Photonic crystal Definition and 15 Threads

In 1D Photonic crystals, a defect can be introduced to create a defect/resonance mode and enable transmission. At first considerations, the thickness of the single defect layer determines the transmission frequency. Moreover, if it is a half-wavelength layer it will enable a resonance condition...

Im supposed to make model to demonstrate all-optical switching using a nonlinear effects of photonic crystals. And I will be using a directional coupler for this purpose. However I am having trouble in understanding the theory and concepts related to coupling / coupling length / use of...

hi, I'm currently talking about light, and I'm trying to find out if there is a material or a method that can flip a polariser's polarisation... ie, if i apply a current, then this crystal changed from a clockwize polariser to an anti-clockwize polariser, and it is either a plastic or elastic...

Hi, I'm Sungdae studying in Korea. In common, making a energy state in the photonic energy gap. but i don't know exactly what a different single-mode-cavity and 'single'-mode-cavity? Thanks

Hello! Does anybody know how to calculate the DOS as a function of Neff and λ/Λ? Thanks.

Hello! I know how to calculate band structure and density of states of photonic crystal (example is pic.1) Does anybody know how to plot such DOS maps? The second picture is from the article about photonic crystal fibers by Rodrigo Amezcua.

I have calculated the band structure of an infinite photonic crystal structure by COMSOL. So, I have an array of meanings of K-vector and different values of frequency V. I need to calculate density of states (DOS). How can I calculate it? Thanks.

I use transfer matrix method. I try to plot the phase Φ(ω) versus frequency ω graph in the vicinity of a band gap. The transmission coefficient t(ω) is t(ω) = |t(ω)|*exp(i*Φ(ω)) from which I get the transmission phase Φ(ω) = atan(t_imaginary(ω)/t_real(ω)). Since I assume that -pi/2 ≦ Φ ≦...

Need on urgent basis as to design supercell lattice of pcf

I have one hollow core fiber, the core is around 20um, Numerical Aperture is 0.03. The spot size of Ti:Sapphire laser is around 2~2.5mm. So I used focal length 50mm. But only very few power can be achieved (6uw). I wonder the reason. Could someone please give me some suggestions?

Hello everyone, I am trying to understand COMSOL 3.5 and I am interested in Photonic crystal fibres and tapered optical fibres. First of all, could you please tell me what is the background of the layout? When you create a design/object, the rest area is air or I need to define another object as...

Hi, I have this quite basic question regarding photonic crystals. As I understand, a periodic dielectric structure (photonic crystal) has modes (spatial profiles) at discrete frequencies from: \nabla \times \Big( \frac{1}{\epsilon(r)}\nabla \times H(r) \Big) = \frac{\omega^2}{c^2} H(r)...

Setup: I'm trying to make the band structure for a planar photonic crystal with finite thickness, i.e., a quasi-3D problem. I only want the x-direction band structure. So, I'm using variable floquet periodic BCs for the x-direction boundaries, and 0 degree floquet periodic BCs for the...

I've just read an article about IT with light instead of electrons: http://focus.aps.org/story/v22/st15 I wonder, is there any indication that light processing will be faster than conventional electronics? Information transport is faster, but what about logic operations? What would be...

Hi, Can someone tell me how a wave is guided (in a fiber for instance) thinking in term of diffraction (or scattering) and not in term of successive reflections. And my second question is : would it be possible to "extrude" a plan diffractive element in a fiber to guide wave and have the...