How to hide an Object Electromagnetically
Manikanta Nallagatla Mukka Sai Manish
Electronics &Communication Department Electronics &Communication Department
Indian Institute of Technology, Roorkee Indian Institute of Technology, Roorkee manikanta001nallagatla@gmail.com m.saimanish1996@gmail.com
Abstract—
Invisibility cloaks, a subject that usually occurs in science fiction and myths, have attracted wide interest recently because of their possible realization. The biggest challenge to true invisibility is known to be the cloaking of a macroscopic object in the broad range of wavelengths visible to the human eye. Here we discuss various methods of realizing the idea ‘How to hide an Object Electromagnetically’. Method1: by incorporating the principle of transformation optics into a conventional optical lens fabrication with low-cost materials and simple manufacturing techniques. Method2: to cover-up the scattering of the hidden object with the scattering of a background object so that only the scattering of the background object can be detected by an outside observer and the hidden object disappears electromagnetically. Method3: Using Active Electromagnetic cloaking.
Literature Survey:
Invisibility, which has been a long-time goal, has received many studies with transformation optics (TO), meta-materials and other methods in recent years [1-16]. Readers can get some background on this topic with some recent reviews (see e.g., [17, 18]). There are
In this primary document, Cotton Mather, a Puritan theologian, writes about his fears of losing the entire country to the devil and his minions as the Christian religion, in his mind, is being slowly eradicated from the entire country due to witchcraft. In 1693 Cotton Mather wrote a literary piece called The Wonders of the Invisible World a year after questionable events in defense of the persecutions of those accused and convicted in Salem for witchcraft.
Firstly, the protagonist explains why he is invisible. He says that it is not a physical flaw of his own, but a mistake of the “inner eye” of others. There is something flawed in the way they see the world outside themselves. The protagonist also states that there are some advantages to remaining invisible, although sometimes he doubts if he, himself, really exists. “You weren't being smart, were you, boy?" he said, not unkindly. "No, sir!" "You sure that bit about 'equality' was a mistake?” (Ellison 25). Racial equality isn't allowed in Southern discussion. The protagonist begins his story of realization at the end of his high school days, as a smart and responsible student in a southern U.S. state. After
Invisible Ink: Invisible ink was used to write secret messages, which became visible only when the papers carrying the messages were heated. Aqueous substances such as milk, vinegar and fruit juices were used to make invisible inks. This technique was used by the French Resistance during World War II. He wrote secret messages on the back of the couriers using invisible
effects of World War II. In countless cases, Japanese-American internees and American POW’s were physically and mentally dehumanized, isolated and peeled from their dignity. This caused them to feel invisible. Louie Zamperini, the main character in Unbroken by Lauren Hillenbrand, was just like the other POW’s. He was beaten, humiliated, and was not getting treated like a human being that he was. Louie was put in many POW camps throughout Japan. A young lady named Miné Okubo was a U.S. citizen. She was removed from her humble home and thrown into internment camp for simply being Japanese-American. During World War II, the Japanese-
In Chapter 10 of Newman and the article “Making Class Invisible” by Gregory Mantsios both work to explain class structures and the effects of stratification. Newman defines stratification as the ranking of entire groups of people that perpetuates unequal rewards and life chances in society (p. 281). While Newman expresses how social forces and institutions influence social class, Mantsios explains in his article how mass media perpetuates class stratification.
The reason why I chose this book is because I wanted to see what being invisible would feel like and this book gave a decent representation of what it might have felt like.
“Invisibility is the state of an object that cannot be seen” (Henderson, L., week 1, 2014). Invisibility usually involves objects. But because we cannot see it does not mean it is not there. A bachelor is not invisible, it can be seen in
By using a twister pair of wires the electromagnetic signals generated by the wires cancel each other out due to their opposite polarity.
“Setting goals is the first step in turning the invisible into the visible”(Tony Robbins). This quote from Tony relates to a 15 year old Bobby Phillips who becomes completely invisible. In this book the protagonist Bobby became invisible mentally and physically by a electric blanket. In Things Not Seen by Andrew Clements the author uses metaphors to convey the theme of invisibility. The first example of a metaphor is used by andrew clements when they are stealing information about his blanket from Sears Tower.
When this began, it was called the rainbow project. The rainbow project “ was an attempt by the United States military to create technology that would allow vessels to achieve radar-invisibility—in other words, this was an early attempt at developing what we know these days as stealth technology.” It wasn’t expected to work, but it did.
I am invisible, understand, simply because people refuse to see me. . . . That invisibility to which I refer occurs because of a peculiar disposition of the eyes of those with whom I come in contact. A matter of the construction of their inner eyes, those eyes with which they look through
However, the invisibility that Griffin viewed as power ultimately is a poison as the invisible man must sacrifice greatly for his for his power. The invisible man schemes grand dreams that can be realized through his invisibility but discovers that “no doubt invisibility made it possible to get them, but it made it impossible to enjoy them when they are got” (Wells 121). Because of his invisibility, the invisible man finds himself ostracized, in a state of danger, and no longer able to enjoy everyday customs like eating lunch at a restaurant. Griffin finds himself even unable to celebrate his discovery with others with fear of that they might steal credit for his feat or that the exposure might cause a rejection. Due to his invisible state, his “grandest ambitions are trivialized and frustrated by the very discovery that spurred those ambitions” (Beiderwell). The anger, madness, and mania that envelop the invisible man all stem from the abuse of his
The two authors, the author of Push and the author of Invisible Man, both use the metaphor of invisibility to describe their main characters, but do so in different ways. In Push,
In Invisible Man, by Ralph Ellison, it talks about how the man in the story has struggled to accept who he is, and how he is seen by other’s around him. This girl comes up to him and tells him about a terrible and evil dream she had, showing him that he can accept himself when others don’t need too. He says in the story, “I myself, after existing some twenty years, did not become alive until I discover my invisibility.” (Ellison 4) By him understanding that invisibility is not only within himself, but with those all around him, he knows that he can try to overcome it. Which is how a girl in a religious family relies on those around her.
The power of invisibility consists of being impossible to be seen or perceived by any sight sense. You might be thinking that invisibility isn't considered a colossal power, but if you behold at the bigger picture, you might just realize the potential of a power like this. Can you imagine the tons of things you could