Detection of Fat Concentration in Milk Using Ternary Photonic Crystal

Rapid and sensitive detection of fat concentration in milk is a necessary part for citizens in each country. Bio-photonic sensing techniques are an accurate best way to detect biosensing measurements. The main aim of the proposed device is to make a more effective sensor to detect fat concentration in milk. A novel bio-photonic sensor based on the ternary photonic crystal of porous silicon is proposed. The key factor used here is that the dielectric constant of the milk depends strongly on the fat concentration. The proposed structures are (A) asymmetric ternary photonic crystal: (PSi 1 /PSi 2 /PSi 3 ) N /Sample/(PSi 1 /PSi 2 /PSi 3 ) N substrate, and (B) symmetric ternary photonic crystal: (PSi 1 /PSi 2 /PSi 3 ) N /Sample/(PSi 3 /PSi 2 / PSi 1 ) N substrate. PSi and N denote to porous silicon layer and the number of layers, respectively. The numerical calculations for the proposed structure are calculated by using the transfer matrix method. Our biosensor is more efficient than some of the available sensors to sense the fat concentration in milk.