Abstract
A self-aligned photonic coupler, consisting of a tapered fiber and a suspended rectangular waveguide, is presented as a new approach for optical interfacing from SMF fiber domain to integrated photonic domain. The alignment occurs due to optical forces and a theoretical maximum transmitance of -1.4dB as well as significant attractive optical force range of 1.25μm for 1mW of input power are demonstrated. For a non-optimized geometry of 660nm taper diameter and 240x220nm waveguide, this result already matches transmitance for typical approaches for this interfacing with advantages of coarser alignment complexity and polarization and bandwidth flexibility.
Highlights
Optical forces originate by radiation pressure and dipole induction on dielectric materials under strongly varying electromagnetic field profile
In this project we explore this fenomena to tackle a technical challenge in photonics: the optical interfacing between the optical fiber domain and the integrated photonics domain
It can be seen that for a range of one micron the attractive optical force can result in accelerations of tens of g’s – gravity acceleration
Summary
Optical forces originate by radiation pressure and dipole induction on dielectric materials under strongly varying electromagnetic field profile. In this project we explore this fenomena to tackle a technical challenge in photonics: the optical interfacing between the optical fiber domain (mode diameter of tens of micrometers) and the integrated photonics domain (mode diameter of hundreds of nanometers). Image 1, we show the acceleration map, due to the optical force, for a horizontally polarized input mode. It can be seen that for a range of one micron the attractive optical force can result in accelerations of tens of g’s – gravity acceleration. Acceleration in g’s (g=9.8m/s2) for a silica cylindrical rod under the optical force for 1mW of input power. For a distance of 1.25μm the optical force corresponds to 1g and is rapidly increasing as q decreases
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