By Jeffrey R. Harrow, Principal Technologist, The Harrow Group
When you were a kid, did you build a Ācrystal radioĀ? I was beyond the days of the ĀcatĀs whiskerĀ (really a thin copper-bronze wire) radio, but I still remember my amazement that a little1N34 diode and a few other things could receive radio signals like their much larger Ātube radioĀ cousins.
Things progressed, of course, through the original vacuum tube portable radios that used several odd batteries (one was 67.5 volts, if I recall), through the 1950s archetypical Āsix transistor radioĀ (more transistors were considered better, even though some manufacturers upped the transistor count by using some as diodes where needed!) to the tiny radios of today. But ĀtinyĀ is a relative term. Now we have the Āone molecule radio.Ā
IĀll Have A Radio Please; Hold the Coils, Hold the Capacitors, Hold theĀ
University of California, Berkeley professor Alex Zettl decided that even todayĀs radios were far too large and complex. So in about two weeks, he and his students created a single carbon nanotube molecule to tune and snatch radio signals out of the air and convert them to audio. This single molecule incorporates the radioĀs antenna, tuner, amplifier and demodulator! (You can see and hear the nanotube radio work here.)
Of course the point of this isnĀt to listen to the Beach Boys or Nine Inch Nails, but to form the basis for future radios that will Āchange the rulesĀ in ways more fundamental than those first pocket transistor radiosĀespecially since Zettl expects his molecule to transmit as well!
What might it mean to automation if virtually every sub-component in a machine or system could participate in a mesh network, within every device, to report its condition and allow it to tune its function based on the other sub-components around it? Could we be building truly ĀsmartĀ machines that could self-regulate and, perhaps, self-heal (by switching to redundant elements as needed, as the overall deviceĀs functionality degrades)?
What about completely new classes of devices that use wireless molecular nanotube sensors to sample various chemical, biological or environmental states virtually everywhere within a system, and have the entire ĀorganismĀ alter its operation as needed? Truly Ārule-changingĀ potential.
Ohāand the most significant issue, I believe, is that weĀre sitting here and discussing single-molecule electronic machinesānot in a Āsome dayĀ time frame, but Ātoday.Ā
ĀYes,Ā ĀNo,Ā ĀMaybe.Ā
Speaking of Āmachines,Ā why stop at molecular componentsāwhy not bend atoms themselves to our purposes? An interesting case in point is that odd thing called quantum computing.
Quantum bits, or ĀQbitsĀ have an unusual property compared to the traditional binary (1 or 0) states that we know and love. Qbits are multi-state, in that they can represent several values all at the same time, and can even share their state instantly (the speed of light being no limitation here) with other ĀentangledĀ Qbits far away! (I knowāit defies common sense, butĀ
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Labs have been playing around with Qbits for some time now, but just recently Gerhard Klimeck, professor of electrical and computer engineering at Purdue University, has created an Āexotic flat atomĀ that, as part of a specially Āengineered molecule,Ā allows a quantum state to be controlled by the physical location of an artificial atom on the moleculeĀs surface. ĀWe can control the location of the electron in this artificial atom and, therefore, control the quantum state with an externally applied electrical field.Ā Just as with our now-cumbersome transistors, being able to control a deviceĀs state allows for limitless results.
This is still very much in the lab, so donĀt hold off purchasing your next microcontroller. But it is one more example of how our beginning use of atomic and molecular building blocks, rather than our old transistor logic gates of yore, will be changing all the rules again and again.
Reaching Out And TouchingĀ
We may be getting better at working with things at the atomic and molecular levels, but weĀre still babes in the woods when it comes to interpreting and making use of the signals generated by our brains. More than a few people have (jokingly?) wished to Āplug inĀ directly to our computers and the Internet to bypass their slow fingers and senses, or especially for the disabled, to control the things around us.
We canĀt yet read minds or interpret the nuances of our brainsĀ electrical signals, but we are getting better at using the insights that we do have to make important strides.
Using electrodes implanted directly into the brain (to get around much of the ĀnoiseĀ of non-invasive connections to the skull), scientists have previously demonstrated that a person can control a cursor on a computer screen and type using an on-screen keyboard. Now, Andrew Schwartz of the University of Pittsburgh has taken this to a new level by giving a monkey sophisticated, seemingly natural, three-dimensional control of a robotic arm.
ĀTechnology ReviewĀ magazine offers a fascinating movie of the monkey using his robotic ĀarmĀ to reach out and pick up a marshmallow and then put it into his mouth. He then moves the arm and hand quite naturally so that he can lick off the sticky residue.
The potentials for this technology to empower people who have lost a limb or are suffering from paralysis are obvious, but there are many other applications for this improving technology that will change a lot of rules. For example, people could work with hazardous or dangerous objects at a distance without resorting to the cumbersome and slow ĀwaldosĀ of today. Pilots could control remotely piloted vehicles without the delay of using joysticks. Indeed, fighter pilots within planes might one day gain the competitive advantage of Āspeed of thoughtĀ control of their aircraft, which could save their lives. And donĀt forget video games...
Overall, the more we know, the more we know we need to know. DonĀt blink!