Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nanofiber based displacement sensor   We report on the realization of a displacement sensor based on an optical
nanofiber. A single gold nano-sphere is deposited on top of a nanofiber and the
system is placed within a standing wave which serves as a position ruler.
Scattered light collected within the guided mode of the fiber gives a direct
measure of the nanofiber displacement. We calibrated our device and found a
sensitivity up to 1.2~nm/$\sqrt{\text{Hz}}$. A mechanical model based on the
Mie scattering theory is then used to evaluate the optically induced force on
the nanofiber by an external laser. With our sensing system, we demonstrate
that an external force of 1~pN applied at the nanofiber waist can be detected.

29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
2
The categories of this paper are: math