photosensitive glass
{{Short description|Clear glass with microscopic metal particles sensitive to UV light}}
File:Photosensitive glass vase.jpg
Photosensitive glass, also called photostructurable glass (PSG) or photomachinable glass, is a glass in the lithium-silicate family of glasses onto which images can be etched using shortwave radiations, such as ultraviolet.{{cite journal | doi = 10.1016/0167-9317(95)00295-2 | volume=30 | issue=1–4 | title=Fabrication technologies for microsystems utilizing photoetchable glass | journal=Microelectronic Engineering | pages=497–504| year=1996 | last1=Dietrich | first1=T.R | last2=Ehrfeld | first2=W | last3=Lacher | first3=M | last4=Krämer | first4=M | last5=Speit | first5=B }} Photosensitive glass was first discovered by S. Donald Stookey in 1937.Paul, p. 333Encyclopædia Britannica, pp. 194–209Maluf, pp. 62–63
Exposure process
When the glass is exposed to UV light with wavelengths between 280 and 320 nm, a latent image is formed. The glass remains transparent at this stage, but its ability to absorb UV light increases. This increased absorption is only detectable using UV transmission spectroscopy and is caused by an oxidation–reduction reaction that occurs inside the glass during exposure. This reaction causes cerium ions to oxidize to a more stable state, and silver ions are reduced to silver.{{cite web |url=https://sites.google.com/site/khalidtantawi/photosensitive-glass |url-status=dead |archive-url=https://web.archive.org/web/20201124013341/https://sites.google.com/site/khalidtantawi/photosensitive-glass |archive-date=2020-11-24 |title=Fabricating Microfluidic Structures from Photodefinable Glass |author=Khalid Tantawi |publisher=Google Sites}}
Post-exposure heat treatment
The latent image captured in the glass is made visible by heating.{{cite journal |url=https://iopscience.iop.org/article/10.1088/0960-1317/21/1/017001 |title=Processing of photosensitive APEX glass structures with smooth and transparent sidewalls |author=Khalid H. Tantawi, Janeczka Oates, Reza Kamali, Nathan Bergquist, John D. Williams |journal=J. Micromech. Microeng. |volume=21 |pages=017001 |year=2011 |doi=10.1088/0960-1317/21/1/017001|url-access=subscription }} This heat treatment is done by raising the temperature to about 500 °C to allow the oxidation–reduction reaction to form silver nanoclusters. Following this, the temperature is raised to 550–560 °C, and lithium metasilicate (Li2SiO3) forms on the silver nanoclusters. This material forms in the crystalline phase.
HF chemical etching
The lithium metasilicate in the exposed regions of the glass can be etched by hydrofluoric acid (HF). This forms glass microstructures with a roughness in the range of 5 μm, resulting in a three-dimensional image of the mask to be produced. {{clarify span|to 0.7 μm.|date=March 2025}}
See also
References
{{reflist}}
=Bibliography=
- Encyclopædia Britannica, The New Encyclopædia Britannica, v.8 Macropaedia Ge-Hu, Encyclopædia Britannica, 1974, {{ISBN|0-85229-290-2}}
- Parker, Sybil P., Dictionary of Scientific and Technical Terms. McGraw-Hill Companies, Inc., (2003) - "photosensitive glass," {{ISBN|0-07-042313-X}},
- Maluf, Nadim et al., Introduction to Microelectromechanical Systems Engineering, Artech House, 2004, {{ISBN|1-58053-590-9}}
- Paul, Amal, Chemistry of Glasses, Springer, 1990, {{ISBN|0-412-27820-0}}
- Stookey, S. Donald, Journey to the Center of the Crystal Ball : An Autobiography, American Ceramic Society (1985), {{ISBN|0-916094-69-3}}
- Stookey, S. Donald, Explorations in Glass: An Autobiography, Wiley-Blackwell (2000), {{ISBN|1-57498-124-2}}
External links
{{Glass science}}
{{Authority control}}
{{DEFAULTSORT:Photosensitive Glass}}