Voltage sensitive dyes technique: 2-photons microscopy vs confocal microscopy?

Why a two-photon microscopy is better than a confocal microscopy?

As described above, two-photon excitation is more effective than confocal microscopy in thick samples for several reasons: scattered excitation light does not excite any fluorescence, scattering fluorescence emission can still be detected, and infrared wavelengths scatter less than visible wavelengths.

Does confocal microscopy use dyes?

Traditional Fluorescent Dyes

The most popular lasers for confocal microscopy are air-cooled argon and krypton-argon ion lasers, the new blue diode lasers, and a variety of helium-neon systems.

What is two-photon fluorescence microscopy?

Two-photon excitation microscopy (TPEF or 2PEF) is a fluorescence imaging technique that allows imaging of living tissue up to about one millimeter in thickness, with 0.64 μm lateral and 3.35 μm axial spatial resolution.

How does a two-photon microscope work?

In two-photon microscopy—the most common form of multiphoton microscopy—two photons are absorbed by the label at virtually the same instant. Multiphoton microscopy also uses longer-wavelength photons, which are lower energy and penetrate more deeply, creating less tissue damage while imaging farther into a sample.

What is the most used microscope?

Compound Light Microscope

Compound Light Microscope
A compound microscope is the most common type of microscope used today, which mechanism is explained earlier. It is basically a microscope that has a lens or a camera on it that has a compound medium in between. This compound medium allows for magnifications in a very fine scale.

Is a confocal microscope a light microscope?

Light travels through the sample under a conventional microscope as far into the specimen as it can penetrate, while a confocal microscope only focuses a smaller beam of light at one narrow depth level at a time. The CLSM achieves a controlled and highly limited depth of field.

Confocal Microscopy
OPS-301 code 3-301

What is the resolution of two-photon microscopy?

STED microscopy has been done with two-photon excitation and has achieved a spatial resolution of ~60 nm in optical systems with two lasers [13–15] and a single laser [16,17]. However, the imaging depth of two-photon STED microscopy is still limited to being less than ~100 µm.

What is multi photon microscopy?

Multiphoton microscopy is a powerful tool for visualizing cellular and subcellular events within living tissue with its inherent “optical sectioning” capability, deeper penetration and minimal phototoxicity and photobleaching. Multiphoton microscopy can capture whole organisms or embryos on a large scale.