the behavior of one dimensional quasi metal-dielectric photonic crystal with the structure of Glass/ (MgF2-Ge)N /Air was investigated. According to simulation calculations and by Charting of the transmission spectrum, the photonic band gap of this structure is wide, also its central wavelength with the band's first stop is in good agreement with the Bragg condition. By increasing the angle of the incident light radiation, the bandwidth of P polarization decreases and the two polarization S and P are separated. Increasing the number of frequencies, wide band gap does not change, but its depth increases. Also by increasing filling factor, photonic band gap has increased and is shifted towards longer wavelengths.