|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Development of a low cost, high resolution position detection system for photonic force microscopy | | Sambit Bikas Pal
; Arijit Haldar
; Basudev Roy
; Ayan Banerjee
; | | Date: |
18 Jul 2011 | | Abstract: | A photonic force microscope comprises of an optically trapped micro-probe and
a position detection system to track the motion of the probe. In this paper, we
report the use of the optical pick-up head of a compact disc player as an
extremely low cost yet accurate position sensor for photonic force microscopy.
The size of the quadrant photo-IC in the pick-up head makes it ideal to work
with a 1:1 image of a micron-sized probe in the microscope back-focal plane
after the standard magnification by the trapping objective lens. This is an
advantage over most commercial quadrant photodiodes or position sensitive
detectors where it is difficult to image only the probe since such detectors
require larger beams. This warrants external magnification optics leading to
losses that may be significant in back-focal plane detection where the signal
level directly off the probe is already very weak. Using a commercially
available spare pick-up head, we demonstrate that the detector could measure
absolute displacements with a resolution of $sim$10 nm over a bandwidth of 10
Hz at 95% significance without any sample or laser stabilization. It has a
linear response range of around 385 nm with crosstalk between axes $simeq 4$%
for optically trapped 1.1 {$
m mu$}m beads. We characterized our optical trap
for different sizes beads and found that for 1.1 $mu$ diameter beads, the
noise in our position measurement matched the thermal resolution limit for an
averaging time of 10 ms. The detector is fast, of small size and low cost -
factors that can lead to it’s widespread use in photonic force microscopy. | | Source: | arXiv, 1107.3427 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER