A research team, mainly formed of professors and students from National Tsing Hua University, yesterday introduced the latest breakthrough into research on the smallest plasmonic nanolaser ever developed, which can theoretically transmit 1,000 times faster than the present series of semiconductor lasers.
The discovery was published in this week’s edition of Science magazine, one of the world’s most prestigious science journals.
The team consists of 15 researchers and doctoral students, eight of whom are from National Tsing Hua University with their research being funded by the National Science Council. The others are from the US and China.
Photo: Tang Chia-ling, Taipei Times
Felix Gwo (果尚志), a professor at the university’s department of physics, said worldwide research and development into semiconductor lasers began about 50 years ago, however, efforts to improve transmission speeds have hit a bottleneck in which its size cannot be reduced any further, due to the physical limitations of the Abbe Diffraction Limit.
“Data transmitted through fiber-optic communication can be very fast, but when it reaches the computer and is processed in the central processing unit [CPU], the computing is still reliant on electrons [which limits the transmission speed],” Gwo said.
“So if we can reduce the size of optical components and make them into optical chips, the speed can be increased to about 1,000 times of current electronic chips,” he added.
The team’s success in going beyond the physical limitations was achieved by forming plasmonic nanolasers to overcome size limits.
However, a challenge with current plasmonic devices is that parts of the transmission mechanism gets lost as a result of the scattering which takes place within a transmission medium or from the roughness of a reflective surface.
The team’s main breakthrough lies in the association of two materials — a single InGaN/GaN core-shell nanorod on an SiO2-covered epitaxial Ag film, Lu Yu-Jung (呂宥蓉), the lead author of the research paper and a doctoral student at the university’s physics department said, adding that “one plus one equals much much bigger than two, we were lucky to accomplish the breakthrough by adding up the long-term research results from two teams.”
“The research results can be considered as a first step toward optical computing,” Gwo said, adding that while people say the end of the last century was dominated by nano-electronics, it has been predicted by scientists that nano-photonics will dominate the current century.
However, he said it will still take several years of research and experimentation before the new technology can be applied to commercial products.
Shih Chih-kang (施至剛), professor of physics at the University of Texas at Austin, said the team’s discovery is not limited to applications in the semiconductor industry, but can also contribute to other fields of science, such as improving optical microscopes used in the field of biomaterials.
Additional reporting by CNA
FAST TRACK? Chinese spouses must renounce their Chinese citizenship and pledge allegiance to Taiwan to gain citizenship, some demonstrators said Opponents and supporters of a bill that would allow Chinese spouses to obtain Taiwanese citizenship in four years instead of six staged protests near the Legislative Yuan in Taipei yesterday morning. Those who oppose the bill proposed by the Chinese Nationalist Party (KMT) demanded that Chinese spouses be granted citizenship only after renouncing their Chinese citizenship, passing a citizenship test and pledging allegiance to Taiwan. The demonstrators, who were protesting at a side entrance to the Legislative Yuan on Jinan Road, were mostly members of the Taiwan Association of University Professors and other organizations advocating Taiwanese independence. Supporters of the bill, led
SILENT MAJORITY: Only 1 percent of Chinese rejected all options but war to annex Taiwan, while one-third viewed war as unacceptable, a university study showed Many Chinese are more concerned with developments inside their country than with seeking unification with Taiwan, al-Jazeera reported on Friday. Although China claims Taiwan as its own territory and has vowed to annex it, by force if necessary, 23-year-old Chinese Shao Hongtian was quoted by al-Jazeera as saying that “hostilities are not the way to bring China and Taiwan together.” “I want unification to happen peacefully,” Shao said. Al-Jazeera said it changed Shao’s name to respect his wish for anonymity. If peaceful unification is not possible, Shao said he would prefer “things to remain as they are,” adding that many of his friends feel
Taiwan has “absolute air superiority” over China in its own airspace, Deputy Minister of National Defense Po Horng-huei (柏鴻輝) told a meeting of the legislature’s Foreign Affairs and National Defense Committee on Monday, amid concern over whether Taipei could defend itself against a military incursion by Beijing. Po made the remarks in response to a question from Democratic Progressive Party Legislator Chiu Chih-wei (邱志偉) on whether Taiwan would have partial or complete air superiority if Chinese People’s Liberation Army (PLA) warplanes were to enter Taiwan’s airspace. Po, a retired pilot, said that the Taiwanese military has “absolute air superiority” over PLA
A shipment of basil pesto imported by Costco Wholesale Taiwan from the US in the middle of last month was intercepted at the border after testing positive for excessive pesticide residue, the Food and Drug Administration (FDA) said yesterday. Samples taken from a shipment of the Kirkland Signature brand of basil pesto imported by Costco contained 0.1 milligrams per kilogram of ethylene oxide, exceeding the non-detectable limit. Ethylene oxide is a carcinogenic substance that can be used as a pesticide. The 674kg shipment of basil pesto would either be destroyed or returned to its country of origin, as is the procedure for all