Fabrication and characterization of optical nanofiber interferometer and resonator for the visible range

Abstract

We report the fabrication and characterization of photonic structures using tapered optical nanofibers. Thanks to the extension of the evanescent electromagnetic field outside of the nanofiber two types of devices can be built: a ring interferometer and a knot resonator. We propose a general approach to predict the properties of these structures using the linear coupling theory. In addition, we describe a new source of birefringence due to the ovalization of a nanofiber under strong bending, known in mechanical engineering as the Brazier effect.

Optical trap for an atom around the midpoint between two coupled identical parallel optical nanofibers

“…Coupled waveguides play an important role in numerous optical devices such as multicore fibers, optical directional couplers, polarization splitters, ring resonators, and interferometers [22][23][24]. Recently, optical devices comprising of twisted or knotted nanofibers have been fabricated [25]. Coupling between two nanofibers has been studied [25,26] in the framework of the coupled mode theory [22][23][24].…”

“…Recently, optical devices comprising of twisted or knotted nanofibers have been fabricated [25]. Coupling between two nanofibers has been studied [25,26] in the framework of the coupled mode theory [22][23][24]. It has been shown that the guided normal (array) modes of two coupled dielectric rods can be calculated by using the circular harmonics expansion [27].…”

Vapor Sensing with Polymer Coated Straight Optical Fiber Microtapers Based on Index Sensitive Interference Spectroscopy of Surface Stress Birefringence

“…Sensing using optical methods has been an active field of research in recent years [1][2][3], due to the inherently superior capabilities offered by complex photonic structures [4,5]. Specifically, microstructures incorporated within optical fiber tapers transmitting near-infrared (NIR) light have found comprehensive applications in a variety of sensing scenarios, including in liquid [6][7][8][9], gas [10,11], and other physical [12][13][14][15][16] and chemical [17,18] media.…”

Nanofiber based displacement sensor

“…The optical nanofiber is an air-cladding guiding system with subwavelength diameter, which allows light to be transmitted outside the fiber in the form of evanescent field. In the recent years, the optical properties of nanofibers have been widely used for atomic fluorescence investigation [14], atom trapping [15,16], quantum optics and quantum information [17], chiral quantum optics [18], and optical resonators [19].…”