[COMSOL_Users] Effective mode area of HC-PCF in COMSOL

[s_sivab]

Dear COMSOL Users,

By calculating the Effective area of air core for different wavelength(800-1600 nm) in HC-PCF with COMSOL, the curve has many bumps with respect to wavelength. Could anybody can help on this, that I can understand what is the reason of the oscillations in the Effective area vs Wavelength plots of air core HC-PCF.

It will be very kind of you to replay,

With regards,
Aruna

[cpucampus]

Hi Aruna,

A hollow-core photonic crystal fiber (HC-PCF) may come in two types:
photonic bandgap PCF (PBG-PCF) and kagome lattice PCF. In the former, the
HC-PCF guides by virtue of its two-dimensional bandgaps, meaning the holey
cladding prevents light from escaping the hollow core. If your fiber is a
PBG-PCF, then it means it will guide light with low losses when the
wavelength of light is located inside one of its bandgaps, hence low losses
and a low effective mode area. When the wavelenght is outside the bandgaps,
the light tends to escape the core, hence higher losses and a high
effective area. I hope this helps.

cheers,

Bora

[s_sivab]

Dear COMSOL Users,

By simulation in COMSOL-RF Module-subdomian settings, how to increase the refractive index value of the gas inside the core of Hollow Core Photonic Crystal Fiber(HC-PCF). Because the refractive index value of any gas is nearly (RI = 1). And also how increase the pressure of the gas by simulation.

Many thanks if there is a replay.

With Regards,
Aruna

[marjan zakerin]

Hi Dear Aruna,

 The hyperelastic seal model in comsol library considers the effect of change in air pressure while pressing a membrane. It is in the solid mechanics library. But you can find some literature formalism which give you the change in dielectric constant as a function of change in the pressure. Such formalisms exists already for fluids.

Regards,
Marjan


________________________________
From: s_sivab <***@yahoo.com>
To: ***@yahoogroups.com
Sent: Friday, March 8, 2013 2:17 PM
Subject: [COMSOL_Users] How to Initiate gas refractive index value in core of HC-PCF


 


Dear COMSOL Users,

By simulation in COMSOL-RF Module-subdomian settings, how to increase the refractive index value of the gas inside the core of Hollow Core Photonic Crystal Fiber(HC-PCF). Because the refractive index value of any gas is nearly (RI = 1). And also how increase the pressure of the gas by simulation.

Many thanks if there is a replay.

With Regards,
Aruna