Speaker: Ms. Parna Roy 

Research Supervisor: Prof. Anshu Pandey

TopicPhotonic Crystal: Principles and Applications 

Date & Time: Thursday, 8th September, 2022 at 4:00 PM 

Venue: SSCU Auditorium 



Photonic crystals are the periodic electromagnetic media having periodicity with respect to dielectric constant of materials. Propagation of wave inside a photonic crystal is governed by Maxwell’s electromagnetic theory. Achieving a complete photonic band gap depends on lattice structure, symmetry, direction of propagation, polarization of light etc. 1

In my seminar I will talk about the origin of photonic band gap by applying T-matrix method for a periodic multilayer structure and its relationship with the reflectance for 1D photonic crystal of infinite as well as finite thickness.1 Then I will discuss about how to get a complete 2D band gap with respect to structural symmetry and dielectric arrangement type. I will conclude it by discussing several applications of it like photonic crystal fibre2,3, photonic crystal LASER4, super prisms, add and drop filters, gas sensor.5




1) Joannopolous, J. D.; Johnson, S. G.; Winn, J. N.; Meade, R. D.; 2008, Photonic crystal-molding the flow of light, Princeton university press.


2) Cregan, R. F.; Mangan, B. J.; Knight, J. C.; Brisks, T. A.; Russell, P. ST. J.; Roberts, P. J.; Allan, D. C. Single-mode photonic band gap guidance of light in air. Science 285, 1537–1539 (1999).


3)Humbert, G.; Knight, J. C.; Bouwmans, G.; Russell, P. ST. J.; Williams, D. P.; Roberts, P. J.; Mangan, B. J. Hollow core photonic crystal fibers for beam delivery. Opt express 12, 1477-1484 (2004).


4) Colombelli, R.; Srinivasan, K.; Troccoli, M.; Painter, O.; Gmachl, C. F.; Tennant, D. M.; Sergent, A. M.; Sivco, D. L.; Cho, A. Y.; Capasso, F. Quantum Cascade Surface-Emitting Photonic Crystal Laser. Science 302, 1374 (2003).


5) Troia, B.; Paolicelli, A.; De Leonardis, F.; Passaro, V. Photonic crystals for optical sensing: A review. Adv. Photonic Cryst. 2013, 241–295.